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Control Concepts Hydrology Report Hydrology Report Control Concepts Chanhassen, MN Prepared by Loucks May 3, 2019 Loucks Project No. 17516.0C Stormwater Management Plan May 3, 2019 Control Concepts — Chanhassen Control Concepts Chanhassen, Minnesota Stormwater Management Plan Table of Contents Page Number Introduction .................................................................................................................................. 1 Methodology ................................................................................................................................ 1 Existing Conditions ....................................................................................................................... 2 Proposed Conditions .................................................................................................................... 2 Best Management Practices ......................................................................................................... 4 Conclusion .................................................................................................................................... 4 Appendices HydroCAD Report -Existing ........................................................................................ Appendix A HydroCAD Report -Proposed...................................................................................... Appendix B P8 Report ..................................................................................................................... Appendix C Figures Existing Drainage Exhibit ............................................................................................... Figure H-1 Proposed Drainage Exhibit ............................................................................................ Figure H-2 Stormwater Management Plan May 3, 2019 Control Concepts — Chanhassen Page 1 Control Concepts Chanhassen, Minnesota Stormwater Management Plan Introduction This stormwater management plan was created for the Control Concepts project located at 8077 Century Boulevard in Chanhassen, Minnesota. The total site area encompasses 5.23 acres. The project generally consists of constructing a commercial building, parking areas, retaining wall, stormwater management systems, and associated utilities. Included in this plan are calculations for the total proposed discharge offsite of stormwater from the total site area. The stormwater from the site drains to public storm sewer located in the adjacent city street and a wetland located north of the site. Ultimately, all stormwater drains to an existing wetland located to the north of the site. Requirements and Methodology City of Chanhassen and Riley Purgatory Bluff Creek Watershed District (RPBCWD) Requirements 1. Rate Control – Limit peak runoff flow rates to that from existing conditions for the 2- year, 10-year, and 100-year frequency events using a nested 24-hour rainfall distribution, and 100-year frequency, 10-day snowmelt event. 2. Volume Reduction – Provide for abstraction onsite of 1.1 inches of runoff from impervious surface of the parcel. 3. Water Quality – Sixty percent (60%) annual removal efficiency for total phosphorous and ninety percent (90%) annual removal efficiency for total suspended solids (TSS). Methodology The stormwater calculations were made utilizing the stormwater-modeling program HydroCAD 10.00. Calculations were performed for the 24-hour 100-year rainfall event of 7.18 inches, 10-year rainfall event of 4.20 inches and 2-year rainfall event of 2.84 inches based on Atlas 14 data. The 10-day snowmelt event of 7.20 inches was also analyzed. For purposes of analyzing the 5.23-acre project area, a drainage area of about 5.30 acres was included in the hydrologic analysis to account for all runoff that affects the proposed project. Soils information was found to be B soils in the area where infiltration practices will occur, based on the geotechnical report provided by Braun Intertec dated March 13, 2018. Infiltration will be utilized onsite for stormwater management at an assumed rate of 0.45 in/hr based on MPCA design infiltration rates. Stormwater Management Plan May 3, 2019 Control Concepts — Chanhassen Page 2 Existing Conditions The existing site was previously mass graded for a building pad. The site is made up of green space consisting of native grasses. The existing site is broken up into four drainage areas. Drainage Areas W, ND, and SD drain directly to Century Boulevard. Drainage Area E sheet drains to an existing wetland located north of the site. Ultimately, all public storm sewer surrounding the site drains to the existing wetland located north of the site. Overall the existing project area being analyzed contains 1.2% impervious surface area. Proposed Conditions The proposed site consists of constructing a building, surface pavements, retaining walls, underground detention system, underground infiltration system, and utilities. The proposed site contains 48% impervious surface area. The proposed project area is broken up into seven drainage areas. Drainage area W, ND, and SD drain directly to city storm sewer in Century Boulevard. Drainage area N sheet drains to an existing wetland located north of the site. Drainage area PE and B drain directly into an underground detention system. Water discharges the underground detention system to an outlet control structure consisting of a weir. Water leaves the outlet control structure and discharges into an underground infiltration system. Drainage area PW drains directly into an underground infiltration system. Water leaves the underground infiltration system and discharges to the existing wetland located north of the site. Rate Control The rate control requirements for the City of Chanhassen and Riley Purgatory Bluff Creek Watershed District are that peak rates shall not exceed existing rates for the 2, 10, and 100- year events, and the 10-day snowmelt event. Table 1.1 below compares the existing and proposed peak runoff rates and volumes for the discharge points analyzed. Table 1.1 – Peak Runoff Rates and Volumes to Century Boulevard 24-HR Storm Event Existing Peak Runoff Rate and Volume Proposed Peak Runoff Rate and Volume 2-yr (2.84”) 0.42 cfs, 0.022 ac-ft 0.17 cfs, 0.023 ac-ft 10-yr (4.20”) 0.71 cfs, 0.037 ac-ft 0.26 cfs, 0.036 ac-ft 100-yr (7.18”) 1.37 cfs, 0.073 ac-ft 0.48 cfs, 0.066 ac-ft 10-day Snowmelt (7.20”) 0.03 cfs, 0.092 ac-ft 0.02 cfs, 0.074 ac-ft Stormwater Management Plan May 3, 2019 Control Concepts — Chanhassen Page 3 Table 1.2 – Peak Runoff Rates and Volumes to Wetland 24-HR Storm Event Existing Peak Runoff Rate and Volume Proposed Peak Runoff Rate and Volume 2-yr (2.84”) 5.10 cfs, 0.487 ac-ft 2.65 cfs, 0.459 ac-ft 10-yr (4.20”) 10.17 cfs, 0.950 ac-ft 7.66 cfs, 0.972 ac-ft 100-yr (7.18”) 22.29 cfs, 2.091 ac-ft 14.03 cfs, 2.175 ac-ft 10-day Snowmelt (7.20”) 0.95 cfs, 3.096 ac-ft 0.85 cfs, 1.729 ac-ft Table 1.3 – Peak Runoff Rates and Volumes to Total 24-HR Storm Event Existing Peak Runoff Rate and Volume Proposed Peak Runoff Rate and Volume 2-yr (2.84”) 5.19 cfs, 0.509 ac-ft 2.71 cfs, 0.482 ac-ft 10-yr (4.20”) 10.32 cfs, 0.987 ac-ft 7.77 cfs, 1.008 ac-ft 100-yr (7.18”) 22.58 cfs, 2.163 ac-ft 14.26 cfs, 2.241 ac-ft 10-day Snowmelt (7.20”) 0.98 cfs, 3.188 ac-ft 0.87 cfs, 1.803 ac-ft Volume Reduction Based on the City of Chanhassen and Riley Purgatory Bluff Creek Watershed District requirements, the proposed site shall provide for abstraction onsite of 1.1 inches of runoff from impervious surface of the parcel. To meet this requirement, an underground infiltration system (INF) was designed. The required water quality volume is shown below: Required Volume (ft3) = New/Redeveloped Impervious Surfaces (ft2) * 1.1 (in) * 1/12 (ft/in) Required Volume (ft3) = 109,239 (SF) * 1.1 (in) * 1/12 (ft/in) = 10,014 ft3 The proposed water quality volume below the outlet for the underground infiltration system (INF) is 10,141 cubic-feet which meets the required volume of 10,014 cubic-feet. Water Quality Based on the City of Chanhassen and Riley Purgatory Bluff Creek Watershed District requirements, the proposed site shall remove 60% total phosphorous and 90% total suspended solids (TSS). As outlined in the methodology section, infiltration practices have been selected as the stormwater management device to meet these requirements. Calculations were conducted for all disturbed areas using P8 modeling. The overall calculated TP removals are 82.2% which exceeds the required 60% removal. The overall calculated TSS removals are 91.0% which exceeds the required 90% removal. The load reduction obtained from the proposed BMPs is shown below: Stormwater Management Plan May 3, 2019 Control Concepts — Chanhassen Page 4 Table 1.4 – P8 Load Reduction Table Variable OVERALL DET INF OFFSITE- WETLAND-HILL OFFSITE-CENTURY BLVD CURB P0% 68.2 83.2 1.1 P10% 82.2 6.7 96.2 23.2 P30% 88.2 35.6 97.8 50.2 P50% 92.1 70.3 98.6 70.8 P80% 96.1 95.9 99.7 93.7 TSS 91.0 60.9 97.7 66.3 TP 82.2 27.2 92.4 35.2 TKN 80.3 23.5 90.9 30.6 CU 85.0 44.9 91.9 49.3 PB 88.9 55.4 95.5 60.5 ZN 80.3 23.5 90.9 30.6 HC 88.9 55.4 95.5 60.5 Best Management Practices Best management practices (BMP’s) will be implemented during construction per the project Stormwater Pollution Prevention Plan (C3-2, C3-3). During construction, erosion control measures will include dust control, silt fence, inlet protection, erosion control blankets, and temporary rock construction entrances. Permanent BMP’s will include stormwater management systems, surface pavements, and turf establishment (vegetation) of disturbed areas. Conclusion The proposed Stormwater Management Plan for the Control Concepts project provides an improved solution for the conveyance of stormwater on this site. The underground infiltration system will capture runoff and provide additional water quality treatment on the site. Appendix A HydroCAD Report, Existing E ND SD W 1R Century Blvd 2R Wetland 3R Total Routing Diagram for Existing HydroCAD - 17516 Prepared by Loucks, Printed 5/2/2019 HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Subcat Reach Pond Link Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 2HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 5.252 80 >75% Grass cover, Good, HSG D (E, ND, SD, W) 0.062 98 Paved parking, HSG D (E, ND, SD, W) 5.314 80 TOTAL AREA Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 3HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 5.314 HSG D E, ND, SD, W 0.000 Other 5.314 TOTAL AREA Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 4HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 5.252 0.000 5.252 >75% Grass cover, Good E, ND, SD, W 0.000 0.000 0.000 0.062 0.000 0.062 Paved parking E, ND, SD, W 0.000 0.000 0.000 5.314 0.000 5.314 TOTAL AREA MSE 24-hr 3 2-Year Rainfall=2.84"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 5HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=5.161 ac 0.02% Impervious Runoff Depth=1.13"Subcatchment E: Flow Length=494' Tc=30.1 min CN=80/98 Runoff=5.10 cfs 0.487 af Runoff Area=0.029 ac 51.72% Impervious Runoff Depth=1.90"Subcatchment ND: Tc=7.0 min CN=80/98 Runoff=0.09 cfs 0.005 af Runoff Area=0.055 ac 72.73% Impervious Runoff Depth=2.21"Subcatchment SD: Tc=7.0 min CN=80/98 Runoff=0.19 cfs 0.010 af Runoff Area=0.069 ac 8.70% Impervious Runoff Depth=1.26"Subcatchment W: Tc=7.0 min CN=80/98 Runoff=0.15 cfs 0.007 af Inflow=0.42 cfs 0.022 afReach 1R: Century Blvd Outflow=0.42 cfs 0.022 af Inflow=5.10 cfs 0.487 afReach 2R: Wetland Outflow=5.10 cfs 0.487 af Inflow=5.19 cfs 0.509 afReach 3R: Total Outflow=5.19 cfs 0.509 af Total Runoff Area = 5.314 ac Runoff Volume = 0.509 af Average Runoff Depth = 1.15" 98.83% Pervious = 5.252 ac 1.17% Impervious = 0.062 ac MSE 24-hr 3 2-Year Rainfall=2.84"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 6HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment E: Runoff = 5.10 cfs @ 12.44 hrs, Volume= 0.487 af, Depth= 1.13" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.001 98 Paved parking, HSG D 5.160 80 >75% Grass cover, Good, HSG D 5.161 80 Weighted Average 5.160 80 99.98% Pervious Area 0.001 98 0.02% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.5 300 0.0330 0.17 Sheet Flow, Grass: Dense n= 0.240 P2= 2.90" 0.6 194 0.1190 5.17 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 30.1 494 Total Subcatchment E: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)5 4 3 2 1 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=5.161 ac Runoff Volume=0.487 af Runoff Depth=1.13" Flow Length=494' Tc=30.1 min CN=80/98 5.10 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 7HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment ND: Runoff = 0.09 cfs @ 12.14 hrs, Volume= 0.005 af, Depth= 1.90" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.015 98 Paved parking, HSG D 0.014 80 >75% Grass cover, Good, HSG D 0.029 89 Weighted Average 0.014 80 48.28% Pervious Area 0.015 98 51.