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Arbor Glen Stormwater Report 05162017 Stormwater Management Report for Arbor Glen Chanhassen, Minnesota Prepared on Revised on June 5, 2015 November 19, 2015 July 26, 2016 September 13, 2016 April 21, 2017 May 16, 2017 Prepared for Arbor Glen Chanhassen, LLC 3360 Bavaria Rd Chaska, MN 55318 Prepared by Sathre-Bergquist, Inc. 150 South Broadway Wayzata, MN 55371 Contact(s): Dan Schmidt, P.E. schmidt@sathre.com (phone) (952) 476-6000 (fax) (952) 476-0104 http://www.sathre.com/ I hereby certify that this report was prepared by me or under my direct supervision and that I am a duly registered Professional Engineer under the laws of the State of Minnesota. __________________________ Date______________ Reg. No.____________ May 16, 2017 Summary We are proposing an 18 unit small lot subdivision in the Riley Purgatory Bluff Creek Watershed district and the City of Chanhassen. Our primary BMP for this project is Storm Water Harvest and Reuse for Irrigation. We have hired Water In Motion to do the detailed Storm Water Harvest and Reuse Plan. Their plan is attached at the back of the Storm Water Report. Total Suspended Solids and Phosphorous Removal We modeled our storm water system using the MIDS program written for the MPCA by Barr Engineering. Please see the calculations in the Storm Water Quality and Quantity Management plan prepared by Sathre Bergquist, Inc. I have tabulated our results below. lbs/yr TSS TP TSS% Removal Ph% Removal Existing Load 806 2.44 Proposed Load 75 0.22 91% 91% Rate Control We are using the storm water pond to harvest the rainfall and use it irrigation on site. The irrigation system will draw the pond down to an elevation of 890. As the storm water reaches the pond, the irrigation will be drawing the pond down. We were able to reach the desired post development rate for the 2 year, 10 year, and 100 year runoff. See Below: 2-yr (cfs) 10-yr (cfs) 100-yr (cfs) Snow Melt (cfs) Pre-Development Rate 4.5 11.77 29.38 0.8 Post-Development Rate 3.0 11.65 27.76 0.8 SS AATTHH RREE --BB EERRGG QQ UUII SS TT,, II NN CC .. 11 55 00 SS OO UU TT HH BB RR OO AA DD WW AA YY,, WW AA YY ZZ AA TT AA ,, MM II NN NN EE SS OO TT AA ,, 55 55 33 99 11 TEL:(952)476-6000 FAX:(952)476-0104 WEB :WWW.SATHRE.COM – 2 – May 16, 2017 We did not model the Snow melt because it will not be able to be reached by using Storm Water Reuse as our primary Best Management Practice. We feel that the benefits of a Storm Water Harvest BMP far outweigh the negatives of not meeting the Snow Melt Storm Water Event. Rate Control We have calculated the amount of storm water abstraction required for 1.1” of rainfall over 6,7950 sf of hardcover to be 6,189 cf of storm water. According to Water In Motion’s calculations, we can disperse 9,942 cf (74,380 gallons) on our site within 48 hours. See WIM calculations. This is just a brief summary of our calculations. Please contact me if you have any additional questions or comments. Thanks, Daniel Schmidt, PE Project: Arbor Glen Location: Chanhassen MN Prepared for: Chanhassen Prepared by: Sathre-Bergquist, Inc. Date: June 4, 2015 Revised: September 13, 2016 Revised: 05/16/2017 Stormwater Management Rules 3.1a Rate Control: 3.1b Volume Control: 3.1c Phosphorus and TSS Control 3.5 Buffer Credit 3.6 Low-floor elevation ABSTRACTION REQUIRED: Required Infiltration - 1.1 inch = 0.092 ft Hardcover -67,518 sf Abstraction Volume Required (AV) = 67,518 sf x 0.092 ft = 6,189 cf 0.14 Ac-Ft ABSTRACTION ACHIEVED: Water Harvesting AV = 0.16 Ac-Ft 6,800.00 cf within 48 hours 9,942.00 cf within 48 hours from WIM Calcs lbs/yr TSS TP TSS% Removal Ph% Removal Existing Load 806 2.44 Proposed Load 75 0.22 91% 91% Rate Control from the pond was achieved by using a wier wall in the outlet structure. 2-yr (cfs) 10-yr (cfs) 100-yr (cfs) Snow Melt (cfs) Pre-Development Rate 4.5 11.77 29.38 0.8 Post-Development Rate 3.0 11.65 27.76 0.8 SUMMARY Riley Purgatory Bluff Creek Watershed District Limit peak runoff flow rates to that from existing conditions for the two-, 10- and 100-year frequency storm events using a nested 24- hour rainfall distribution, and a 100-year frequency, 10-day snowmelt event, for all points where stormwater discharge leaves the site; Provide for the abstraction onsite of 1.1 inches of runoff from impervious surface of the parcel; i Where infiltration or filtration facilities, practices or systems are proposed, pretreatment of runoff must be provided. ii The bottom of infiltration facilities must be at least three feet above the seasonal high water table. No structure may be constructed or reconstructed such that its lowest floor elevation is less than 2 feet above the 100-year event flood elevation and no stormwater management system may be constructed or reconstructed in a manner that brings the low floor elevation of an adjacent structure into noncompliance with this standard. Stormwater management capacity of buffer area created in compliance with Rule D or otherwise will be credited toward compliance with the criteria in this rule. Arbor Glen is a proposed 18 home development. Drainage will be focused rear yard swales, a stormwater pond, wetland buffers, and a final discharge into the nearby wetland. Tables within this report show the total impact / treatment requirements due to Arbor Glen. HydroCAD was used to model rate control for this project. The table below compares pre-development and post-development rates. Volume Control Volume Control requirements state that the stormwater management plan must provide for the abstraction of 1.1" of rainfall for the site's impervious surface. Quality Control Provide for at least sixty percent (60 percent) annual removal efficiency for total phosphorus, and at least ninety percent (90%) annual removal efficiency for total suspended solids from site runoff. The onsite abstraction of runoff may be included in demonstrating compliance with the total suspended solids and total phosphorus removal requirements. Rate Control Rate control design standards are to maintain pre-development peak runoff rates for the 2-yr, 10-yr, 100-yr 24-hour storm events. This site was designed to meet 90% TSS and 60% Phophorus Removal . MIDS was used to model loading for this project; note that the SUMP has not been modeled in MIDS We have met the abstraction volume by providing a water harvesting system. We plan to irrigate the individual lots with 0.5" of water and the open space with 1.5" of water over a 48 hour period as shown on the attached plan by Water in Motion. Project Information Calculator Version:Version 2: June 2014 Project Name:Arbor Glen User Name / Company Name: Sathre-Bergquist, Inc. Date:12-22-2015 Project Description: Site Information Retention Requirement (inches): 1.1 Site's Zip Code:55391 Annual Rainfall (inches):29.9 Phosphorus EMC (mg/l):0.3 TSS EMC (mg/l):54.5 Total Site Area Land Cover A Soils (acres) B Soils (acres) C Soils (acres) D Soils (acres) Total (acres) Forest/Open Space -Undisturbed, protected forest/open space or reforested land 0 0 0 0 0 Managed Turf -disturbed, graded for yards or other turf to be mowed/managed 0 0 4.28 4.28 Impervious Area (acres) 1.56 Total Area (acres) 5.84 Site Areas Routed to BMPs Land Cover A Soils (acres) B Soils (acres) C Soils (acres) D Soils (acres) Total (acres) Forest/Open Space -Undisturbed, protected forest/open space or reforested land 0 Managed Turf -disturbed, graded for yards or other turf to be mowed/managed 4.28 4.28 Impervious Area (acres) 1.56 Total Area (acres) 5.84 Summary Information Performance Goal Requirement Performance goal volume retention requirement: 6229 ft3 Volume removed by BMPs towards performance goal: 6229 ft3 Percent volume removed towards performance goal 100 % Annual Volume and Pollutant Load Reductions Post development annual runoff volume 5.4349 acre-ft Annual runoff volume removed by BMPs: 3.1141 acre-ft Percent annual runoff volume removed: 57 % Post development annual particulate P load: 2.44 lbs Annual particulate P removed by BMPs:2.22 lbs Post development annual dissolved P load: 2 lbs Annual dissolved P removed by BMPs: 1.32 lbs Percent annual total phosphorus removed: 80 % Post development annual TSS load:806 lbs Annual TSS removed by BMPs: 731 lbs Percent annual TSS removed: 91 % BMP Summary Performance Goal Summary BMP Name BMP Volume Capacity (ft3) Volume Recieved (ft3) Volume Retained (ft3) Volume Outflow (ft3) Percent Retained (%) 1 - Swale Side Slope - Area 2 417 40 40 0 100 1 - Swale main channel - Area 1A 74 918 74 844 8 2 - Swale main channel - Area 1B 71 599 71 528 12 3 - Swale main channel 42 399 42 357 11 4 - Swale main channel 63 40 40 0 100 1 - Harvest and re-use/Cistern 6621 5962 5962 0 100 1 - Constructed stormwater pond -Area 1C 0 5962 0 5962 0 Annual Volume Summary BMP Name Volume From Direct Watershed (acre-ft) Volume From Upstream BMPs (acre-ft) Volume Retained (acre-ft) Volume outflow (acre-ft) Percent Retained (%) 1 - Swale Side Slope - Area 2 0.4949 0 0.1546 0.3403 31 1 - Swale main channel - Area 1A 0.7071 0 0.1189 0.5882 17 2 - Swale main channel - Area 1B 0.4774 0 0.1087 0.3687 23 3 - Swale main channel 0.3709 0 0.0723 0.2986 19 4 - Swale main channel 0.0904 0 0.0522 0.0382 58 1 - Harvest and re-use/Cistern 0 4.5879 2.6074 1.9805 57 1 -Constructed stormwater pond -Area 1C 3.2942 1.2937 0 4.5879 0 Particulate Phosphorus Summary BMP Name Load From Direct Watershed (lbs) Load From Upstream BMPs (lbs) Load Retained (lbs) Outflow Load (lbs) Percent Retained (%) 1 - Swale Side Slope - Area 2 0.22 0 0.07 0.15 31 1 - Swale main channel - Area 1A 0.32 0 0.25 0.07 78 2 - Swale main channel - Area 1B 0.21 0 0.17 0.04 79 3 - Swale main channel 0.17 0 0.13 0.04 78 4 - Swale main channel 0.04 0 0.04 0 89 1 - Harvest and re-use/Cistern 0 0.16 0.09 0.07 57 1 - Constructed stormwater pond -Area 1C 1.48 0.15 1.47 0.16 90 Dissolved Phosphorus Summary BMP Name Load From Direct Watershed (lbs) Load From Upstream BMPs (lbs) Load Retained (lbs) Outflow Load (lbs) Percent Retained (%) 1 - Swale Side Slope - Area 2 0.18 0 0.06 0.12 31 1 - Swale main channel - Area 1A 0.26 0 0.04 0.22 17 2 - Swale main channel - Area 1B 0.18 0 0.04 0.14 23 3 - Swale main channel 0.14 0 0.03 0.11 19 4 - Swale main channel 0.03 0 0.02 0.01 58 1 - Harvest and re-use/Cistern 0 1.3 0.74 0.56 57 1 - Constructed stormwater pond -Area 1C 1.21 0.48 0.39 1.3 23 TSS Summary BMP Name Load From Direct Watershed (lbs) Load From Upstream BMPs (lbs) Load Retained (lbs) Outflow Load (lbs) Percent Retained (%) 1 - Swale Side Slope - Area 2 73 0 23 50 31 1 - Swale main channel - Area 1A 105 0 77 28 73 2 - Swale main channel - Area 1B 71 0 53 18 75 3 - Swale main channel 55 0 41 14 74 4 - Swale main channel 13 0 11 2 86 1 - Harvest and re-use/Cistern 0 55 31 24 57 1 -Constructed stormwater pond -Area 1C 488 62 495 55 90 BMP Schematic 1 Proposed 1A 2 PROPOSED 3S Proposed 1B 2P POND A WP WETLAND P 10L Irrigation System Routing Diagram for ARBORGLEN 05112017 Prepared by Sathre-Bergquist, Inc., Printed 5/16/2017 HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Subcat Reach Pond Link Proposed Condition ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 2HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 4.790 83 1/4 acre lots, 38% imp, HSG C (1, 3S) 1.000 65 Brush, Good, HSG C (2) 0.050 98 Water Surface, HSG C (2) 5.840 80 TOTAL AREA Proposed Condition ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 3HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 5.840 HSG C 1, 2, 3S 0.000 HSG D 0.000 Other 5.840 TOTAL AREA Proposed Condition ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 4HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Ground Covers (selected 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 4.790 0.000 0.000 4.790 1/4 acre lots, 38% imp 1, 3S 0.000 0.000 1.000 0.000 0.000 1.000 Brush, Good 2 0.000 0.000 0.050 0.000 0.000 0.050 Water Surface 2 0.000 0.000 5.840 0.000 0.000 5.840 TOTAL AREA Proposed Condition ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 5HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Pipe Listing (selected 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 1 0.00 0.00 660.0 0.0300 0.013 15.0 0.0 0.0 2 3S 0.00 0.00 660.0 0.0300 0.013 18.0 0.0 0.0 3 2P 898.00 888.00 80.0 0.1250 0.012 18.0 0.0 0.0 Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 6HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=1.680 ac 38.00% Impervious Runoff Depth=1.52"Subcatchment 1: Proposed 1A Flow Length=810' Tc=15.5 min CN=74/98 Runoff=2.76 cfs 0.212 af Runoff Area=1.050 ac 4.76% Impervious Runoff Depth=0.55"Subcatchment 2: PROPOSED Flow Length=300' Slope=0.1000 '/' Tc=13.1 min CN=65/98 Runoff=0.54 cfs 0.048 af Runoff Area=3.110 ac 38.00% Impervious Runoff Depth=1.52"Subcatchment 3S: Proposed 1B Flow Length=916' Tc=16.3 min CN=74/98 Runoff=4.97 cfs 0.393 af Peak Elev=900.46' Storage=13,718 cf Inflow=7.72 cfs 0.605 afPond 2P: POND A Primary=2.76 cfs 0.339 af Secondary=0.00 cfs 0.000 af Outflow=2.76 cfs 0.339 af Inflow=2.99 cfs 0.387 afPond WP: WETLAND P Primary=2.99 cfs 0.387 af Inflow=0.00 cfs 0.000 afLink 10L: Irrigation System Primary=0.00 cfs 0.000 af Total Runoff Area = 5.840 ac Runoff Volume = 0.653 af Average Runoff Depth = 1.34" 67.98% Pervious = 3.970 ac 32.02% Impervious = 1.870 ac Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 7HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1: Proposed 1A Runoff = 2.76 cfs @ 12.21 hrs, Volume= 0.212 af, Depth= 1.52" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87" Area (ac) CN Description 1.680 83 1/4 acre lots, 38% imp, HSG C 0.000 87 1/4 acre lots, 38% imp, HSG D 1.680 83 Weighted Average 1.042 74 62.00% Pervious Area 0.638 98 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.3 150 0.0200 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.2 660 0.0300 9.12 11.19 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Concrete pipe, bends & connections 15.5 810 Total Subcatchment 1: Proposed 1A Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87" Runoff Area=1.680 ac Runoff Volume=0.212 af Runoff Depth=1.52" Flow Length=810' Tc=15.5 min CN=74/98 2.76 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 8HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 2: PROPOSED Runoff = 0.54 cfs @ 12.21 hrs, Volume= 0.048 af, Depth= 0.55" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87" Area (ac) CN Description 1.000 65 Brush, Good, HSG C 0.050 98 Water Surface, HSG C 1.050 67 Weighted Average 1.000 65 95.24% Pervious Area 0.050 98 4.