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment ND: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=0.029 ac Runoff Volume=0.005 af Runoff Depth=1.90" Tc=7.0 min CN=80/98 0.09 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 8HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment SD: Runoff = 0.19 cfs @ 12.14 hrs, Volume= 0.010 af, Depth= 2.21" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.040 98 Paved parking, HSG D 0.015 80 >75% Grass cover, Good, HSG D 0.055 93 Weighted Average 0.015 80 27.27% Pervious Area 0.040 98 72.73% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment SD: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=0.055 ac Runoff Volume=0.010 af Runoff Depth=2.21" Tc=7.0 min CN=80/98 0.19 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 9HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment W: Runoff = 0.15 cfs @ 12.15 hrs, Volume= 0.007 af, Depth= 1.26" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.006 98 Paved parking, HSG D 0.063 80 >75% Grass cover, Good, HSG D 0.069 82 Weighted Average 0.063 80 91.30% Pervious Area 0.006 98 8.70% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment W: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=0.069 ac Runoff Volume=0.007 af Runoff Depth=1.26" Tc=7.0 min CN=80/98 0.15 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 10HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 1R: Century Blvd [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.153 ac, 39.87% Impervious, Inflow Depth = 1.72" for 2-Year event Inflow = 0.42 cfs @ 12.14 hrs, Volume= 0.022 af Outflow = 0.42 cfs @ 12.14 hrs, Volume= 0.022 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 1R: Century Blvd Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.153 ac 0.42 cfs0.42 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 11HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 2R: Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.161 ac, 0.02% Impervious, Inflow Depth = 1.13" for 2-Year event Inflow = 5.10 cfs @ 12.44 hrs, Volume= 0.487 af Outflow = 5.10 cfs @ 12.44 hrs, Volume= 0.487 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 2R: Wetland Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)5 4 3 2 1 0 Inflow Area=5.161 ac 5.10 cfs5.10 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 12HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 3R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.314 ac, 1.17% Impervious, Inflow Depth = 1.15" for 2-Year event Inflow = 5.19 cfs @ 12.44 hrs, Volume= 0.509 af Outflow = 5.19 cfs @ 12.44 hrs, Volume= 0.509 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 3R: Total Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)5 4 3 2 1 0 Inflow Area=5.314 ac 5.19 cfs5.19 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 13HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=5.161 ac 0.02% Impervious Runoff Depth=2.21"Subcatchment E: Flow Length=494' Tc=30.1 min CN=80/98 Runoff=10.17 cfs 0.950 af Runoff Area=0.029 ac 51.72% Impervious Runoff Depth=3.12"Subcatchment ND: Tc=7.0 min CN=80/98 Runoff=0.14 cfs 0.008 af Runoff Area=0.055 ac 72.73% Impervious Runoff Depth=3.49"Subcatchment SD: Tc=7.0 min CN=80/98 Runoff=0.29 cfs 0.016 af Runoff Area=0.069 ac 8.70% Impervious Runoff Depth=2.36"Subcatchment W: Tc=7.0 min CN=80/98 Runoff=0.28 cfs 0.014 af Inflow=0.71 cfs 0.037 afReach 1R: Century Blvd Outflow=0.71 cfs 0.037 af Inflow=10.17 cfs 0.950 afReach 2R: Wetland Outflow=10.17 cfs 0.950 af Inflow=10.32 cfs 0.987 afReach 3R: Total Outflow=10.32 cfs 0.987 af Total Runoff Area = 5.314 ac Runoff Volume = 0.987 af Average Runoff Depth = 2.23" 98.83% Pervious = 5.252 ac 1.17% Impervious = 0.062 ac MSE 24-hr 3 10-Year Rainfall=4.20"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 14HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment E: Runoff = 10.17 cfs @ 12.43 hrs, Volume= 0.950 af, Depth= 2.21" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.001 98 Paved parking, HSG D 5.160 80 >75% Grass cover, Good, HSG D 5.161 80 Weighted Average 5.160 80 99.98% Pervious Area 0.001 98 0.02% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.5 300 0.0330 0.17 Sheet Flow, Grass: Dense n= 0.240 P2= 2.90" 0.6 194 0.1190 5.17 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 30.1 494 Total Subcatchment E: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)11 10 9 8 7 6 5 4 3 2 1 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=5.161 ac Runoff Volume=0.950 af Runoff Depth=2.21" Flow Length=494' Tc=30.1 min CN=80/98 10.17 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 15HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment ND: Runoff = 0.14 cfs @ 12.14 hrs, Volume= 0.008 af, Depth= 3.12" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.015 98 Paved parking, HSG D 0.014 80 >75% Grass cover, Good, HSG D 0.029 89 Weighted Average 0.014 80 48.28% Pervious Area 0.015 98 51.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment ND: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=0.029 ac Runoff Volume=0.008 af Runoff Depth=3.12" Tc=7.0 min CN=80/98 0.14 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 16HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment SD: Runoff = 0.29 cfs @ 12.14 hrs, Volume= 0.016 af, Depth= 3.49" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.040 98 Paved parking, HSG D 0.015 80 >75% Grass cover, Good, HSG D 0.055 93 Weighted Average 0.015 80 27.27% Pervious Area 0.040 98 72.73% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment SD: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=0.055 ac Runoff Volume=0.016 af Runoff Depth=3.49" Tc=7.0 min CN=80/98 0.29 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 17HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment W: Runoff = 0.28 cfs @ 12.14 hrs, Volume= 0.014 af, Depth= 2.36" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.006 98 Paved parking, HSG D 0.063 80 >75% Grass cover, Good, HSG D 0.069 82 Weighted Average 0.063 80 91.30% Pervious Area 0.006 98 8.70% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment W: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=0.069 ac Runoff Volume=0.014 af Runoff Depth=2.36" Tc=7.0 min CN=80/98 0.28 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 18HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 1R: Century Blvd [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.153 ac, 39.87% Impervious, Inflow Depth = 2.91" for 10-Year event Inflow = 0.71 cfs @ 12.14 hrs, Volume= 0.037 af Outflow = 0.71 cfs @ 12.14 hrs, Volume= 0.037 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 1R: Century Blvd Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.153 ac 0.71 cfs0.71 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 19HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 2R: Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.161 ac, 0.02% Impervious, Inflow Depth = 2.21" for 10-Year event Inflow = 10.17 cfs @ 12.43 hrs, Volume= 0.950 af Outflow = 10.17 cfs @ 12.43 hrs, Volume= 0.950 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 2R: Wetland Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=5.161 ac 10.17 cfs10.17 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 20HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 3R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.314 ac, 1.17% Impervious, Inflow Depth = 2.23" for 10-Year event Inflow = 10.32 cfs @ 12.43 hrs, Volume= 0.987 af Outflow = 10.32 cfs @ 12.43 hrs, Volume= 0.987 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 3R: Total Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=5.314 ac 10.32 cfs10.32 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 21HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=5.161 ac 0.02% Impervious Runoff Depth=4.86"Subcatchment E: Flow Length=494' Tc=30.1 min CN=80/98 Runoff=22.29 cfs 2.091 af Runoff Area=0.029 ac 51.72% Impervious Runoff Depth=5.94"Subcatchment ND: Tc=7.0 min CN=80/98 Runoff=0.27 cfs 0.014 af Runoff Area=0.055 ac 72.73% Impervious Runoff Depth=6.37"Subcatchment SD: Tc=7.0 min CN=80/98 Runoff=0.53 cfs 0.029 af Runoff Area=0.069 ac 8.70% Impervious Runoff Depth=5.04"Subcatchment W: Tc=7.0 min CN=80/98 Runoff=0.58 cfs 0.029 af Inflow=1.37 cfs 0.073 afReach 1R: Century Blvd Outflow=1.37 cfs 0.073 af Inflow=22.29 cfs 2.091 afReach 2R: Wetland Outflow=22.29 cfs 2.091 af Inflow=22.58 cfs 2.163 afReach 3R: Total Outflow=22.58 cfs 2.163 af Total Runoff Area = 5.314 ac Runoff Volume = 2.163 af Average Runoff Depth = 4.89" 98.83% Pervious = 5.252 ac 1.17% Impervious = 0.062 ac MSE 24-hr 3 100-Year Rainfall=7.18"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 22HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment E: Runoff = 22.29 cfs @ 12.42 hrs, Volume= 2.091 af, Depth= 4.86" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.001 98 Paved parking, HSG D 5.160 80 >75% Grass cover, Good, HSG D 5.161 80 Weighted Average 5.160 80 99.98% Pervious Area 0.001 98 0.02% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.5 300 0.0330 0.17 Sheet Flow, Grass: Dense n= 0.240 P2= 2.90" 0.6 194 0.1190 5.17 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 30.1 494 Total Subcatchment E: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=5.161 ac Runoff Volume=2.091 af Runoff Depth=4.86" Flow Length=494' Tc=30.1 min CN=80/98 22.29 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 23HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment ND: Runoff = 0.27 cfs @ 12.14 hrs, Volume= 0.014 af, Depth= 5.94" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.015 98 Paved parking, HSG D 0.014 80 >75% Grass cover, Good, HSG D 0.029 89 Weighted Average 0.014 80 48.28% Pervious Area 0.015 98 51.