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 300 0.1000 0.38 Sheet Flow, Rear Yard Grass: Short n= 0.150 P2= 2.87" Subcatchment 2: PROPOSED Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (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 MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87" Runoff Area=1.050 ac Runoff Volume=0.048 af Runoff Depth=0.55" Flow Length=300' Slope=0.1000 '/' Tc=13.1 min CN=65/98 0.54 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 9HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Proposed 1B Runoff = 4.97 cfs @ 12.22 hrs, Volume= 0.393 af, Depth= 1.52" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87" Area (ac) CN Description 3.110 83 1/4 acre lots, 38% imp, HSG C 0.000 87 1/4 acre lots, 38% imp, HSG D 3.110 83 Weighted Average 1.928 74 62.00% Pervious Area 1.182 98 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.2 256 0.0500 0.28 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.1 660 0.0300 10.30 18.19 Pipe Channel, RCP_Round 18" 18.0" Round Area= 1.8 sf Perim= 4.7' r= 0.38' n= 0.013 Concrete pipe, bends & connections 16.3 916 Total Subcatchment 3S: Proposed 1B Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)5 4 3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87" Runoff Area=3.110 ac Runoff Volume=0.393 af Runoff Depth=1.52" Flow Length=916' Tc=16.3 min CN=74/98 4.97 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 10HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond 2P: POND A Inflow Area = 4.790 ac, 38.00% Impervious, Inflow Depth = 1.52" for 2y 24hr event Inflow = 7.72 cfs @ 12.22 hrs, Volume= 0.605 af Outflow = 2.76 cfs @ 12.57 hrs, Volume= 0.339 af, Atten= 64%, Lag= 21.0 min Primary = 2.76 cfs @ 12.57 hrs, Volume= 0.339 af Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Peak Elev= 900.46' @ 12.57 hrs Surf.Area= 0 sf Storage= 13,718 cf Plug-Flow detention time= 216.4 min calculated for 0.339 af (56% of inflow) Center-of-Mass det. time= 113.3 min ( 910.7 - 797.4 ) Volume Invert Avail.Storage Storage Description #1 895.99' 25,003 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 895.99 0 896.00 4,000 898.00 8,500 900.00 12,600 902.00 17,500 904.00 22,800 910.00 25,003 Device Routing Invert Outlet Devices #1 Device 2 899.50'Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 2.30 2.30 6.00 Width (feet) 0.90 0.90 4.00 4.00 #2 Primary 898.00'18.0" Round RCP_Round 18" L= 80.0' RCP, rounded edge headwall, Ke= 0.100 Inlet / Outlet Invert= 898.00' / 888.00' S= 0.1250 '/' Cc= 0.900 n= 0.012 Concrete pipe, finished, Flow Area= 1.77 sf #3 Secondary 904.00'Land EOF, Cv= 2.62 (C= 3.28) Head (feet) 0.00 3.00 Width (feet) 5.00 5.00 Primary OutFlow Max=2.76 cfs @ 12.57 hrs HW=900.46' TW=0.00' (Dynamic Tailwater) 2=RCP_Round 18" (Passes 2.76 cfs of 15.16 cfs potential flow) 1=Custom Weir/Orifice (Weir Controls 2.76 cfs @ 3.20 fps) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=895.99' TW=0.00' (Dynamic Tailwater) 3=Land EOF ( Controls 0.00 cfs) Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 11HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Pond 2P: POND A Inflow Outflow Primary Secondary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)8 7 6 5 4 3 2 1 0 Inflow Area=4.790 ac Peak Elev=900.46' Storage=13,718 cf 7.72 cfs 2.76 cfs 2.76 cfs 0.00 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 12HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WP: WETLAND P [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.840 ac, 32.02% Impervious, Inflow Depth = 0.80" for 2y 24hr event Inflow = 2.99 cfs @ 12.56 hrs, Volume= 0.387 af Primary = 2.99 cfs @ 12.57 hrs, Volume= 0.387 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WP: WETLAND P Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)3 2 1 0 Inflow Area=5.840 ac 2.99 cfs 2.99 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 13HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Link 10L: Irrigation System Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Link 10L: Irrigation System Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)1 0 0.00 cfs 0.00 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 14HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=1.680 ac 38.00% Impervious Runoff Depth=2.65"Subcatchment 1: Proposed 1A Flow Length=810' Tc=15.5 min CN=74/98 Runoff=5.06 cfs 0.371 af Runoff Area=1.050 ac 4.76% Impervious Runoff Depth=1.32"Subcatchment 2: PROPOSED Flow Length=300' Slope=0.1000 '/' Tc=13.1 min CN=65/98 Runoff=1.65 cfs 0.116 af Runoff Area=3.110 ac 38.00% Impervious Runoff Depth=2.65"Subcatchment 3S: Proposed 1B Flow Length=916' Tc=16.3 min CN=74/98 Runoff=9.11 cfs 0.686 af Peak Elev=901.83' Storage=17,081 cf Inflow=14.15 cfs 1.057 afPond 2P: POND A Primary=10.53 cfs 0.791 af Secondary=0.00 cfs 0.000 af Outflow=10.53 cfs 0.791 af Inflow=11.65 cfs 0.907 afPond WP: WETLAND P Primary=11.65 cfs 0.907 af Inflow=0.00 cfs 0.000 afLink 10L: Irrigation System Primary=0.00 cfs 0.000 af Total Runoff Area = 5.840 ac Runoff Volume = 1.173 af Average Runoff Depth = 2.41" 67.98% Pervious = 3.970 ac 32.02% Impervious = 1.870 ac Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 15HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1: Proposed 1A Runoff = 5.06 cfs @ 12.21 hrs, Volume= 0.371 af, Depth= 2.65" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27" Area (ac) CN Description 1.680 83 1/4 acre lots, 38% imp, HSG C 0.000 87 1/4 acre lots, 38% imp, HSG D 1.680 83 Weighted Average 1.042 74 62.00% Pervious Area 0.638 98 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.3 150 0.0200 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.2 660 0.0300 9.12 11.19 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Concrete pipe, bends & connections 15.5 810 Total Subcatchment 1: Proposed 1A Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)5 4 3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27" Runoff Area=1.680 ac Runoff Volume=0.371 af Runoff Depth=2.65" Flow Length=810' Tc=15.5 min CN=74/98 5.06 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 16HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 2: PROPOSED Runoff = 1.65 cfs @ 12.19 hrs, Volume= 0.116 af, Depth= 1.32" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27" Area (ac) CN Description 1.000 65 Brush, Good, HSG C 0.050 98 Water Surface, HSG C 1.050 67 Weighted Average 1.000 65 95.24% Pervious Area 0.050 98 4.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 300 0.1000 0.38 Sheet Flow, Rear Yard Grass: Short n= 0.150 P2= 2.87" Subcatchment 2: PROPOSED Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)1 0 MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27" Runoff Area=1.050 ac Runoff Volume=0.116 af Runoff Depth=1.32" Flow Length=300' Slope=0.1000 '/' Tc=13.1 min CN=65/98 1.65 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 17HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Proposed 1B Runoff = 9.11 cfs @ 12.22 hrs, Volume= 0.686 af, Depth= 2.65" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27" Area (ac) CN Description 3.110 83 1/4 acre lots, 38% imp, HSG C 0.000 87 1/4 acre lots, 38% imp, HSG D 3.110 83 Weighted Average 1.928 74 62.00% Pervious Area 1.182 98 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.2 256 0.0500 0.28 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.1 660 0.0300 10.30 18.19 Pipe Channel, RCP_Round 18" 18.0" Round Area= 1.8 sf Perim= 4.7' r= 0.38' n= 0.013 Concrete pipe, bends & connections 16.3 916 Total Subcatchment 3S: Proposed 1B Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)10 9 8 7 6 5 4 3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27" Runoff Area=3.110 ac Runoff Volume=0.686 af Runoff Depth=2.65" Flow Length=916' Tc=16.3 min CN=74/98 9.11 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 18HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond 2P: POND A Inflow Area = 4.790 ac, 38.00% Impervious, Inflow Depth = 2.65" for 10y 24hr event Inflow = 14.15 cfs @ 12.22 hrs, Volume= 1.057 af Outflow = 10.53 cfs @ 12.35 hrs, Volume= 0.791 af, Atten= 26%, Lag= 7.9 min Primary = 10.53 cfs @ 12.35 hrs, Volume= 0.791 af Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Peak Elev= 901.83' @ 12.35 hrs Surf.Area= 0 sf Storage= 17,081 cf Plug-Flow detention time= 120.9 min calculated for 0.791 af (75% of inflow) Center-of-Mass det. time= 56.7 min ( 838.6 - 782.0 ) Volume Invert Avail.Storage Storage Description #1 895.99' 25,003 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 895.99 0 896.00 4,000 898.00 8,500 900.00 12,600 902.00 17,500 904.00 22,800 910.00 25,003 Device Routing Invert Outlet Devices #1 Device 2 899.50'Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 2.30 2.30 6.00 Width (feet) 0.90 0.90 4.00 4.00 #2 Primary 898.00'18.0" Round RCP_Round 18" L= 80.0' RCP, rounded edge headwall, Ke= 0.100 Inlet / Outlet Invert= 898.00' / 888.00' S= 0.1250 '/' Cc= 0.900 n= 0.012 Concrete pipe, finished, Flow Area= 1.77 sf #3 Secondary 904.00'Land EOF, Cv= 2.62 (C= 3.28) Head (feet) 0.00 3.00 Width (feet) 5.00 5.00 Primary OutFlow Max=10.52 cfs @ 12.35 hrs HW=901.83' TW=0.00' (Dynamic Tailwater) 2=RCP_Round 18" (Passes 10.52 cfs of 20.36 cfs potential flow) 1=Custom Weir/Orifice (Weir Controls 10.52 cfs @ 4.82 fps) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=895.99' TW=0.00' (Dynamic Tailwater) 3=Land EOF ( Controls 0.00 cfs) Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 19HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Pond 2P: POND A Inflow Outflow Primary Secondary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=4.790 ac Peak Elev=901.83' Storage=17,081 cf 14.15 cfs 10.53 cfs 10.53 cfs 0.00 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 20HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WP: WETLAND P [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.840 ac, 32.02% Impervious, Inflow Depth = 1.86" for 10y 24hr event Inflow = 11.65 cfs @ 12.34 hrs, Volume= 0.907 af Primary = 11.65 cfs @ 12.35 hrs, Volume= 0.907 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WP: WETLAND P Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=5.840 ac 11.65 cfs 11.65 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 21HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Link 10L: Irrigation System Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Link 10L: Irrigation System Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)1 0 0.00 cfs 0.00 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 22HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=1.680 ac 38.00% Impervious Runoff Depth=5.45"Subcatchment 1: Proposed 1A Flow Length=810' Tc=15.5 min CN=74/98 Runoff=9.82 cfs 0.764 af Runoff Area=1.050 ac 4.76% Impervious Runoff Depth=3.60"Subcatchment 2: PROPOSED Flow Length=300' Slope=0.1000 '/' Tc=13.1 min CN=65/98 Runoff=4.57 cfs 0.315 af Runoff Area=3.110 ac 38.00% Impervious Runoff Depth=5.45"Subcatchment 3S: Proposed 1B Flow Length=916' Tc=16.3 min CN=74/98 Runoff=17.72 cfs 1.413 af Peak Elev=903.05' Storage=20,295 cf Inflow=27.51 cfs 2.177 afPond 2P: POND A Primary=24.07 cfs 1.911 af Secondary=0.00 cfs 0.000 af Outflow=24.07 cfs 1.911 af Inflow=27.76 cfs 2.226 afPond WP: WETLAND P Primary=27.76 cfs 2.226 af Inflow=0.00 cfs 0.000 afLink 10L: Irrigation System Primary=0.00 cfs 0.000 af Total Runoff Area = 5.840 ac Runoff Volume = 2.492 af Average Runoff Depth = 5.12" 67.98% Pervious = 3.970 ac 32.02% Impervious = 1.870 ac Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 23HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1: Proposed 1A Runoff = 9.82 cfs @ 12.21 hrs, Volume= 0.764 af, Depth= 5.45" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41" Area (ac) CN Description 1.680 83 1/4 acre lots, 38% imp, HSG C 0.000 87 1/4 acre lots, 38% imp, HSG D 1.680 83 Weighted Average 1.042 74 62.00% Pervious Area 0.638 98 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.3 150 0.0200 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.2 660 0.0300 9.12 11.19 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Concrete pipe, bends & connections 15.5 810 Total Subcatchment 1: Proposed 1A Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)11 10 9 8 7 6 5 4 3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41" Runoff Area=1.680 ac Runoff Volume=0.764 af Runoff Depth=5.45" Flow Length=810' Tc=15.5 min CN=74/98 9.82 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 24HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 2: PROPOSED Runoff = 4.57 cfs @ 12.18 hrs, Volume= 0.315 af, Depth= 3.60" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41" Area (ac) CN Description 1.000 65 Brush, Good, HSG C 0.050 98 Water Surface, HSG C 1.050 67 Weighted Average 1.000 65 95.24% Pervious Area 0.050 98 4.