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment ND: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=0.029 ac Runoff Volume=0.014 af Runoff Depth=5.94" Tc=7.0 min CN=80/98 0.27 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 24HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment SD: Runoff = 0.53 cfs @ 12.14 hrs, Volume= 0.029 af, Depth= 6.37" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.040 98 Paved parking, HSG D 0.015 80 >75% Grass cover, Good, HSG D 0.055 93 Weighted Average 0.015 80 27.27% Pervious Area 0.040 98 72.73% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment SD: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=0.055 ac Runoff Volume=0.029 af Runoff Depth=6.37" Tc=7.0 min CN=80/98 0.53 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 25HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment W: Runoff = 0.58 cfs @ 12.14 hrs, Volume= 0.029 af, Depth= 5.04" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.006 98 Paved parking, HSG D 0.063 80 >75% Grass cover, Good, HSG D 0.069 82 Weighted Average 0.063 80 91.30% Pervious Area 0.006 98 8.70% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment W: Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=0.069 ac Runoff Volume=0.029 af Runoff Depth=5.04" Tc=7.0 min CN=80/98 0.58 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 26HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 1R: Century Blvd [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.153 ac, 39.87% Impervious, Inflow Depth = 5.69" for 100-Year event Inflow = 1.37 cfs @ 12.14 hrs, Volume= 0.073 af Outflow = 1.37 cfs @ 12.14 hrs, Volume= 0.073 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 1R: Century Blvd Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)1 0 Inflow Area=0.153 ac 1.37 cfs1.37 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 27HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 2R: Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.161 ac, 0.02% Impervious, Inflow Depth = 4.86" for 100-Year event Inflow = 22.29 cfs @ 12.42 hrs, Volume= 2.091 af Outflow = 22.29 cfs @ 12.42 hrs, Volume= 2.091 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 2R: Wetland Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=5.161 ac 22.29 cfs22.29 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Existing HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 28HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 3R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.314 ac, 1.17% Impervious, Inflow Depth = 4.89" for 100-Year event Inflow = 22.58 cfs @ 12.42 hrs, Volume= 2.163 af Outflow = 22.58 cfs @ 12.42 hrs, Volume= 2.163 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Reach 3R: Total Inflow Outflow Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=5.314 ac 22.58 cfs22.58 cfs E ND SD W 1R Century Blvd 2R Wetland 3R Total Routing Diagram for Existing HydroCAD - 17516 (Snowmelt) Prepared by Loucks, Printed 5/2/2019 HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Subcat Reach Pond Link Existing HydroCAD - 17516 (Snowmelt) Printed 5/2/2019Prepared by Loucks Page 2HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 5.252 100 >75% Grass cover, Good, HSG D (E, ND, SD, W) 0.062 100 Paved parking, HSG D (E, ND, SD, W) 5.314 100 TOTAL AREA Existing HydroCAD - 17516 (Snowmelt) Printed 5/2/2019Prepared by Loucks Page 3HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 5.314 HSG D E, ND, SD, W 0.000 Other 5.314 TOTAL AREA Existing HydroCAD - 17516 (Snowmelt) Printed 5/2/2019Prepared by Loucks Page 4HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 5.252 0.000 5.252 >75% Grass cover, Good E, ND, SD, W 0.000 0.000 0.000 0.062 0.000 0.062 Paved parking E, ND, SD, W 0.000 0.000 0.000 5.314 0.000 5.314 TOTAL AREA Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Existing HydroCAD - 17516 (Snowme Printed 5/2/2019Prepared by Loucks Page 5HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Time span=0.00-240.00 hrs, dt=1.00 hrs, 241 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=5.161 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment E: Flow Length=494' Tc=30.1 min CN=0/100 Runoff=0.95 cfs 3.096 af Runoff Area=0.029 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment ND: Tc=7.0 min CN=0/100 Runoff=0.01 cfs 0.017 af Runoff Area=0.055 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment SD: Tc=7.0 min CN=0/100 Runoff=0.01 cfs 0.033 af Runoff Area=0.069 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment W: Tc=7.0 min CN=0/100 Runoff=0.01 cfs 0.041 af Inflow=0.03 cfs 0.092 afReach 1R: Century Blvd Outflow=0.03 cfs 0.092 af Inflow=0.95 cfs 3.096 afReach 2R: Wetland Outflow=0.95 cfs 3.096 af Inflow=0.98 cfs 3.188 afReach 3R: Total Outflow=0.98 cfs 3.188 af Total Runoff Area = 5.314 ac Runoff Volume = 3.188 af Average Runoff Depth = 7.20" 0.00% Pervious = 0.000 ac 100.00% Impervious = 5.314 ac Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Existing HydroCAD - 17516 (Snowme Printed 5/2/2019Prepared by Loucks Page 6HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment E: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.95 cfs @ 121.26 hrs, Volume= 3.096 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.001 100 Paved parking, HSG D * 5.160 100 >75% Grass cover, Good, HSG D 5.161 100 Weighted Average 5.161 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.5 300 0.0330 0.17 Sheet Flow, Grass: Dense n= 0.240 P2= 2.90" 0.6 194 0.1190 5.17 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 30.1 494 Total Subcatchment E: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)1 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=5.161 ac Runoff Volume=3.096 af Runoff Depth>7.20" Flow Length=494' Tc=30.1 min CN=0/100 0.95 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Existing HydroCAD - 17516 (Snowme Printed 5/2/2019Prepared by Loucks Page 7HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment ND: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.01 cfs @ 120.90 hrs, Volume= 0.017 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.015 100 Paved parking, HSG D * 0.014 100 >75% Grass cover, Good, HSG D 0.029 100 Weighted Average 0.029 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment ND: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.006 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0.000 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=0.029 ac Runoff Volume=0.017 af Runoff Depth>7.20" Tc=7.0 min CN=0/100 0.01 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Existing HydroCAD - 17516 (Snowme Printed 5/2/2019Prepared by Loucks Page 8HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment SD: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.01 cfs @ 120.90 hrs, Volume= 0.033 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.040 100 Paved parking, HSG D * 0.015 100 >75% Grass cover, Good, HSG D 0.055 100 Weighted Average 0.055 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment SD: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.011 0.011 0.01 0.01 0.009 0.009 0.008 0.008 0.007 0.007 0.006 0.006 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0.000 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=0.055 ac Runoff Volume=0.033 af Runoff Depth>7.20" Tc=7.0 min CN=0/100 0.01 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Existing HydroCAD - 17516 (Snowme Printed 5/2/2019Prepared by Loucks Page 9HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment W: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.01 cfs @ 120.90 hrs, Volume= 0.041 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.006 100 Paved parking, HSG D * 0.063 100 >75% Grass cover, Good, HSG D 0.069 100 Weighted Average 0.069 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment W: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.014 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=0.069 ac Runoff Volume=0.041 af Runoff Depth>7.20" Tc=7.0 min CN=0/100 0.01 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Existing HydroCAD - 17516 (Snowme Printed 5/2/2019Prepared by Loucks Page 10HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 1R: Century Blvd [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.153 ac,100.00% Impervious, Inflow Depth > 7.20" for 10-day snowmelt event Inflow = 0.03 cfs @ 120.90 hrs, Volume= 0.092 af Outflow = 0.03 cfs @ 120.90 hrs, Volume= 0.092 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Reach 1R: Century Blvd Inflow Outflow Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=0.153 ac 0.03 cfs0.03 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Existing HydroCAD - 17516 (Snowme Printed 5/2/2019Prepared by Loucks Page 11HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 2R: Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.161 ac,100.00% Impervious, Inflow Depth > 7.20" for 10-day snowmelt event Inflow = 0.95 cfs @ 121.26 hrs, Volume= 3.096 af Outflow = 0.95 cfs @ 121.26 hrs, Volume= 3.096 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Reach 2R: Wetland Inflow Outflow Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)1 0 Inflow Area=5.161 ac 0.95 cfs0.95 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Existing HydroCAD - 17516 (Snowme Printed 5/2/2019Prepared by Loucks Page 12HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 3R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.314 ac,100.00% Impervious, Inflow Depth > 7.20" for 10-day snowmelt event Inflow = 0.98 cfs @ 121.24 hrs, Volume= 3.188 af Outflow = 0.98 cfs @ 121.24 hrs, Volume= 3.188 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Reach 3R: Total Inflow Outflow Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)1 0 Inflow Area=5.314 ac 0.98 cfs0.98 cfs Appendix B HydroCAD Report, Proposed B N ND PE PWSD W 1R Century Blvd 2R Wetland 3R Total 4R Rip-Rap at Outlet Pipe DET UG Detention INF Underground Infiltration Routing Diagram for Proposed HydroCAD - 17516 Prepared by Loucks, Printed 5/2/2019 HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Subcat Reach Pond Link Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 2HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 2.722 80 >75% Grass cover, Good, HSG D (N, PE, PW, W) 1.678 98 Paved parking, HSG D (N, ND, PE, PW, SD, W) 0.914 98 Roofs, HSG D (B) 5.314 89 TOTAL AREA Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 3HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 5.314 HSG D B, N, ND, PE, PW, SD, W 0.000 Other 5.314 TOTAL AREA Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 4HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 2.722 0.000 2.722 >75% Grass cover, Good N, PE, PW, W 0.000 0.000 0.000 1.678 0.000 1.678 Paved parking N, ND, PE, PW, SD, W 0.000 0.000 0.000 0.914 0.000 0.914 Roofs B 0.000 0.000 0.000 5.314 0.000 5.314 TOTAL AREA Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 5HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Diam/Width (inches) Height (inches) Inside-Fill (inches) 1 DET 960.04 959.97 13.0 0.0054 0.013 14.0 0.0 0.0 2 INF 959.97 958.88 111.0 0.0098 0.013 18.0 0.0 0.0 MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 6HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.70 hrs, 104 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=0.914 ac 100.00% Impervious Runoff Depth=2.61"Subcatchment B: Tc=7.0 min CN=0/98 Runoff=1.46 cfs 0.199 af Runoff Area=2.391 ac 7.65% Impervious Runoff Depth=1.24"Subcatchment N: Flow Length=345' Tc=19.1 min CN=80/98 Runoff=1.72 cfs 0.248 af Runoff Area=0.029 ac 100.00% Impervious Runoff Depth=2.61"Subcatchment ND: Tc=7.0 min CN=0/98 Runoff=0.05 cfs 0.006 af Runoff Area=1.036 ac 84.75% Impervious Runoff Depth=2.38"Subcatchment PE: Tc=7.0 min CN=80/98 Runoff=1.50 cfs 0.206 af Runoff Area=0.849 ac 61.96% Impervious Runoff Depth=2.05"Subcatchment PW: Tc=7.0 min CN=80/98 Runoff=1.05 cfs 0.145 af Runoff Area=0.055 ac 100.00% Impervious Runoff Depth=2.61"Subcatchment SD: Tc=7.0 min CN=0/98 Runoff=0.09 cfs 0.012 af Runoff Area=0.040 ac 17.50% Impervious Runoff Depth=1.39"Subcatchment W: Tc=7.0 min CN=80/98 Runoff=0.03 cfs 0.005 af Inflow=0.17 cfs 0.023 afReach 1R: Century Blvd Outflow=0.17 cfs 0.023 af Inflow=2.65 cfs 0.459 afReach 2R: Wetland Outflow=2.65 cfs 0.459 af Inflow=2.71 cfs 0.482 afReach 3R: Total Outflow=2.71 cfs 0.482 af Avg. Flow Depth=0.11' Max Vel=2.17 fps Inflow=1.33 cfs 0.211 afReach 4R: Rip-Rap at Outlet Pipe n=0.040 L=8.0' S=0.1100 '/' Capacity=220.06 cfs Outflow=1.33 cfs 0.211 af Peak Elev=961.08' Storage=0.022 af Inflow=1.50 cfs 0.206 afPond DET: UG Detention Outflow=1.11 cfs 0.206 af Peak Elev=960.49' Storage=12,848 cf Inflow=3.53 cfs 0.549 afPond INF: Underground Infiltration Discarded=0.07 cfs 0.338 af Primary=1.33 cfs 0.211 af Outflow=1.39 cfs 0.550 af Total Runoff Area = 5.314 ac Runoff Volume = 0.820 af Average Runoff Depth = 1.85" 51.22% Pervious = 2.722 ac 48.78% Impervious = 2.592 ac MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 7HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment B: [49] Hint: Tc<2dt may require smaller dt Runoff = 1.46 cfs @ 11.95 hrs, Volume= 0.199 af, Depth= 2.61" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.914 98 Roofs, HSG D 0.914 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment B: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)1 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=0.914 ac Runoff Volume=0.199 af Runoff Depth=2.61" Tc=7.0 min CN=0/98 1.46 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 8HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment N: [49] Hint: Tc<2dt may require smaller dt Runoff = 1.72 cfs @ 12.54 hrs, Volume= 0.248 af, Depth= 1.24" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.183 98 Paved parking, HSG D 2.208 80 >75% Grass cover, Good, HSG D 2.391 81 Weighted Average 2.208 80 92.35% Pervious Area 0.183 98 7.65% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 300 0.1008 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 2.90" 0.2 45 0.0667 3.87 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 19.1 345 Total Subcatchment N: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)1 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=2.391 ac Runoff Volume=0.248 af Runoff Depth=1.24" Flow Length=345' Tc=19.1 min CN=80/98 1.72 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 9HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment ND: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.05 cfs @ 11.95 hrs, Volume= 0.006 af, Depth= 2.61" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.029 98 Paved parking, HSG D 0.000 80 >75% Grass cover, Good, HSG D 0.029 98 Weighted Average 0.029 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment ND: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.05 0.048 0.046 0.044 0.042 0.04 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=0.029 ac Runoff Volume=0.006 af Runoff Depth=2.61" Tc=7.0 min CN=0/98 0.05 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 10HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment PE: [49] Hint: Tc<2dt may require smaller dt Runoff = 1.50 cfs @ 11.96 hrs, Volume= 0.206 af, Depth= 2.38" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.878 98 Paved parking, HSG D 0.158 80 >75% Grass cover, Good, HSG D 1.036 95 Weighted Average 0.158 80 15.25% Pervious Area 0.878 98 84.75% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment PE: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)1 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=1.036 ac Runoff Volume=0.206 af Runoff Depth=2.38" Tc=7.0 min CN=80/98 1.50 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 11HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment PW: [49] Hint: Tc<2dt may require smaller dt Runoff = 1.05 cfs @ 11.97 hrs, Volume= 0.145 af, Depth= 2.05" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.526 98 Paved parking, HSG D 0.323 80 >75% Grass cover, Good, HSG D 0.849 91 Weighted Average 0.323 80 38.04% Pervious Area 0.526 98 61.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment PW: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)1 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=0.849 ac Runoff Volume=0.145 af Runoff Depth=2.05" Tc=7.0 min CN=80/98 1.05 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 12HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment SD: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.09 cfs @ 11.95 hrs, Volume= 0.012 af, Depth= 2.61" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.055 98 Paved parking, HSG D 0.000 80 >75% Grass cover, Good, HSG D 0.055 98 Weighted Average 0.055 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment SD: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=0.055 ac Runoff Volume=0.012 af Runoff Depth=2.61" Tc=7.0 min CN=0/98 0.09 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 13HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment W: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.03 cfs @ 12.01 hrs, Volume= 0.005 af, Depth= 1.39" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 2-Year Rainfall=2.84" Area (ac) CN Description 0.007 98 Paved parking, HSG D 0.033 80 >75% Grass cover, Good, HSG D 0.040 83 Weighted Average 0.033 80 82.50% Pervious Area 0.007 98 17.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment W: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 MSE 24-hr 3 2-Year Rainfall=2.84" Runoff Area=0.040 ac Runoff Volume=0.005 af Runoff Depth=1.39" Tc=7.0 min CN=80/98 0.03 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 14HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 1R: Century Blvd [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.124 ac, 73.39% Impervious, Inflow Depth = 2.22" for 2-Year event Inflow = 0.17 cfs @ 11.97 hrs, Volume= 0.023 af Outflow = 0.17 cfs @ 11.97 hrs, Volume= 0.023 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Reach 1R: Century Blvd Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.124 ac 0.17 cfs0.17 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 15HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 2R: Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.190 ac, 48.19% Impervious, Inflow Depth = 1.06" for 2-Year event Inflow = 2.65 cfs @ 12.72 hrs, Volume= 0.459 af Outflow = 2.65 cfs @ 12.72 hrs, Volume= 0.459 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Reach 2R: Wetland Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)2 1 0 Inflow Area=5.190 ac 2.65 cfs2.65 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 16HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 3R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.314 ac, 48.78% Impervious, Inflow Depth = 1.09" for 2-Year event Inflow = 2.71 cfs @ 12.70 hrs, Volume= 0.482 af Outflow = 2.71 cfs @ 12.70 hrs, Volume= 0.482 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Reach 3R: Total Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)3 2 1 0 Inflow Area=5.314 ac 2.71 cfs2.71 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 17HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 4R: Rip-Rap at Outlet Pipe Inflow Area = 2.799 ac, 82.82% Impervious, Inflow Depth = 0.91" for 2-Year event Inflow = 1.33 cfs @ 13.16 hrs, Volume= 0.211 af Outflow = 1.33 cfs @ 13.16 hrs, Volume= 0.211 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Max. Velocity= 2.17 fps, Min. Travel Time= 0.1 min Avg. Velocity = 1.01 fps, Avg. Travel Time= 0.1 min Peak Storage= 5 cf @ 13.15 hrs Average Depth at Peak Storage= 0.11' Bank-Full Depth= 1.00' Flow Area= 27.5 sf, Capacity= 220.06 cfs 2.50' x 1.00' deep channel, n= 0.040 Earth, cobble bottom, clean sides Side Slope Z-value= 25.0 '/' Top Width= 52.50' Length= 8.0' Slope= 0.1100 '/' Inlet Invert= 958.88', Outlet Invert= 958.00' ‡ Reach 4R: Rip-Rap at Outlet Pipe Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)1 0 Inflow Area=2.799 ac Avg. Flow Depth=0.11' Max Vel=2.17 fps n=0.040 L=8.0' S=0.1100 '/' Capacity=220.06 cfs 1.33 cfs1.33 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 18HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Pond DET: UG Detention [87] Warning: Oscillations may require smaller dt or Finer Routing (severity=1) Inflow Area = 1.036 ac, 84.75% Impervious, Inflow Depth = 2.38" for 2-Year event Inflow = 1.50 cfs @ 11.96 hrs, Volume= 0.206 af Outflow = 1.11 cfs @ 12.30 hrs, Volume= 0.206 af, Atten= 26%, Lag= 20.5 min Primary = 1.11 cfs @ 12.30 hrs, Volume= 0.206 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Peak Elev= 961.08' @ 12.34 hrs Surf.Area= 0.031 ac Storage= 0.022 af Plug-Flow detention time= 16.0 min calculated for 0.204 af (99% of inflow) Center-of-Mass det. time= 16.1 min ( 773.3 - 757.2 ) Volume Invert Avail.Storage Storage Description #1 960.04' 0.128 af 54.0" Round Pipe Storage L= 350.0' Device Routing Invert Outlet Devices #1 Primary 960.04'14.0" Round Culvert L= 13.0' Ke= 0.500 Inlet / Outlet Invert= 960.04' / 959.97' S= 0.0054 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.07 sf #2 Device 1 960.04'6.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=1.01 cfs @ 12.30 hrs HW=961.00' TW=959.94' (Dynamic Tailwater) 1=Culvert (Passes 1.01 cfs of 2.34 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.01 cfs @ 4.05 fps) MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 19HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pond DET: UG Detention Inflow Primary Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)1 0 Inflow Area=1.036 ac Peak Elev=961.08' Storage=0.022 af 1.50 cfs 1.11 cfs MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 20HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Pond INF: Underground Infiltration Inflow Area = 2.799 ac, 82.82% Impervious, Inflow Depth = 2.36" for 2-Year event Inflow = 3.53 cfs @ 12.02 hrs, Volume= 0.549 af Outflow = 1.39 cfs @ 13.16 hrs, Volume= 0.550 af, Atten= 61%, Lag= 68.5 min Discarded = 0.07 cfs @ 9.10 hrs, Volume= 0.338 af Primary = 1.33 cfs @ 13.16 hrs, Volume= 0.211 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Peak Elev= 960.49' @ 13.14 hrs Surf.Area= 6,339 sf Storage= 12,848 cf Plug-Flow detention time= 876.6 min calculated for 0.545 af (99% of inflow) Center-of-Mass det. time= 894.0 min ( 1,657.8 - 763.9 ) Volume Invert Avail.Storage Storage Description #1A 957.67' 6,119 cf 29.98'W x 211.42'L x 4.42'H Field A 27,997 cf Overall - 12,701 cf Embedded = 15,296 cf x 40.0% Voids #2A 958.17' 12,696 cf CMP Arch 53x41 x 50 Inside #1 Effective Size= 53.0"W x 41.0"H => 12.06 sf x 20.00'L = 241.1 cf Overall Size= 53.0"W x 41.0"H x 20.00'L Row Length Adjustment= +5.00' x 12.06 sf x 5 rows 27.98' Header x 12.06 sf x 1 = 337.4 cf Inside 18,815 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 959.97'18.0" Round Culvert L= 111.0' Ke= 0.500 Inlet / Outlet Invert= 959.97' / 958.88' S= 0.0098 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Discarded 957.67'0.450 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.07 cfs @ 9.10 hrs HW=957.75' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.07 cfs) Primary OutFlow Max=1.22 cfs @ 13.16 hrs HW=960.47' TW=958.99' (Dynamic Tailwater) 1=Culvert (Inlet Controls 1.22 cfs @ 2.40 fps) MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 21HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pond INF: Underground Infiltration - Chamber Wizard Field A Chamber Model = CMP Arch 53x41 (1/2" Corrugated Pipe Arch, AISI Handbook 1994, Table 2.18) Effective Size= 53.0"W x 41.0"H => 12.06 sf x 20.00'L = 241.1 cf Overall Size= 53.0"W x 41.0"H x 20.00'L Row Length Adjustment= +5.00' x 12.06 sf x 5 rows 53.0" Wide + 17.7" Spacing = 70.7" C-C Row Spacing 10 Chambers/Row x 20.00' Long +5.00' Row Adjustment +4.42' Header x 1 = 209.42' Row Length +12.0" End Stone x 2 = 211.42' Base Length 5 Rows x 53.0" Wide + 17.7" Spacing x 4 + 12.0" Side Stone x 2 = 29.98' Base Width 6.0" Base + 41.0" Chamber Height + 6.0" Cover = 4.42' Field Height 50 Chambers x 241.1 cf +5.00' Row Adjustment x 12.06 sf x 5 Rows + 27.98' Header x 12.06 sf = 12,696.0 cf Chamber Storage 27,997.1 cf Field - 12,696.0 cf Chambers = 15,301.2 cf Stone x 40.0% Voids = 6,120.5 cf Stone Storage Chamber Storage + Stone Storage = 18,816.5 cf = 0.432 af Overall Storage Efficiency = 67.2% Overall System Size = 211.42' x 29.98' x 4.42' 50 Chambers 1,036.9 cy Field 566.7 cy Stone MSE 24-hr 3 2-Year Rainfall=2.84"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 22HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pond INF: Underground Infiltration Inflow Outflow Discarded Primary Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)3 2 1 0 Inflow Area=2.799 ac Peak Elev=960.49' Storage=12,848 cf 3.53 cfs 1.39 cfs 0.07 cfs 1.33 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 23HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.70 hrs, 104 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=0.914 ac 100.00% Impervious Runoff Depth=3.96"Subcatchment B: Tc=7.0 min CN=0/98 Runoff=2.18 cfs 0.302 af Runoff Area=2.391 ac 7.65% Impervious Runoff Depth=2.34"Subcatchment N: Flow Length=345' Tc=19.1 min CN=80/98 Runoff=3.19 cfs 0.467 af Runoff Area=0.029 ac 100.00% Impervious Runoff Depth=3.96"Subcatchment ND: Tc=7.0 min CN=0/98 Runoff=0.07 cfs 0.010 af Runoff Area=1.036 ac 84.75% Impervious Runoff Depth=3.70"Subcatchment PE: Tc=7.0 min CN=80/98 Runoff=2.31 cfs 0.319 af Runoff Area=0.849 ac 61.96% Impervious Runoff Depth=3.30"Subcatchment PW: Tc=7.0 min CN=80/98 Runoff=1.70 cfs 0.233 af Runoff Area=0.055 ac 100.00% Impervious Runoff Depth=3.96"Subcatchment SD: Tc=7.0 min CN=0/98 Runoff=0.13 cfs 0.018 af Runoff Area=0.040 ac 