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 300 0.1000 0.38 Sheet Flow, Rear Yard Grass: Short n= 0.150 P2= 2.87" Subcatchment 2: PROPOSED Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)5 4 3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41" Runoff Area=1.050 ac Runoff Volume=0.315 af Runoff Depth=3.60" Flow Length=300' Slope=0.1000 '/' Tc=13.1 min CN=65/98 4.57 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 25HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Proposed 1B Runoff = 17.72 cfs @ 12.22 hrs, Volume= 1.413 af, Depth= 5.45" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41" Area (ac) CN Description 3.110 83 1/4 acre lots, 38% imp, HSG C 0.000 87 1/4 acre lots, 38% imp, HSG D 3.110 83 Weighted Average 1.928 74 62.00% Pervious Area 1.182 98 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.2 256 0.0500 0.28 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.1 660 0.0300 10.30 18.19 Pipe Channel, RCP_Round 18" 18.0" Round Area= 1.8 sf Perim= 4.7' r= 0.38' n= 0.013 Concrete pipe, bends & connections 16.3 916 Total Subcatchment 3S: Proposed 1B Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41" Runoff Area=3.110 ac Runoff Volume=1.413 af Runoff Depth=5.45" Flow Length=916' Tc=16.3 min CN=74/98 17.72 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 26HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond 2P: POND A Inflow Area = 4.790 ac, 38.00% Impervious, Inflow Depth = 5.45" for 100y 24hr event Inflow = 27.51 cfs @ 12.21 hrs, Volume= 2.177 af Outflow = 24.07 cfs @ 12.29 hrs, Volume= 1.911 af, Atten= 12%, Lag= 4.9 min Primary = 24.07 cfs @ 12.29 hrs, Volume= 1.911 af Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Peak Elev= 903.05' @ 12.29 hrs Surf.Area= 0 sf Storage= 20,295 cf Plug-Flow detention time= 68.8 min calculated for 1.911 af (88% of inflow) Center-of-Mass det. time= 32.4 min ( 801.3 - 768.9 ) Volume Invert Avail.Storage Storage Description #1 895.99' 25,003 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 895.99 0 896.00 4,000 898.00 8,500 900.00 12,600 902.00 17,500 904.00 22,800 910.00 25,003 Device Routing Invert Outlet Devices #1 Device 2 899.50'Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 2.30 2.30 6.00 Width (feet) 0.90 0.90 4.00 4.00 #2 Primary 898.00'18.0" Round RCP_Round 18" L= 80.0' RCP, rounded edge headwall, Ke= 0.100 Inlet / Outlet Invert= 898.00' / 888.00' S= 0.1250 '/' Cc= 0.900 n= 0.012 Concrete pipe, finished, Flow Area= 1.77 sf #3 Secondary 904.00'Land EOF, Cv= 2.62 (C= 3.28) Head (feet) 0.00 3.00 Width (feet) 5.00 5.00 Primary OutFlow Max=24.07 cfs @ 12.29 hrs HW=903.05' TW=0.00' (Dynamic Tailwater) 2=RCP_Round 18" (Inlet Controls 24.07 cfs @ 13.62 fps) 1=Custom Weir/Orifice (Passes 24.07 cfs of 34.00 cfs potential flow) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=895.99' TW=0.00' (Dynamic Tailwater) 3=Land EOF ( Controls 0.00 cfs) Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 27HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Pond 2P: POND A Inflow Outflow Primary Secondary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=4.790 ac Peak Elev=903.05' Storage=20,295 cf 27.51 cfs 24.07 cfs 24.07 cfs 0.00 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 28HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WP: WETLAND P [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.840 ac, 32.02% Impervious, Inflow Depth = 4.57" for 100y 24hr event Inflow = 27.76 cfs @ 12.24 hrs, Volume= 2.226 af Primary = 27.76 cfs @ 12.25 hrs, Volume= 2.226 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WP: WETLAND P Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=5.840 ac 27.76 cfs 27.76 cfs Proposed Condition MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 29HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Link 10L: Irrigation System Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Link 10L: Irrigation System Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)1 0 0.00 cfs 0.00 cfs Proposed Condition MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 30HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=1.680 ac 38.00% Impervious Runoff Depth>4.66"Subcatchment 1: Proposed 1A Flow Length=810' Tc=15.5 min CN=74/98 Runoff=0.26 cfs 0.653 af Runoff Area=1.050 ac 4.76% Impervious Runoff Depth>2.93"Subcatchment 2: PROPOSED Flow Length=300' Slope=0.1000 '/' Tc=13.1 min CN=65/98 Runoff=0.12 cfs 0.256 af Runoff Area=3.110 ac 38.00% Impervious Runoff Depth>4.66"Subcatchment 3S: Proposed 1B Flow Length=916' Tc=16.3 min CN=74/98 Runoff=0.49 cfs 1.208 af Peak Elev=899.90' Storage=12,394 cf Inflow=0.75 cfs 1.861 afPond 2P: POND A Primary=0.74 cfs 1.591 af Secondary=0.00 cfs 0.000 af Outflow=0.74 cfs 1.591 af Inflow=0.86 cfs 1.847 afPond WP: WETLAND P Primary=0.86 cfs 1.847 af Inflow=0.00 cfs 0.000 afLink 10L: Irrigation System Primary=0.00 cfs 0.000 af Total Runoff Area = 5.840 ac Runoff Volume = 2.117 af Average Runoff Depth = 4.35" 67.98% Pervious = 3.970 ac 32.02% Impervious = 1.870 ac Proposed Condition MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 31HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1: Proposed 1A Runoff = 0.26 cfs @ 121.37 hrs, Volume= 0.653 af, Depth> 4.66" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20" Area (ac) CN Description 1.680 83 1/4 acre lots, 38% imp, HSG C 0.000 87 1/4 acre lots, 38% imp, HSG D 1.680 83 Weighted Average 1.042 74 62.00% Pervious Area 0.638 98 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.3 150 0.0200 0.17 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.2 660 0.0300 9.12 11.19 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Concrete pipe, bends & connections 15.5 810 Total Subcatchment 1: Proposed 1A Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (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 MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20" Runoff Area=1.680 ac Runoff Volume=0.653 af Runoff Depth>4.66" Flow Length=810' Tc=15.5 min CN=74/98 0.26 cfs Proposed Condition MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 32HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 2: PROPOSED Runoff = 0.12 cfs @ 121.35 hrs, Volume= 0.256 af, Depth> 2.93" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20" Area (ac) CN Description 1.000 65 Brush, Good, HSG C 0.050 98 Water Surface, HSG C 1.050 67 Weighted Average 1.000 65 95.24% Pervious Area 0.050 98 4.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 300 0.1000 0.38 Sheet Flow, Rear Yard Grass: Short n= 0.150 P2= 2.87" Subcatchment 2: PROPOSED Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)0.125 0.12 0.115 0.11 0.105 0.1 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 MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20" Runoff Area=1.050 ac Runoff Volume=0.256 af Runoff Depth>2.93" Flow Length=300' Slope=0.1000 '/' Tc=13.1 min CN=65/98 0.12 cfs Proposed Condition MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 33HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Proposed 1B Runoff = 0.49 cfs @ 121.40 hrs, Volume= 1.208 af, Depth> 4.66" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20" Area (ac) CN Description 3.110 83 1/4 acre lots, 38% imp, HSG C 0.000 87 1/4 acre lots, 38% imp, HSG D 3.110 83 Weighted Average 1.928 74 62.00% Pervious Area 1.182 98 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.2 256 0.0500 0.28 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.1 660 0.0300 10.30 18.19 Pipe Channel, RCP_Round 18" 18.0" Round Area= 1.8 sf Perim= 4.7' r= 0.38' n= 0.013 Concrete pipe, bends & connections 16.3 916 Total Subcatchment 3S: Proposed 1B Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20" Runoff Area=3.110 ac Runoff Volume=1.208 af Runoff Depth>4.66" Flow Length=916' Tc=16.3 min CN=74/98 0.49 cfs Proposed Condition MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 34HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond 2P: POND A Inflow Area = 4.790 ac, 38.00% Impervious, Inflow Depth > 4.66" for RPBCWD-Snowmelt event Inflow = 0.75 cfs @ 121.36 hrs, Volume= 1.861 af Outflow = 0.74 cfs @ 121.52 hrs, Volume= 1.591 af, Atten= 1%, Lag= 9.3 min Primary = 0.74 cfs @ 121.52 hrs, Volume= 1.591 af Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Peak Elev= 899.90' @ 121.52 hrs Surf.Area= 0 sf Storage= 12,394 cf Plug-Flow detention time= 1,303.3 min calculated for 1.591 af (85% of inflow) Center-of-Mass det. time= 697.9 min ( 8,051.2 - 7,353.3 ) Volume Invert Avail.Storage Storage Description #1 895.99' 25,003 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic-feet) 895.99 0 896.00 4,000 898.00 8,500 900.00 12,600 902.00 17,500 904.00 22,800 910.00 25,003 Device Routing Invert Outlet Devices #1 Device 2 899.50'Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 2.30 2.30 6.00 Width (feet) 0.90 0.90 4.00 4.00 #2 Primary 898.00'18.0" Round RCP_Round 18" L= 80.0' RCP, rounded edge headwall, Ke= 0.100 Inlet / Outlet Invert= 898.00' / 888.00' S= 0.1250 '/' Cc= 0.900 n= 0.012 Concrete pipe, finished, Flow Area= 1.77 sf #3 Secondary 904.00'Land EOF, Cv= 2.62 (C= 3.28) Head (feet) 0.00 3.00 Width (feet) 5.00 5.00 Primary OutFlow Max=0.74 cfs @ 121.52 hrs HW=899.90' TW=0.00' (Dynamic Tailwater) 2=RCP_Round 18" (Passes 0.74 cfs of 12.44 cfs potential flow) 1=Custom Weir/Orifice (Weir Controls 0.74 cfs @ 2.07 fps) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=895.99' TW=0.00' (Dynamic Tailwater) 3=Land EOF ( Controls 0.00 cfs) Proposed Condition MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 35HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Pond 2P: POND A Inflow Outflow Primary Secondary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)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=4.790 ac Peak Elev=899.90' Storage=12,394 cf 0.75 cfs 0.74 cfs 0.74 cfs 0.00 cfs Proposed Condition MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 36HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WP: WETLAND P [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 5.840 ac, 32.02% Impervious, Inflow Depth > 3.80" for RPBCWD-Snowmelt event Inflow = 0.86 cfs @ 121.49 hrs, Volume= 1.847 af Primary = 0.86 cfs @ 121.50 hrs, Volume= 1.847 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WP: WETLAND P Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (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=5.840 ac 0.86 cfs 0.86 cfs Proposed Condition MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 37HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Link 10L: Irrigation System Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Link 10L: Irrigation System Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)1 0 0.00 cfs 0.00 cfs 1E EXISTING WE WETLAND EX Routing Diagram for ARBORGLEN 05112017 Prepared by Sathre-Bergquist, Inc., Printed 5/16/2017 HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Subcat Reach Pond Link Existing Conditions ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 2HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 3.200 70 Brush, Fair, HSG C (1E) 2.800 73 Brush, Good, HSG D (1E) 6.000 71 TOTAL AREA Existing Conditions ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 3HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 3.200 HSG C 1E 2.800 HSG D 1E 0.000 Other 6.000 TOTAL AREA Existing Conditions ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 4HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Ground Covers (selected 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 3.200 0.000 0.000 3.200 Brush, Fair 1E 0.000 0.000 0.000 2.800 0.000 2.800 Brush, Good 1E 0.000 0.000 3.200 2.800 0.000 6.000 TOTAL AREA Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 5HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=6.000 ac 0.00% Impervious Runoff Depth=0.69"Subcatchment 1E: EXISTING Flow Length=620' Tc=13.9 min CN=71/0 Runoff=4.45 cfs 0.343 af Inflow=4.45 cfs 0.343 afPond WE: WETLAND EX Primary=4.45 cfs 0.343 af Total Runoff Area = 6.000 ac Runoff Volume = 0.343 af Average Runoff Depth = 0.69" 100.00% Pervious = 6.000 ac 0.00% Impervious = 0.000 ac Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 6HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1E: EXISTING Runoff = 4.45 cfs @ 12.21 hrs, Volume= 0.343 af, Depth= 0.69" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87" Area (ac) CN Description 3.200 70 Brush, Fair, HSG C 2.800 73 Brush, Good, HSG D 6.000 71 Weighted Average 6.000 71 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 300 0.0800 0.39 Sheet Flow, Range n= 0.130 P2= 2.87" 1.1 320 0.1000 4.74 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 13.9 620 Total Subcatchment 1E: EXISTING Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)4 3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87" Runoff Area=6.000 ac Runoff Volume=0.343 af Runoff Depth=0.69" Flow Length=620' Tc=13.9 min CN=71/0 4.45 cfs Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 7HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WE: WETLAND EX [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 6.000 ac, 0.00% Impervious, Inflow Depth = 0.69" for 2y 24hr event Inflow = 4.45 cfs @ 12.21 hrs, Volume= 0.343 af Primary = 4.45 cfs @ 12.22 hrs, Volume= 0.343 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WE: WETLAND EX Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)4 3 2 1 0 Inflow Area=6.000 ac 4.45 cfs 4.45 cfs Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 8HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=6.000 ac 0.00% Impervious Runoff Depth=1.58"Subcatchment 1E: EXISTING Flow Length=620' Tc=13.9 min CN=71/0 Runoff=11.77 cfs 0.791 af Inflow=11.77 cfs 0.791 afPond WE: WETLAND EX Primary=11.77 cfs 0.791 af Total Runoff Area = 6.000 ac Runoff Volume = 0.791 af Average Runoff Depth = 1.58" 100.00% Pervious = 6.000 ac 0.00% Impervious = 0.000 ac Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 9HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1E: EXISTING Runoff = 11.77 cfs @ 12.20 hrs, Volume= 0.791 af, Depth= 1.58" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27" Area (ac) CN Description 3.200 70 Brush, Fair, HSG C 2.800 73 Brush, Good, HSG D 6.000 71 Weighted Average 6.000 71 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 300 0.0800 0.39 Sheet Flow, Range n= 0.130 P2= 2.87" 1.1 320 0.1000 4.74 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 13.9 620 Total Subcatchment 1E: EXISTING Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27" Runoff Area=6.000 ac Runoff Volume=0.791 af Runoff Depth=1.58" Flow Length=620' Tc=13.9 