17.50% Impervious Runoff Depth=2.52"Subcatchment W: Tc=7.0 min CN=80/98 Runoff=0.06 cfs 0.008 af Inflow=0.26 cfs 0.036 afReach 1R: Century Blvd Outflow=0.26 cfs 0.036 af Inflow=7.66 cfs 0.972 afReach 2R: Wetland Outflow=7.66 cfs 0.972 af Inflow=7.77 cfs 1.008 afReach 3R: Total Outflow=7.77 cfs 1.008 af Avg. Flow Depth=0.20' Max Vel=3.00 fps Inflow=4.54 cfs 0.505 afReach 4R: Rip-Rap at Outlet Pipe n=0.040 L=8.0' S=0.1100 '/' Capacity=220.06 cfs Outflow=4.53 cfs 0.505 af Peak Elev=961.84' Storage=0.048 af Inflow=2.31 cfs 0.319 afPond DET: UG Detention Outflow=1.55 cfs 0.319 af Peak Elev=961.02' Storage=15,360 cf Inflow=5.25 cfs 0.854 afPond INF: Underground Infiltration Discarded=0.07 cfs 0.351 af Primary=4.54 cfs 0.505 af Outflow=4.61 cfs 0.856 af Total Runoff Area = 5.314 ac Runoff Volume = 1.357 af Average Runoff Depth = 3.06" 51.22% Pervious = 2.722 ac 48.78% Impervious = 2.592 ac MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 24HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment B: [49] Hint: Tc<2dt may require smaller dt Runoff = 2.18 cfs @ 11.95 hrs, Volume= 0.302 af, Depth= 3.96" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.914 98 Roofs, HSG D 0.914 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment B: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)2 1 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=0.914 ac Runoff Volume=0.302 af Runoff Depth=3.96" Tc=7.0 min CN=0/98 2.18 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 25HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment N: [49] Hint: Tc<2dt may require smaller dt Runoff = 3.19 cfs @ 12.50 hrs, Volume= 0.467 af, Depth= 2.34" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.183 98 Paved parking, HSG D 2.208 80 >75% Grass cover, Good, HSG D 2.391 81 Weighted Average 2.208 80 92.35% Pervious Area 0.183 98 7.65% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 300 0.1008 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 2.90" 0.2 45 0.0667 3.87 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 19.1 345 Total Subcatchment N: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)3 2 1 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=2.391 ac Runoff Volume=0.467 af Runoff Depth=2.34" Flow Length=345' Tc=19.1 min CN=80/98 3.19 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 26HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment ND: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.07 cfs @ 11.95 hrs, Volume= 0.010 af, Depth= 3.96" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.029 98 Paved parking, HSG D 0.000 80 >75% Grass cover, Good, HSG D 0.029 98 Weighted Average 0.029 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment ND: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=0.029 ac Runoff Volume=0.010 af Runoff Depth=3.96" Tc=7.0 min CN=0/98 0.07 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 27HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment PE: [49] Hint: Tc<2dt may require smaller dt Runoff = 2.31 cfs @ 11.96 hrs, Volume= 0.319 af, Depth= 3.70" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.878 98 Paved parking, HSG D 0.158 80 >75% Grass cover, Good, HSG D 1.036 95 Weighted Average 0.158 80 15.25% Pervious Area 0.878 98 84.75% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment PE: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)2 1 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=1.036 ac Runoff Volume=0.319 af Runoff Depth=3.70" Tc=7.0 min CN=80/98 2.31 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 28HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment PW: [49] Hint: Tc<2dt may require smaller dt Runoff = 1.70 cfs @ 11.97 hrs, Volume= 0.233 af, Depth= 3.30" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.526 98 Paved parking, HSG D 0.323 80 >75% Grass cover, Good, HSG D 0.849 91 Weighted Average 0.323 80 38.04% Pervious Area 0.526 98 61.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment PW: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)1 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=0.849 ac Runoff Volume=0.233 af Runoff Depth=3.30" Tc=7.0 min CN=80/98 1.70 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 29HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment SD: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.13 cfs @ 11.95 hrs, Volume= 0.018 af, Depth= 3.96" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.055 98 Paved parking, HSG D 0.000 80 >75% Grass cover, Good, HSG D 0.055 98 Weighted Average 0.055 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment SD: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=0.055 ac Runoff Volume=0.018 af Runoff Depth=3.96" Tc=7.0 min CN=0/98 0.13 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 30HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment W: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.06 cfs @ 11.99 hrs, Volume= 0.008 af, Depth= 2.52" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 10-Year Rainfall=4.20" Area (ac) CN Description 0.007 98 Paved parking, HSG D 0.033 80 >75% Grass cover, Good, HSG D 0.040 83 Weighted Average 0.033 80 82.50% Pervious Area 0.007 98 17.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment W: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 MSE 24-hr 3 10-Year Rainfall=4.20" Runoff Area=0.040 ac Runoff Volume=0.008 af Runoff Depth=2.52" Tc=7.0 min CN=80/98 0.06 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 31HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 1R: Century Blvd [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.124 ac, 73.39% Impervious, Inflow Depth = 3.50" for 10-Year event Inflow = 0.26 cfs @ 11.96 hrs, Volume= 0.036 af Outflow = 0.26 cfs @ 11.96 hrs, Volume= 0.036 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Reach 1R: Century Blvd Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.124 ac 0.26 cfs0.26 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 32HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 2R: Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.190 ac, 48.19% Impervious, Inflow Depth = 2.25" for 10-Year event Inflow = 7.66 cfs @ 12.61 hrs, Volume= 0.972 af Outflow = 7.66 cfs @ 12.61 hrs, Volume= 0.972 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Reach 2R: Wetland Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)8 7 6 5 4 3 2 1 0 Inflow Area=5.190 ac 7.66 cfs7.66 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 33HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 3R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.314 ac, 48.78% Impervious, Inflow Depth = 2.28" for 10-Year event Inflow = 7.77 cfs @ 12.60 hrs, Volume= 1.008 af Outflow = 7.77 cfs @ 12.60 hrs, Volume= 1.008 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Reach 3R: Total Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)8 7 6 5 4 3 2 1 0 Inflow Area=5.314 ac 7.77 cfs7.77 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 34HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 4R: Rip-Rap at Outlet Pipe Inflow Area = 2.799 ac, 82.82% Impervious, Inflow Depth = 2.16" for 10-Year event Inflow = 4.54 cfs @ 12.66 hrs, Volume= 0.505 af Outflow = 4.53 cfs @ 12.66 hrs, Volume= 0.505 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Max. Velocity= 3.00 fps, Min. Travel Time= 0.0 min Avg. Velocity = 1.23 fps, Avg. Travel Time= 0.1 min Peak Storage= 12 cf @ 12.68 hrs Average Depth at Peak Storage= 0.20' Bank-Full Depth= 1.00' Flow Area= 27.5 sf, Capacity= 220.06 cfs 2.50' x 1.00' deep channel, n= 0.040 Earth, cobble bottom, clean sides Side Slope Z-value= 25.0 '/' Top Width= 52.50' Length= 8.0' Slope= 0.1100 '/' Inlet Invert= 958.88', Outlet Invert= 958.00' ‡ Reach 4R: Rip-Rap at Outlet Pipe Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)5 4 3 2 1 0 Inflow Area=2.799 ac Avg. Flow Depth=0.20' Max Vel=3.00 fps n=0.040 L=8.0' S=0.1100 '/' Capacity=220.06 cfs 4.54 cfs4.53 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 35HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Pond DET: UG Detention Inflow Area = 1.036 ac, 84.75% Impervious, Inflow Depth = 3.70" for 10-Year event Inflow = 2.31 cfs @ 11.96 hrs, Volume= 0.319 af Outflow = 1.55 cfs @ 12.36 hrs, Volume= 0.319 af, Atten= 33%, Lag= 24.1 min Primary = 1.55 cfs @ 12.36 hrs, Volume= 0.319 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Peak Elev= 961.84' @ 12.50 hrs Surf.Area= 0.035 ac Storage= 0.048 af Plug-Flow detention time= 20.5 min calculated for 0.316 af (99% of inflow) Center-of-Mass det. time= 20.6 min ( 772.1 - 751.5 ) Volume Invert Avail.Storage Storage Description #1 960.04' 0.128 af 54.0" Round Pipe Storage L= 350.0' Device Routing Invert Outlet Devices #1 Primary 960.04'14.0" Round Culvert L= 13.0' Ke= 0.500 Inlet / Outlet Invert= 960.04' / 959.97' S= 0.0054 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.07 sf #2 Device 1 960.04'6.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=1.20 cfs @ 12.36 hrs HW=961.70' TW=960.71' (Dynamic Tailwater) 1=Culvert (Passes 1.20 cfs of 4.77 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.20 cfs @ 4.80 fps) Pond DET: UG Detention Inflow Primary Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)2 1 0 Inflow Area=1.036 ac Peak Elev=961.84' Storage=0.048 af 2.31 cfs 1.55 cfs MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 36HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Pond INF: Underground Infiltration Inflow Area = 2.799 ac, 82.82% Impervious, Inflow Depth = 3.66" for 10-Year event Inflow = 5.25 cfs @ 12.02 hrs, Volume= 0.854 af Outflow = 4.61 cfs @ 12.66 hrs, Volume= 0.856 af, Atten= 12%, Lag= 38.5 min Discarded = 0.07 cfs @ 7.00 hrs, Volume= 0.351 af Primary = 4.54 cfs @ 12.66 hrs, Volume= 0.505 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Peak Elev= 961.02' @ 12.69 hrs Surf.Area= 6,339 sf Storage= 15,360 cf Plug-Flow detention time= 589.3 min calculated for 0.847 af (99% of inflow) Center-of-Mass det. time= 610.0 min ( 1,369.8 - 759.9 ) Volume Invert Avail.Storage Storage Description #1A 957.67' 6,119 cf 29.98'W x 211.42'L x 4.42'H Field A 27,997 cf Overall - 12,701 cf Embedded = 15,296 cf x 40.0% Voids #2A 958.17' 12,696 cf CMP Arch 53x41 x 50 Inside #1 Effective Size= 53.0"W x 41.0"H => 12.06 sf x 20.00'L = 241.1 cf Overall Size= 53.0"W x 41.0"H x 20.00'L Row Length Adjustment= +5.00' x 12.06 sf x 5 rows 27.98' Header x 12.06 sf x 1 = 337.4 cf Inside 18,815 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 959.97'18.0" Round Culvert L= 111.0' Ke= 0.500 Inlet / Outlet Invert= 959.97' / 958.88' S= 0.0098 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Discarded 957.67'0.450 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.07 cfs @ 7.00 hrs HW=957.75' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.07 cfs) Primary OutFlow Max=4.23 cfs @ 12.66 hrs HW=960.97' TW=959.07' (Dynamic Tailwater) 1=Culvert (Inlet Controls 4.23 cfs @ 3.40 fps) MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 37HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pond INF: Underground Infiltration - Chamber Wizard Field A Chamber Model = CMP Arch 53x41 (1/2" Corrugated Pipe Arch, AISI Handbook 1994, Table 2.18) Effective Size= 53.0"W x 41.0"H => 12.06 sf x 20.00'L = 241.1 cf Overall Size= 53.0"W x 41.0"H x 20.00'L Row Length Adjustment= +5.00' x 12.06 sf x 5 rows 53.0" Wide + 17.7" Spacing = 70.7" C-C Row Spacing 10 Chambers/Row x 20.00' Long +5.00' Row Adjustment +4.42' Header x 1 = 209.42' Row Length +12.0" End Stone x 2 = 211.42' Base Length 5 Rows x 53.0" Wide + 17.7" Spacing x 4 + 12.0" Side Stone x 2 = 29.98' Base Width 6.0" Base + 41.0" Chamber Height + 6.0" Cover = 4.42' Field Height 50 Chambers x 241.1 cf +5.00' Row Adjustment x 12.06 sf x 5 Rows + 27.98' Header x 12.06 sf = 12,696.0 cf Chamber Storage 27,997.1 cf Field - 12,696.0 cf Chambers = 15,301.2 cf Stone x 40.0% Voids = 6,120.5 cf Stone Storage Chamber Storage + Stone Storage = 18,816.5 cf = 0.432 af Overall Storage Efficiency = 67.2% Overall System Size = 211.42' x 29.98' x 4.42' 50 Chambers 1,036.9 cy Field 566.7 cy Stone MSE 24-hr 3 10-Year Rainfall=4.20"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 38HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pond INF: Underground Infiltration Inflow Outflow Discarded Primary Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)5 4 3 2 1 0 Inflow Area=2.799 ac Peak Elev=961.02' Storage=15,360 cf 5.25 cfs 4.61 cfs 0.07 cfs 4.54 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 39HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.70 hrs, 104 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=0.914 ac 100.00% Impervious Runoff Depth=6.94"Subcatchment B: Tc=7.0 min CN=0/98 Runoff=3.76 cfs 0.529 af Runoff Area=2.391 ac 7.65% Impervious Runoff Depth=5.02"Subcatchment N: Flow Length=345' Tc=19.1 min CN=80/98 Runoff=6.60 cfs 1.000 af Runoff Area=0.029 ac 100.00% Impervious Runoff Depth=6.94"Subcatchment ND: Tc=7.0 min CN=0/98 Runoff=0.12 cfs 0.017 af Runoff Area=1.036 ac 84.75% Impervious Runoff Depth=6.62"Subcatchment PE: Tc=7.0 min CN=80/98 Runoff=4.10 cfs 0.572 af Runoff Area=0.849 ac 61.96% Impervious Runoff Depth=6.15"Subcatchment PW: Tc=7.0 min CN=80/98 Runoff=3.17 cfs 0.435 af Runoff Area=0.055 ac 100.00% Impervious Runoff Depth=6.94"Subcatchment SD: Tc=7.0 min CN=0/98 Runoff=0.23 cfs 0.032 af Runoff Area=0.040 ac 17.50% Impervious Runoff Depth=5.22"Subcatchment W: Tc=7.0 min CN=80/98 Runoff=0.13 cfs 0.017 af Inflow=0.48 cfs 0.066 afReach 1R: Century Blvd Outflow=0.48 cfs 0.066 af Inflow=14.03 cfs 2.175 afReach 2R: Wetland Outflow=14.03 cfs 2.175 af Inflow=14.26 cfs 2.241 afReach 3R: Total Outflow=14.26 cfs 2.241 af Avg. Flow Depth=0.25' Max Vel=3.40 fps Inflow=7.43 cfs 1.175 afReach 4R: Rip-Rap at Outlet Pipe n=0.040 L=8.0' S=0.1100 '/' Capacity=220.06 cfs Outflow=7.44 cfs 1.175 af Peak Elev=964.28' Storage=0.125 af Inflow=4.10 cfs 0.572 afPond DET: UG Detention Outflow=2.18 cfs 0.572 af Peak Elev=961.47' Storage=17,192 cf Inflow=8.85 cfs 1.536 afPond INF: Underground Infiltration Discarded=0.07 cfs 0.362 af Primary=7.43 cfs 1.175 af Outflow=7.50 cfs 1.537 af Total Runoff Area = 5.314 ac Runoff Volume = 2.602 af Average Runoff Depth = 5.88" 51.22% Pervious = 2.722 ac 48.78% Impervious = 2.592 ac MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 40HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment B: [49] Hint: Tc<2dt may require smaller dt Runoff = 3.76 cfs @ 11.95 hrs, Volume= 0.529 af, Depth= 6.94" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.914 98 Roofs, HSG D 0.914 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment B: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)4 3 2 1 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=0.914 ac Runoff Volume=0.529 af Runoff Depth=6.94" Tc=7.0 min CN=0/98 3.76 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 41HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment N: [49] Hint: Tc<2dt may require smaller dt Runoff = 6.60 cfs @ 12.47 hrs, Volume= 1.000 af, Depth= 5.02" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.183 98 Paved parking, HSG D 2.208 80 >75% Grass cover, Good, HSG D 2.391 81 Weighted Average 2.208 80 92.35% Pervious Area 0.183 98 7.65% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 300 0.1008 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 2.90" 0.2 45 0.0667 3.87 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 19.1 345 Total Subcatchment N: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)7 6 5 4 3 2 1 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=2.391 ac Runoff Volume=1.000 af Runoff Depth=5.02" Flow Length=345' Tc=19.1 min CN=80/98 6.60 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 42HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment ND: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.12 cfs @ 11.95 hrs, Volume= 0.017 af, Depth= 6.94" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.029 98 Paved parking, HSG D 0.000 80 >75% Grass cover, Good, HSG D 0.029 98 Weighted Average 0.029 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment ND: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=0.029 ac Runoff Volume=0.017 af Runoff Depth=6.94" Tc=7.0 min CN=0/98 0.12 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 43HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment PE: [49] Hint: Tc<2dt may require smaller dt Runoff = 4.10 cfs @ 11.96 hrs, Volume= 0.572 af, Depth= 6.62" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.878 98 Paved parking, HSG D 0.158 80 >75% Grass cover, Good, HSG D 1.036 95 Weighted Average 0.158 80 15.25% Pervious Area 0.878 98 84.75% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment PE: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)4 3 2 1 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=1.036 ac Runoff Volume=0.572 af Runoff Depth=6.62" Tc=7.0 min CN=80/98 4.10 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 44HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment PW: [49] Hint: Tc<2dt may require smaller dt Runoff = 3.17 cfs @ 11.96 hrs, Volume= 0.435 af, Depth= 6.15" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.526 98 Paved parking, HSG D 0.323 80 >75% Grass cover, Good, HSG D 0.849 91 Weighted Average 0.323 80 38.04% Pervious Area 0.526 98 61.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment PW: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)3 2 1 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=0.849 ac Runoff Volume=0.435 af Runoff Depth=6.15" Tc=7.0 min CN=80/98 3.17 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 45HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment SD: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.23 cfs @ 11.95 hrs, Volume= 0.032 af, Depth= 6.94" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.055 98 Paved parking, HSG D 0.000 80 >75% Grass cover, Good, HSG D 0.055 98 Weighted Average 0.055 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment SD: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=0.055 ac Runoff Volume=0.032 af Runoff Depth=6.94" Tc=7.0 min CN=0/98 0.23 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 46HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment W: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.13 cfs @ 11.98 hrs, Volume= 0.017 af, Depth= 5.22" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.10 hrs, dt= 0.70 hrs MSE 24-hr 3 100-Year Rainfall=7.18" Area (ac) CN Description 0.007 98 Paved parking, HSG D 0.033 80 >75% Grass cover, Good, HSG D 0.040 83 Weighted Average 0.033 80 82.50% Pervious Area 0.007 98 17.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment W: Runoff Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 MSE 24-hr 3 100-Year Rainfall=7.18" Runoff Area=0.040 ac Runoff Volume=0.017 af Runoff Depth=5.22" Tc=7.0 min CN=80/98 0.13 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 47HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 1R: Century Blvd [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.124 ac, 73.39% Impervious, Inflow Depth = 6.39" for 100-Year event Inflow = 0.48 cfs @ 11.96 hrs, Volume= 0.066 af Outflow = 0.48 cfs @ 11.96 hrs, Volume= 0.066 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Reach 1R: Century Blvd Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.124 ac 0.48 cfs0.48 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 48HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 2R: Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.190 ac, 48.19% Impervious, Inflow Depth = 5.03" for 100-Year event Inflow = 14.03 cfs @ 12.48 hrs, Volume= 2.175 af Outflow = 14.03 cfs @ 12.48 hrs, Volume= 2.175 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Reach 2R: Wetland Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=5.190 ac 14.03 cfs14.03 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 49HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 3R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.314 ac, 48.78% Impervious, Inflow Depth = 5.06" for 100-Year event Inflow = 14.26 cfs @ 12.47 hrs, Volume= 2.241 af Outflow = 14.26 cfs @ 12.47 hrs, Volume= 2.241 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Reach 3R: Total Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=5.314 ac 14.26 cfs14.26 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 50HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 4R: Rip-Rap at Outlet Pipe [90] Warning: Qout>Qin may require smaller dt or Finer Routing Inflow Area = 2.799 ac, 82.82% Impervious, Inflow Depth = 5.04" for 100-Year event Inflow = 7.43 cfs @ 12.48 hrs, Volume= 1.175 af Outflow = 7.44 cfs @ 12.48 hrs, Volume= 1.175 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Max. Velocity= 3.40 fps, Min. Travel Time= 0.0 min Avg. Velocity = 1.50 fps, Avg. Travel Time= 0.1 min Peak Storage= 18 cf @ 12.47 hrs Average Depth at Peak Storage= 0.25' Bank-Full Depth= 1.00' Flow Area= 27.5 sf, Capacity= 220.06 cfs 2.50' x 1.00' deep channel, n= 0.040 Earth, cobble bottom, clean sides Side Slope Z-value= 25.0 '/' Top Width= 52.50' Length= 8.0' Slope= 0.1100 '/' Inlet Invert= 958.88', Outlet Invert= 958.00' ‡ Reach 4R: Rip-Rap at Outlet Pipe Inflow Outflow Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)8 7 6 5 4 3 2 1 0 Inflow Area=2.799 ac Avg. Flow Depth=0.25' Max Vel=3.40 fps n=0.040 L=8.0' S=0.1100 '/' Capacity=220.06 cfs 7.43 cfs7.44 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 51HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Pond DET: UG Detention Inflow Area = 1.036 ac, 84.75% Impervious, Inflow Depth = 6.62" for 100-Year event Inflow = 4.10 cfs @ 11.96 hrs, Volume= 0.572 af Outflow = 2.18 cfs @ 12.46 hrs, Volume= 0.572 af, Atten= 47%, Lag= 30.4 min Primary = 2.18 cfs @ 12.46 hrs, Volume= 0.572 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Peak Elev= 964.28' @ 12.63 hrs Surf.Area= 0.017 ac Storage= 0.125 af Plug-Flow detention time= 28.6 min calculated for 0.566 af (99% of inflow) Center-of-Mass det. time= 28.5 min ( 773.4 - 744.9 ) Volume Invert Avail.Storage Storage Description #1 960.04' 0.128 af 54.0" Round Pipe Storage L= 350.0' Device Routing Invert Outlet Devices #1 Primary 960.04'14.0" Round Culvert L= 13.0' Ke= 0.500 Inlet / Outlet Invert= 960.04' / 959.97' S= 0.0054 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.07 sf #2 Device 1 960.04'6.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=1.93 cfs @ 12.46 hrs HW=963.95' TW=961.38' (Dynamic Tailwater) 1=Culvert (Passes 1.93 cfs of 8.25 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.93 cfs @ 7.72 fps) Pond DET: UG Detention Inflow Primary Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)4 3 2 1 0 Inflow Area=1.036 ac Peak Elev=964.28' Storage=0.125 af 4.10 cfs 2.18 cfs MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 52HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Pond INF: Underground Infiltration Inflow Area = 2.799 ac, 82.82% Impervious, Inflow Depth = 6.58" for 100-Year event Inflow = 8.85 cfs @ 12.00 hrs, Volume= 1.536 af Outflow = 7.50 cfs @ 12.48 hrs, Volume= 1.537 af, Atten= 15%, Lag= 28.9 min Discarded = 0.07 cfs @ 4.90 hrs, Volume= 0.362 af Primary = 7.43 cfs @ 12.48 hrs, Volume= 1.175 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.10 hrs, dt= 0.70 hrs Peak Elev= 961.47' @ 12.49 hrs Surf.Area= 6,339 sf Storage= 17,192 cf Plug-Flow detention time= 345.1 min calculated for 1.522 af (99% of inflow) Center-of-Mass det. time= 368.0 min ( 1,124.2 - 756.2 ) Volume Invert Avail.Storage Storage Description #1A 957.67' 6,119 cf 29.98'W x 211.42'L x 4.42'H Field A 27,997 cf Overall - 12,701 cf Embedded = 15,296 cf x 40.0% Voids #2A 958.17' 12,696 cf CMP Arch 53x41 x 50 Inside #1 Effective Size= 53.0"W x 41.0"H => 12.06 sf x 20.00'L = 241.1 cf Overall Size= 53.0"W x 41.0"H x 20.00'L Row Length Adjustment= +5.00' x 12.06 sf x 5 rows 27.98' Header x 12.06 sf x 1 = 337.4 cf Inside 18,815 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 959.97'18.0" Round Culvert L= 111.0' Ke= 0.500 Inlet / Outlet Invert= 959.97' / 958.88' S= 0.0098 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Discarded 957.67'0.450 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.07 