min CN=71/0 11.77 cfs Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 10HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WE: WETLAND EX [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 6.000 ac, 0.00% Impervious, Inflow Depth = 1.58" for 10y 24hr event Inflow = 11.77 cfs @ 12.20 hrs, Volume= 0.791 af Primary = 11.77 cfs @ 12.21 hrs, Volume= 0.791 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WE: WETLAND EX Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=6.000 ac 11.77 cfs 11.77 cfs Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 11HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=6.000 ac 0.00% Impervious Runoff Depth=4.07"Subcatchment 1E: EXISTING Flow Length=620' Tc=13.9 min CN=71/0 Runoff=29.38 cfs 2.036 af Inflow=29.38 cfs 2.036 afPond WE: WETLAND EX Primary=29.38 cfs 2.036 af Total Runoff Area = 6.000 ac Runoff Volume = 2.036 af Average Runoff Depth = 4.07" 100.00% Pervious = 6.000 ac 0.00% Impervious = 0.000 ac Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 12HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1E: EXISTING Runoff = 29.38 cfs @ 12.19 hrs, Volume= 2.036 af, Depth= 4.07" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41" Area (ac) CN Description 3.200 70 Brush, Fair, HSG C 2.800 73 Brush, Good, HSG D 6.000 71 Weighted Average 6.000 71 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 300 0.0800 0.39 Sheet Flow, Range n= 0.130 P2= 2.87" 1.1 320 0.1000 4.74 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 13.9 620 Total Subcatchment 1E: EXISTING Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41" Runoff Area=6.000 ac Runoff Volume=2.036 af Runoff Depth=4.07" Flow Length=620' Tc=13.9 min CN=71/0 29.38 cfs Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 13HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WE: WETLAND EX [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 6.000 ac, 0.00% Impervious, Inflow Depth = 4.07" for 100y 24hr event Inflow = 29.38 cfs @ 12.19 hrs, Volume= 2.036 af Primary = 29.38 cfs @ 12.20 hrs, Volume= 2.036 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WE: WETLAND EX Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=6.000 ac 29.38 cfs 29.38 cfs Existing Conditions MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 14HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=6.000 ac 0.00% Impervious Runoff Depth>3.35"Subcatchment 1E: EXISTING Flow Length=620' Tc=13.9 min CN=71/0 Runoff=0.76 cfs 1.674 af Inflow=0.76 cfs 1.674 afPond WE: WETLAND EX Primary=0.76 cfs 1.674 af Total Runoff Area = 6.000 ac Runoff Volume = 1.674 af Average Runoff Depth = 3.35" 100.00% Pervious = 6.000 ac 0.00% Impervious = 0.000 ac Existing Conditions MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 15HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1E: EXISTING Runoff = 0.76 cfs @ 121.38 hrs, Volume= 1.674 af, Depth> 3.35" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20" Area (ac) CN Description 3.200 70 Brush, Fair, HSG C 2.800 73 Brush, Good, HSG D 6.000 71 Weighted Average 6.000 71 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 300 0.0800 0.39 Sheet Flow, Range n= 0.130 P2= 2.87" 1.1 320 0.1000 4.74 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 13.9 620 Total Subcatchment 1E: EXISTING Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)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 MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20" Runoff Area=6.000 ac Runoff Volume=1.674 af Runoff Depth>3.35" Flow Length=620' Tc=13.9 min CN=71/0 0.76 cfs Existing Conditions MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 16HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WE: WETLAND EX [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 6.000 ac, 0.00% Impervious, Inflow Depth > 3.35" for RPBCWD-Snowmelt event Inflow = 0.76 cfs @ 121.38 hrs, Volume= 1.674 af Primary = 0.76 cfs @ 121.39 hrs, Volume= 1.674 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WE: WETLAND EX Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)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=6.000 ac 0.76 cfs 0.76 cfs 1E EXISTING WE WETLAND EX Routing Diagram for ARBORGLEN 05112017 Prepared by Sathre-Bergquist, Inc., Printed 5/16/2017 HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Subcat Reach Pond Link Existing Conditions ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 2HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 3.200 70 Brush, Fair, HSG C (1E) 2.800 73 Brush, Good, HSG D (1E) 6.000 71 TOTAL AREA Existing Conditions ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 3HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 3.200 HSG C 1E 2.800 HSG D 1E 0.000 Other 6.000 TOTAL AREA Existing Conditions ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 4HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Ground Covers (selected 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 3.200 0.000 0.000 3.200 Brush, Fair 1E 0.000 0.000 0.000 2.800 0.000 2.800 Brush, Good 1E 0.000 0.000 3.200 2.800 0.000 6.000 TOTAL AREA Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 5HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=6.000 ac 0.00% Impervious Runoff Depth=0.69"Subcatchment 1E: EXISTING Flow Length=620' Tc=13.9 min CN=71/0 Runoff=4.45 cfs 0.343 af Inflow=4.45 cfs 0.343 afPond WE: WETLAND EX Primary=4.45 cfs 0.343 af Total Runoff Area = 6.000 ac Runoff Volume = 0.343 af Average Runoff Depth = 0.69" 100.00% Pervious = 6.000 ac 0.00% Impervious = 0.000 ac Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 6HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1E: EXISTING Runoff = 4.45 cfs @ 12.21 hrs, Volume= 0.343 af, Depth= 0.69" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87" Area (ac) CN Description 3.200 70 Brush, Fair, HSG C 2.800 73 Brush, Good, HSG D 6.000 71 Weighted Average 6.000 71 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 300 0.0800 0.39 Sheet Flow, Range n= 0.130 P2= 2.87" 1.1 320 0.1000 4.74 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 13.9 620 Total Subcatchment 1E: EXISTING Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)4 3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87" Runoff Area=6.000 ac Runoff Volume=0.343 af Runoff Depth=0.69" Flow Length=620' Tc=13.9 min CN=71/0 4.45 cfs Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr2y_S1 2y 24hr Rainfall=2.87"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 7HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WE: WETLAND EX [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 6.000 ac, 0.00% Impervious, Inflow Depth = 0.69" for 2y 24hr event Inflow = 4.45 cfs @ 12.21 hrs, Volume= 0.343 af Primary = 4.45 cfs @ 12.22 hrs, Volume= 0.343 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WE: WETLAND EX Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)4 3 2 1 0 Inflow Area=6.000 ac 4.45 cfs 4.45 cfs Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 8HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=6.000 ac 0.00% Impervious Runoff Depth=1.58"Subcatchment 1E: EXISTING Flow Length=620' Tc=13.9 min CN=71/0 Runoff=11.77 cfs 0.791 af Inflow=11.77 cfs 0.791 afPond WE: WETLAND EX Primary=11.77 cfs 0.791 af Total Runoff Area = 6.000 ac Runoff Volume = 0.791 af Average Runoff Depth = 1.58" 100.00% Pervious = 6.000 ac 0.00% Impervious = 0.000 ac Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 9HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1E: EXISTING Runoff = 11.77 cfs @ 12.20 hrs, Volume= 0.791 af, Depth= 1.58" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27" Area (ac) CN Description 3.200 70 Brush, Fair, HSG C 2.800 73 Brush, Good, HSG D 6.000 71 Weighted Average 6.000 71 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 300 0.0800 0.39 Sheet Flow, Range n= 0.130 P2= 2.87" 1.1 320 0.1000 4.74 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 13.9 620 Total Subcatchment 1E: EXISTING Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27" Runoff Area=6.000 ac Runoff Volume=0.791 af Runoff Depth=1.58" Flow Length=620' Tc=13.9 min CN=71/0 11.77 cfs Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr10y_S1 10y 24hr Rainfall=4.27"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 10HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WE: WETLAND EX [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 6.000 ac, 0.00% Impervious, Inflow Depth = 1.58" for 10y 24hr event Inflow = 11.77 cfs @ 12.20 hrs, Volume= 0.791 af Primary = 11.77 cfs @ 12.21 hrs, Volume= 0.791 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WE: WETLAND EX Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=6.000 ac 11.77 cfs 11.77 cfs Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 11HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=6.000 ac 0.00% Impervious Runoff Depth=4.07"Subcatchment 1E: EXISTING Flow Length=620' Tc=13.9 min CN=71/0 Runoff=29.38 cfs 2.036 af Inflow=29.38 cfs 2.036 afPond WE: WETLAND EX Primary=29.38 cfs 2.036 af Total Runoff Area = 6.000 ac Runoff Volume = 2.036 af Average Runoff Depth = 4.07" 100.00% Pervious = 6.000 ac 0.00% Impervious = 0.000 ac Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 12HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1E: EXISTING Runoff = 29.38 cfs @ 12.19 hrs, Volume= 2.036 af, Depth= 4.07" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41" Area (ac) CN Description 3.200 70 Brush, Fair, HSG C 2.800 73 Brush, Good, HSG D 6.000 71 Weighted Average 6.000 71 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 300 0.0800 0.39 Sheet Flow, Range n= 0.130 P2= 2.87" 1.1 320 0.1000 4.74 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 13.9 620 Total Subcatchment 1E: EXISTING Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41" Runoff Area=6.000 ac Runoff Volume=2.036 af Runoff Depth=4.07" Flow Length=620' Tc=13.9 min CN=71/0 29.38 cfs Existing Conditions MN-RPBCWD_v1_Atlas14_24-hr100y_S1 100y 24hr Rainfall=7.41"ARBORGLEN 05112017 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 13HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WE: WETLAND EX [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 6.000 ac, 0.00% Impervious, Inflow Depth = 4.07" for 100y 24hr event Inflow = 29.38 cfs @ 12.19 hrs, Volume= 2.036 af Primary = 29.38 cfs @ 12.20 hrs, Volume= 2.036 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WE: WETLAND EX Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=6.000 ac 29.38 cfs 29.38 cfs Existing Conditions MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 14HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Time span=0.00-200.00 hrs, dt=0.01 hrs, 20001 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Sim-Route method - Pond routing by Sim-Route method Runoff Area=6.000 ac 0.00% Impervious Runoff Depth>3.35"Subcatchment 1E: EXISTING Flow Length=620' Tc=13.9 min CN=71/0 Runoff=0.76 cfs 1.674 af Inflow=0.76 cfs 1.674 afPond WE: WETLAND EX Primary=0.76 cfs 1.674 af Total Runoff Area = 6.000 ac Runoff Volume = 1.674 af Average Runoff Depth = 3.35" 100.00% Pervious = 6.000 ac 0.00% Impervious = 0.000 ac Existing Conditions MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 15HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Subcatchment 1E: EXISTING Runoff = 0.76 cfs @ 121.38 hrs, Volume= 1.674 af, Depth> 3.35" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-200.00 hrs, dt= 0.01 hrs MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20" Area (ac) CN Description 3.200 70 Brush, Fair, HSG C 2.800 73 Brush, Good, HSG D 6.000 71 Weighted Average 6.000 71 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 300 0.0800 0.39 Sheet Flow, Range n= 0.130 P2= 2.87" 1.1 320 0.1000 4.74 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 13.9 620 Total Subcatchment 1E: EXISTING Runoff Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)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 MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20" Runoff Area=6.000 ac Runoff Volume=1.674 af Runoff Depth>3.35" Flow Length=620' Tc=13.9 min CN=71/0 0.76 cfs Existing Conditions MN-RPBCWD Snowmelt_10d_100yr RPBCWD-Snowmelt Rainfall=7.20"ARBORGLEN 0511201 Printed 5/16/2017Prepared by Sathre-Bergquist, Inc. Page 16HydroCAD® 10.00-15 s/n 03665 © 2015 HydroCAD Software Solutions LLC Summary for Pond WE: WETLAND EX [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 6.000 ac, 0.00% Impervious, Inflow Depth > 3.35" for RPBCWD-Snowmelt event Inflow = 0.76 cfs @ 121.38 hrs, Volume= 1.674 af Primary = 0.76 cfs @ 121.39 hrs, Volume= 1.674 af, Atten= 0%, Lag= 0.6 min Routing by Sim-Route method, Time Span= 0.00-200.00 hrs, dt= 0.01 hrs Pond WE: WETLAND EX Inflow Primary Hydrograph Time (hours) 2001901801701601501401301201101009080706050403020100Flow (cfs)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=6.000 ac 0.76 cfs 0.76 cfs Project: Arbor Glen Location: Chanhassen MN Prepared for: Chanhassen Prepared by: Sathre-Bergquist, Inc. Date: June 4, 2015 Revised: November 17, 2015 Revised: May 16, 2017 Nurp Design Basin 1 P =1.1 "Storm Aw =6.00 Acres No. of Houses =18 Each Ave. House Roof Area =2250 SF No. of Driveways 18 Each Ave. Driveway Area =340 SF Area Of Street =21300 SF Topology Area CN Total Hardcover Area = 1.56 Acres 98 Grasscover = 4.44 Acres 70 Hardcover For Fi = 0.63 Acres (Streets & Drives) CN =77 Fi = 0.10 PerviousCN = 74.85 74712 6226 S = 1000/CN - 10 = 3.36 0.23128815 R = (P-.2S)(P-.2S)/(P+.8S) R = 0.05 V = RAw/12 =0.02 Acre-Feet (Required) Ponding Dead Storage Volume Based on Plan Contours - 10:1 Bench (1.0') Then 3:1 Slope Contour Area (sf) Area (Ac) Cummulative Storage(cf) (Acre-Feet) 0.00 896 Drawdown 4,000 0.09 4,000 4000 0.09 898 NWL 8,500 0.20 12,500 16500 0.38 (Provided) 900 12,600 0.29 21,100 33600 0.77 0.289 902 17,500 0.40 30,100 51200 1.18 0.402 904 HWL 22,800 0.52 40,300 70400 1.62 Dead Storage/Pond Surface Area =2.93 ft 45700 Surface area w/4:1 slope=3000 sqft Average Mean Depth=5.50 ft