cfs @ 4.90 hrs HW=957.78' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.07 cfs) Primary OutFlow Max=7.03 cfs @ 12.48 hrs HW=961.39' TW=959.12' (Dynamic Tailwater) 1=Culvert (Inlet Controls 7.03 cfs @ 4.06 fps) MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 53HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pond INF: Underground Infiltration - Chamber Wizard Field A Chamber Model = CMP Arch 53x41 (1/2" Corrugated Pipe Arch, AISI Handbook 1994, Table 2.18) Effective Size= 53.0"W x 41.0"H => 12.06 sf x 20.00'L = 241.1 cf Overall Size= 53.0"W x 41.0"H x 20.00'L Row Length Adjustment= +5.00' x 12.06 sf x 5 rows 53.0" Wide + 17.7" Spacing = 70.7" C-C Row Spacing 10 Chambers/Row x 20.00' Long +5.00' Row Adjustment +4.42' Header x 1 = 209.42' Row Length +12.0" End Stone x 2 = 211.42' Base Length 5 Rows x 53.0" Wide + 17.7" Spacing x 4 + 12.0" Side Stone x 2 = 29.98' Base Width 6.0" Base + 41.0" Chamber Height + 6.0" Cover = 4.42' Field Height 50 Chambers x 241.1 cf +5.00' Row Adjustment x 12.06 sf x 5 Rows + 27.98' Header x 12.06 sf = 12,696.0 cf Chamber Storage 27,997.1 cf Field - 12,696.0 cf Chambers = 15,301.2 cf Stone x 40.0% Voids = 6,120.5 cf Stone Storage Chamber Storage + Stone Storage = 18,816.5 cf = 0.432 af Overall Storage Efficiency = 67.2% Overall System Size = 211.42' x 29.98' x 4.42' 50 Chambers 1,036.9 cy Field 566.7 cy Stone MSE 24-hr 3 100-Year Rainfall=7.18"Proposed HydroCAD - 17516 Printed 5/2/2019Prepared by Loucks Page 54HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pond INF: Underground Infiltration Inflow Outflow Discarded Primary Hydrograph Time (hours) 7065605550454035302520151050Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=2.799 ac Peak Elev=961.47' Storage=17,192 cf 8.85 cfs 7.50 cfs 0.07 cfs 7.43 cfs B N ND PE PWSD W 1R Century Blvd 2R Wetland 3R Total 4R Rip-Rap at Outlet Pipe DET UG Detention INF Underground Infiltration Routing Diagram for Proposed HydroCAD - 17516 (Snowmelt) Prepared by Loucks, Printed 5/2/2019 HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Subcat Reach Pond Link Proposed HydroCAD - 17516 (Snowmelt) Printed 5/2/2019Prepared by Loucks Page 2HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 2.722 100 >75% Grass cover, Good, HSG D (N, PE, PW, W) 1.678 100 Paved parking, HSG D (N, ND, PE, PW, SD, W) 0.914 100 Roofs, HSG D (B) 5.314 100 TOTAL AREA Proposed HydroCAD - 17516 (Snowmelt) Printed 5/2/2019Prepared by Loucks Page 3HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 5.314 HSG D B, N, ND, PE, PW, SD, W 0.000 Other 5.314 TOTAL AREA Proposed HydroCAD - 17516 (Snowmelt) Printed 5/2/2019Prepared by Loucks Page 4HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 2.722 0.000 2.722 >75% Grass cover, Good N, PE, PW, W 0.000 0.000 0.000 1.678 0.000 1.678 Paved parking N, ND, PE, PW, SD, W 0.000 0.000 0.000 0.914 0.000 0.914 Roofs B 0.000 0.000 0.000 5.314 0.000 5.314 TOTAL AREA Proposed HydroCAD - 17516 (Snowmelt) Printed 5/2/2019Prepared by Loucks Page 5HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Diam/Width (inches) Height (inches) Inside-Fill (inches) 1 DET 960.04 959.97 13.0 0.0054 0.013 14.0 0.0 0.0 2 INF 959.97 958.88 111.0 0.0098 0.013 18.0 0.0 0.0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 6HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Time span=0.00-240.00 hrs, dt=1.00 hrs, 241 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=0.914 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment B: Tc=7.0 min CN=0/100 Runoff=0.17 cfs 0.548 af Runoff Area=2.391 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment N: Flow Length=345' Tc=19.1 min CN=0/100 Runoff=0.45 cfs 1.435 af Runoff Area=0.029 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment ND: Tc=7.0 min CN=0/100 Runoff=0.01 cfs 0.017 af Runoff Area=1.036 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment PE: Tc=7.0 min CN=0/100 Runoff=0.19 cfs 0.622 af Runoff Area=0.849 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment PW: Tc=7.0 min CN=0/100 Runoff=0.16 cfs 0.509 af Runoff Area=0.055 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment SD: Tc=7.0 min CN=0/100 Runoff=0.01 cfs 0.033 af Runoff Area=0.040 ac 100.00% Impervious Runoff Depth>7.20"Subcatchment W: Tc=7.0 min CN=0/100 Runoff=0.01 cfs 0.024 af Inflow=0.02 cfs 0.074 afReach 1R: Century Blvd Outflow=0.02 cfs 0.074 af Inflow=0.85 cfs 1.729 afReach 2R: Wetland Outflow=0.85 cfs 1.729 af Inflow=0.87 cfs 1.803 afReach 3R: Total Outflow=0.87 cfs 1.803 af Avg. Flow Depth=0.07' Max Vel=1.60 fps Inflow=0.43 cfs 0.294 afReach 4R: Rip-Rap at Outlet Pipe n=0.040 L=8.0' S=0.1100 '/' Capacity=220.06 cfs Outflow=0.43 cfs 0.294 af Peak Elev=960.31' Storage=0.003 af Inflow=0.19 cfs 0.622 afPond DET: UG Detention Outflow=0.19 cfs 0.621 af Peak Elev=960.26' Storage=11,648 cf Inflow=0.52 cfs 1.679 afPond INF: Underground Infiltration Discarded=0.07 cfs 1.235 af Primary=0.43 cfs 0.294 af Outflow=0.50 cfs 1.529 af Total Runoff Area = 5.314 ac Runoff Volume = 3.188 af Average Runoff Depth = 7.20" 0.00% Pervious = 0.000 ac 100.00% Impervious = 5.314 ac Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 7HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment B: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.17 cfs @ 120.90 hrs, Volume= 0.548 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.914 100 Roofs, HSG D 0.914 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment B: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=0.914 ac Runoff Volume=0.548 af Runoff Depth>7.20" Tc=7.0 min CN=0/100 0.17 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 8HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment N: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.45 cfs @ 121.05 hrs, Volume= 1.435 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.183 100 Paved parking, HSG D * 2.208 100 >75% Grass cover, Good, HSG D 2.391 100 Weighted Average 2.391 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.9 300 0.1008 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 2.90" 0.2 45 0.0667 3.87 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 19.1 345 Total Subcatchment N: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=2.391 ac Runoff Volume=1.435 af Runoff Depth>7.20" Flow Length=345' Tc=19.1 min CN=0/100 0.45 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 9HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment ND: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.01 cfs @ 120.90 hrs, Volume= 0.017 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.029 100 Paved parking, HSG D * 0.000 100 >75% Grass cover, Good, HSG D 0.029 100 Weighted Average 0.029 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment ND: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.006 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0.000 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=0.029 ac Runoff Volume=0.017 af Runoff Depth>7.20" Tc=7.0 min CN=0/100 0.01 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 10HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment PE: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.19 cfs @ 120.90 hrs, Volume= 0.622 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.878 100 Paved parking, HSG D * 0.158 100 >75% Grass cover, Good, HSG D 1.036 100 Weighted Average 1.036 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment PE: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=1.036 ac Runoff Volume=0.622 af Runoff Depth>7.20" Tc=7.0 min CN=0/100 0.19 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 11HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment PW: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.16 cfs @ 120.90 hrs, Volume= 0.509 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.526 100 Paved parking, HSG D * 0.323 100 >75% Grass cover, Good, HSG D 0.849 100 Weighted Average 0.849 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment PW: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=0.849 ac Runoff Volume=0.509 af Runoff Depth>7.20" Tc=7.0 min CN=0/100 0.16 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 12HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment SD: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.01 cfs @ 120.90 hrs, Volume= 0.033 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.055 100 Paved parking, HSG D * 0.000 100 >75% Grass cover, Good, HSG D 0.055 100 Weighted Average 0.055 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment SD: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.011 0.011 0.01 0.01 0.009 0.009 0.008 0.008 0.007 0.007 0.006 0.006 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0.000 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=0.055 ac Runoff Volume=0.033 af Runoff Depth>7.20" Tc=7.0 min CN=0/100 0.01 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 13HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment W: [49] Hint: Tc<2dt may require smaller dt Runoff = 0.01 cfs @ 120.90 hrs, Volume= 0.024 af, Depth> 7.20" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Area (ac) CN Description * 0.007 100 Paved parking, HSG D * 0.033 100 >75% Grass cover, Good, HSG D 0.040 100 Weighted Average 0.040 100 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment W: Runoff Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.008 0.007 0.007 0.006 0.006 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0.000 0 Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20" Runoff Area=0.040 ac Runoff Volume=0.024 af Runoff Depth>7.20" Tc=7.0 min CN=0/100 0.01 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 14HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 1R: Century Blvd [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.124 ac,100.00% Impervious, Inflow Depth > 7.20" for 10-day snowmelt event Inflow = 0.02 cfs @ 120.90 hrs, Volume= 0.074 af Outflow = 0.02 cfs @ 120.90 hrs, Volume= 0.074 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Reach 1R: Century Blvd Inflow Outflow Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=0.124 ac 0.02 cfs0.02 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 15HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 2R: Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.190 ac,100.00% Impervious, Inflow Depth > 4.00" for 10-day snowmelt event Inflow = 0.85 cfs @ 121.94 hrs, Volume= 1.729 af Outflow = 0.85 cfs @ 121.94 hrs, Volume= 1.729 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Reach 2R: Wetland Inflow Outflow Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=5.190 ac 0.85 cfs0.85 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 16HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 3R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.314 ac,100.00% Impervious, Inflow Depth > 4.07" for 10-day snowmelt event Inflow = 0.87 cfs @ 121.92 hrs, Volume= 1.803 af Outflow = 0.87 cfs @ 121.92 hrs, Volume= 1.803 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Reach 3R: Total Inflow Outflow Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=5.314 ac 0.87 cfs0.87 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 17HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Reach 4R: Rip-Rap at Outlet Pipe Inflow Area = 2.799 ac,100.00% Impervious, Inflow Depth = 1.26" for 10-day snowmelt event Inflow = 0.43 cfs @ 122.18 hrs, Volume= 0.294 af Outflow = 0.43 cfs @ 122.18 hrs, Volume= 0.294 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Max. Velocity= 1.60 fps, Min. Travel Time= 0.1 min Avg. Velocity = 0.76 fps, Avg. Travel Time= 0.2 min Peak Storage= 2 cf @ 122.19 hrs Average Depth at Peak Storage= 0.07' Bank-Full Depth= 1.00' Flow Area= 27.5 sf, Capacity= 220.06 cfs 2.50' x 1.00' deep channel, n= 0.040 Earth, cobble bottom, clean sides Side Slope Z-value= 25.0 '/' Top Width= 52.50' Length= 8.0' Slope= 0.1100 '/' Inlet Invert= 958.88', Outlet Invert= 958.00' ‡ Reach 4R: Rip-Rap at Outlet Pipe Inflow Outflow Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=2.799 ac Avg. Flow Depth=0.07' Max Vel=1.60 fps n=0.040 L=8.0' S=0.1100 '/' Capacity=220.06 cfs 0.43 cfs0.43 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 18HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Pond DET: UG Detention Inflow Area = 1.036 ac,100.00% Impervious, Inflow Depth > 7.20" for 10-day snowmelt event Inflow = 0.19 cfs @ 120.90 hrs, Volume= 0.622 af Outflow = 0.19 cfs @ 120.84 hrs, Volume= 0.621 af, Atten= 1%, Lag= 0.0 min Primary = 0.19 cfs @ 120.84 hrs, Volume= 0.621 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Peak Elev= 960.31' @ 122.79 hrs Surf.Area= 0.017 ac Storage= 0.003 af Plug-Flow detention time= 16.6 min calculated for 0.621 af (100% of inflow) Center-of-Mass det. time= 13.6 min ( 7,202.6 - 7,189.0 ) Volume Invert Avail.Storage Storage Description #1 960.04' 0.128 af 54.0" Round Pipe Storage L= 350.0' Device Routing Invert Outlet Devices #1 Primary 960.04'14.0" Round Culvert L= 13.0' Ke= 0.500 Inlet / Outlet Invert= 960.04' / 959.97' S= 0.0054 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.07 sf #2 Device 1 960.04'6.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=0.16 cfs @ 120.84 hrs HW=960.28' TW=960.18' (Dynamic Tailwater) 1=Culvert (Passes 0.16 cfs of 0.17 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.16 cfs @ 1.34 fps) Pond DET: UG Detention Inflow Primary Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=1.036 ac Peak Elev=960.31' Storage=0.003 af 0.19 cfs0.19 cfs Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 19HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Summary for Pond INF: Underground Infiltration Inflow Area = 2.799 ac,100.00% Impervious, Inflow Depth > 7.20" for 10-day snowmelt event Inflow = 0.52 cfs @ 120.88 hrs, Volume= 1.679 af Outflow = 0.50 cfs @ 122.18 hrs, Volume= 1.529 af, Atten= 5%, Lag= 78.0 min Discarded = 0.07 cfs @ 76.00 hrs, Volume= 1.235 af Primary = 0.43 cfs @ 122.18 hrs, Volume= 0.294 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-240.00 hrs, dt= 1.00 hrs Peak Elev= 960.26' @ 122.19 hrs Surf.Area= 6,339 sf Storage= 11,648 cf Plug-Flow detention time= 1,025.0 min calculated for 1.529 af (91% of inflow) Center-of-Mass det. time= 441.3 min ( 7,635.3 - 7,194.0 ) Volume Invert Avail.Storage Storage Description #1A 957.67' 6,119 cf 29.98'W x 211.42'L x 4.42'H Field A 27,997 cf Overall - 12,701 cf Embedded = 15,296 cf x 40.0% Voids #2A 958.17' 12,696 cf CMP Arch 53x41 x 50 Inside #1 Effective Size= 53.0"W x 41.0"H => 12.06 sf x 20.00'L = 241.1 cf Overall Size= 53.0"W x 41.0"H x 20.00'L Row Length Adjustment= +5.00' x 12.06 sf x 5 rows 27.98' Header x 12.06 sf x 1 = 337.4 cf Inside 18,815 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 959.97'18.0" Round Culvert L= 111.0' Ke= 0.500 Inlet / Outlet Invert= 959.97' / 958.88' S= 0.0098 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Discarded 957.67'0.450 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.07 cfs @ 76.00 hrs HW=957.72' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.07 cfs) Primary OutFlow Max=0.42 cfs @ 122.18 hrs HW=960.25' TW=958.94' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.42 cfs @ 1.81 fps) Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 20HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pond INF: Underground Infiltration - Chamber Wizard Field A Chamber Model = CMP Arch 53x41 (1/2" Corrugated Pipe Arch, AISI Handbook 1994, Table 2.18) Effective Size= 53.0"W x 41.0"H => 12.06 sf x 20.00'L = 241.1 cf Overall Size= 53.0"W x 41.0"H x 20.00'L Row Length Adjustment= +5.00' x 12.06 sf x 5 rows 53.0" Wide + 17.7" Spacing = 70.7" C-C Row Spacing 10 Chambers/Row x 20.00' Long +5.00' Row Adjustment +4.42' Header x 1 = 209.42' Row Length +12.0" End Stone x 2 = 211.42' Base Length 5 Rows x 53.0" Wide + 17.7" Spacing x 4 + 12.0" Side Stone x 2 = 29.98' Base Width 6.0" Base + 41.0" Chamber Height + 6.0" Cover = 4.42' Field Height 50 Chambers x 241.1 cf +5.00' Row Adjustment x 12.06 sf x 5 Rows + 27.98' Header x 12.06 sf = 12,696.0 cf Chamber Storage 27,997.1 cf Field - 12,696.0 cf Chambers = 15,301.2 cf Stone x 40.0% Voids = 6,120.5 cf Stone Storage Chamber Storage + Stone Storage = 18,816.5 cf = 0.432 af Overall Storage Efficiency = 67.2% Overall System Size = 211.42' x 29.98' x 4.42' 50 Chambers 1,036.9 cy Field 566.7 cy Stone Snowmelt_10d_100yr 10-day snowmelt Rainfall=7.20"Proposed HydroCAD - 17516 (Snowm Printed 5/2/2019Prepared by Loucks Page 21HydroCAD® 10.00-20 s/n 02676 © 2017 HydroCAD Software Solutions LLC Pond INF: Underground Infiltration Inflow Outflow Discarded Primary Hydrograph Time (hours) 2402302202102001901801701601501401301201101009080706050403020100Flow (cfs)0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=2.799 ac Peak Elev=960.26' Storage=11,648 cf 0.52 cfs 0.50 cfs 0.07 cfs 0.43 cfs Appendix C P8 Report P8 Urban Catchment Model, Version 3.5 Run Date 05/03/19 Case ControlConcepts.p8c FirstDate 12/31/06 Precip(in) 285.3 Title Control Concepts LastDate 12/31/16 Rain(in) 258.06 PrecFile Msp4916.pcp Events 738 Snow(in) 27.24 PartFile nurp50.p8p TotalHrs 86448 TotalYrs 9.86 Case Title Control Concepts Case Data File ControlConcepts.p8c Path W:\2017\17516\HYDROLOGY\P8\ Case Notes: Storm Data File Msp4916.pcp Particle File nurp50.p8p Air Temp File File Msp4916.tem Time Steps Per Hour 48 Minimum Inter-Event Time (hrs) 10 Maximum Continuity Error % 2 Rainfall Breakpoint (inches) 0.8 Precipitation Scale Factor 1 Air Temp Offset (deg-F) 0 Loops Thru Storm File 1 Simulation Dates Start 12/31/2006 Keep 1/1/9999 Stop 12/31/2016 Max Snowfall Temperature (deg-f) 32.0 SnowMelt Temperature (deg-f) 32.0 Snowmelt Coef (in/degF-Day) 0.06 Soil Freeze Temp (deg-F) 32.0 Snowmelt Abstraction Factor 1.00 Evapo-Trans. Calibration Factor 1.00 Growing Season Start Month 5 Growing Season End Month 10 5-Day Antecedent Rainfall + Runoff (inches) CN Antecedent Moisture Condition AMC-II AMC-III Growing Season 1.40 2.10 NonGrowing Season 0.50 1.10 Watershed Data Watershed Name N PE B PW ND W SD Runoff to Device OFFSITE-WETLAND-DET DET INF E-CENTURY BLVE-CENTURY BLVE-CENTURY BLV Infiltration to Device Watershed Area 2.391 1.036 0.914 0.849 0.028 0.03 0.046 SCS Curve Number (Pervious) 80 80 80 80 80 80 80 Scale Factor for Pervious Runoff Load 1 1 1 1111 Indirectly Connected Imperv Fraction 0 0 0 0000 UnSwept Impervious Fraction 0.076 0.8475 1 0.6196 1 0.175 1 UnSwept Depression Storage (inches) 0.02 0.02 0.02 0.02 0.02 0.02 0.02 UnSwept Imperv. Runoff Coefficient 1 1 1 1111 UnSwept Scale Factor for Particle Loads 1 1 1 1111 Swept Impervious Fraction 0 0 0 0000 Swept Depression Storage (inches) 0.02 0.02 0.02 0.02 0.02 0.02 0.02 Swept Imperv. Runoff Coefficient 1 1 1 1111 Swept Scale Factor for Particle Loads 1 1 1 1111 Sweeping Frequency 0 0.5 0.5 0.5 0.5 0.5 0.5 simple startup case di (t d) Sweeping Efficiency 1 1 1 1111 Sweeping Start Date (MMDD) 101 101 101 101 101 101 101 Sweeping Stop Date (MMDD) 1231 1231 1231 1231 1231 1231 1231 Device Data Device Name DET INF FSITE-WETLAND-HE-CENTURY BLVD CURB Device Type POND POND SWALE PIPE Infiltration Outlet Normal Outlet INF Spillway Outlet Particle Removal Scale Factor 1 1 1 Bottom Elevation (ft) 960.04 958.17 945 Bottom Area (acres) 0.036 0.146 Permanent Pool Area (acres) 0 0.146 Permanent Pool Volume (ac-ft) 0 0.233 Perm Pool Infilt Rate (in/hr) 0 0.45 Flood Pool Area (acres) 0.036 0.146 Flood Pool Volume (ac-ft) 0.128 0.157 Flood Pool Infilt Rate (in/hr) 0 0 0.06 Infilt Basin Void Fraction (%) Detention Pond Outlet Parameters Outlet Type ORIFICE ORIFICE Outlet Orifice Diameter (in) 6 18 Orifice Discharge Coef 1 0.5 Outlet Weir Length (ft) Weir Discharge Coef Perforated Riser Height (ft) Number of Holes in Riser Holes Diameter Flood Pool Drain Time (hrs) Swale Parameters Length of Flow Path (ft) 50 Slope of Flow Path %30 Bottom Width (ft)100 Side Slope (ft-v/ft-h)1 Maximum Depth of Flow (ft) 1 Mannings n Constant 0.1 Hydraulic Model 0 Pipe, Splitter, Aquifer Parameter Hydraulic Res. Time (hrs)0 Particle Data Particle File nurp50.p8p Particle Class P0% P10% P30% P50% P80% Filtration Efficiency (%) 90 100 100 100 100 Settling Velocity (ft/hr) 0 0.03 0.3 1.5 15 First Order Decay Rate (1/day) 0 0 0 0 0 2nd Order Decay (1/day-ppm) 0 0 0 0 0 Impervious Runoff Conc (ppm) 1 0 0 0 0 Pervious Runoff Conc (ppm) 1 100 100 100 200 Pervious Conc Exponent 0 1 1 1 1 Accum. Rate (lbs-ac-day) 0 1.75 1.75 1.75 3.5 Particle Removal Rate (1/day) 0 0.25 0.25 0.25 0.25 Washoff Coefficient 0 20 20 20 20 Washoff Exponent 0 2 2 2 2 Sweeper Efficiency 0 0 0 5 15 Water Quality Component Data Component Name TSS TP TKN CU PB ZN HC Water Quality Criteria (ppm) Level 1 5 0.025 2 2 0.02 5 0.1 Level 2 10 0.05 1 0.0048 0.014 0.0362 0.5 Level 3 20 0.1 0.5 0.02 0.15 0.38 1 Content Scale Factor 1 1 1 1 1 1 1 Particle Composition (mg/kg) P0% 0 99000 600000 13600 2000 64000 250000 P10% 1000000 3850 15000 340 180 1600 22500 P30% 1000000 3850 15000 340 180 1600 22500 P50% 1000000 3850 15000 340 180 1600 22500 P80% 1000000 0 0 340 180 0 22500 Figures Existing Drainage Exhibit Proposed Drainage Exhibit 5.161 AC (0.001 IMP) E0.070 AC (0.006 IMP) W 444444444 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 44444440.055 AC (0.040 IMP) SD 0.029 AC (0.015 IMP) ND LOUCKS W:\2017\17516\HYDROLOGY\CADD\01 Existing Drainage Areas - 17516Plotted: 05 /02 / 2019 12:0 AM7200 Hemlock Lane, Suite 300 Maple Grove, MN 55369 763.424.5505 www.loucksinc.com PLANNING CIVIL ENGINEERING LAND SURVEYING LANDSCAPE ARCHITECTURE ENVIRONMENTAL CADD files prepared by the Consultant for this project are instruments of the Consultant professional services for use solely with respect to this project. These CADD files shall not be used on other projects, for additions to this project, or for completion of this project by others without written approval by the Consultant. With the Consultant's approval, others may be permitted to obtain copies of the CADD drawing files for information and reference only. All intentional or unintentional revisions, additions, or deletions to these CADD files shall be made at the full risk of that party making such revisions, additions or deletions and that party shall hold harmless and indemnify the Consultant from any & all responsibilities, claims, and liabilities. CADD QUALIFICATION SUBMITTAL/REVISIONS PROFESSIONAL SIGNATURE QUALITY CONTROL CONTROL CONCEPTS 8077 CENTURY BOULEVARD CHANHASSEN, MN CONTROL CONCEPTS LEGEND X X SUBCATCHMENT POND TOP OF POND TIME OF CONCENTRATION PATH SITE DISCHARGE 4 4 4 4 4 4 4 4 4 N EXISTING DRAINAGE AREAS H-1 PROPOSED BUILDING FFE = 971.40NOPARKINGNOPARKING8 8 88 88888881 2 RETAINING WALL ELEVATIONS TW-65.33 BW-64.50 TW-64.53 BW-61.53 TW-58.00 BW-58.00 1 2 3 MATCH EXISTING 3 0.914 AC (0.914 IMP) B 2.391 AC (0.183 IMP) N 1.036 AC (0.878 IMP) PE 0.849 AC (0.526 IMP) PW 0.055 AC (0.055 IMP) SD 0.040 AC (0.007 IMP) W 0.029 AC (0.029 IMP) ND 4444444444 4 4 444444444444LOUCKS W:\2017\17516\HYDROLOGY\CADD\02 Proposed Drainage Areas - 17516Plotted: 05 /02 / 2019 1:26 PM7200 Hemlock Lane, Suite 300 Maple Grove, MN 55369 763.424.5505 www.loucksinc.com PLANNING CIVIL ENGINEERING LAND SURVEYING LANDSCAPE ARCHITECTURE ENVIRONMENTAL CADD files prepared by the Consultant for this project are instruments of the Consultant professional services for use solely with respect to this project. These CADD files shall not be used on other projects, for additions to this project, or for completion of this project by others without written approval by the Consultant. With the Consultant's approval, others may be permitted to obtain copies of the CADD drawing files for information and reference only. All intentional or unintentional revisions, additions, or deletions to these CADD files shall be made at the full risk of that party making such revisions, additions or deletions and that party shall hold harmless and indemnify the Consultant from any & all responsibilities, claims, and liabilities. CADD QUALIFICATION SUBMITTAL/REVISIONS PROFESSIONAL SIGNATURE QUALITY CONTROL CONTROL CONCEPTS 8077 CENTURY BOULEVARD CHANHASSEN, MN CONTROL CONCEPTS LEGEND X X SUBCATCHMENT POND TOP OF POND TIME OF CONCENTRATION PATH SITE DISCHARGE 4 4 4 4 4 4 4 4 4 N PROPOSED DRAINAGE AREAS H-2