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Stormwater Report - Chanhassen Specialty Grocery STORMWATER MANAGEMENT PLAN FOR CHANHASSEN SPECIALTY GROCERY CHANHASSEN, MN PREPARED BY: JESSICA TELLO SEPTEMBER 4, 2014 Chanhassen Retail September 4, 2014 Stormwater Management Plan Page 2 PROJECT INTRODUCTION The proposed project is a retail development located at the northwest quadrant of the intersection of Lake Drive and Main Street in Chanhassen, MN. The City of Chanhassen is the permitting authority in the area. The project has been designed to meet the requirements of the City of Chanhassen. Rate control and water control are met onsite through the use of an EcoStorm and filtration system. EXISTING CONDITIONS The existing site is a 2.7 acre lot bordered by Lake Drive and Main Street to the southeast and parking to the northwest. Existing impervious onsite measures 1.27 acres and consists of pavement and gravel associated with the parking areas to the northeast. The remainder of the site is covered in vegetation. Soils on site are clays, which may be classified as Hydraulic Soil Group type D. The west portion of site drains to existing catch basins in the southwest, the central portion of the site drains south, and the northeast and southeast corners of the site drain in their respective directions. The site receives offsite runoff from 0.28 acres to the northwest. The development drains to a regional pond, but there is no onsite stormwater management system in place. PROPOSED CONDITIONS The proposed development is a retail center. The development will contain two phases. Phase 1 includes a 14,000 sf building with associated parking and sidewalks, totaling 1.86 acres of impervious area. Due to the clay soils on site, infiltration is not feasible and filtration will be pursued instead. Stormwater runoff in Phase 1 will be routed to an EcoStorm pretreatment system and then to a sand filtration system. Phase 2 expands Phase 1 to include an 8,100 sf building with additional parking, for a combined total of 2.28 acres of impervious area. In Phase 2, a Triton system will be added above the sand filtration system and the parking lot expansion will be built above the stormwater management system. Chanhassen Retail September 4, 2014 Stormwater Management Plan Page 3 RATE CONTROL The development drains to a regional pond, but additional rate control is provided onsite. The stormwater calculations were performed in HydroCAD for the existing and proposed conditions. The model uses the SCS Type II, 24 hour storm durations for the 2-, 10-, and 100-year events. The results of the runoff rate comparison are summarized in the table below and additional details can be found in the attached calculations and drainage diagrams. Maximum Rate of Runoff (cfs) Storm Event Total Existing Total Proposed Phase 1 Total Proposed Phase 2 2-year 7.68 7.32 7.56 10-year 13.03 11.16 10.64 100-year 25.37 18.33 18.62 WATER QUALITY Water quality is met onsite through the use of an EcoStorm system and a sand filtration bed. See the volume reduction section. VOLUME REDUCTION Infiltration onsite is not feasible due to the clay soils present. In lieu of infiltration, the treatment volume is passed through a sand infiltration bed. The calculated treatment value is for full build out of Phase 2. The required filtration volume for Phase 1 is 7,443 cf and 9113 cf for Phase 2. Under the Phase 1 condition, 13,391 cf is treated, and under the Phase 2 condition, 15,645 cf is treated. Chanhassen Retail September 4, 2014 Stormwater Management Plan Page 4 EMERGENCY OVERFLOW In the event of a clog in the system or a rainfall event larger than the 100-year,24 hour storm, the site will drain south in a similar manner as the existing condition. EROSION & SEDIMENT CONTROL A comprehensive Stormwater Pollution Prevention Plan meeting the requirements of the 2013 MPCA NPDES permit will be developed as part of the proposed plans. SUMMARY The proposed Chanhassen Specialy Grocery project will meet the requirements of the City of Chanhassen through construction of an EcoStorm and sand filtration system. These BMPs will provide the required rate control and water quality improvements prior to discharging stormwater runoff from the site to downstream receiving waters. If you have any questions, comments, or additional information regarding this report, please contact me at jtello@sambatek.com or 763-259-6679. Sambatek, Inc. Jessica Tello, EIT Mike Brandt, PE Chanhassen Retail September 4, 2014 Stormwater Management Plan Page 5 Appendix A Drainage Diagrams 300 301 302 303 304 305 308 309 310 311 312 313 321 322 323 324 330 331 332 333 334 1 945.45 CP SAMBATEK 1 4 946.92 CP SAMBATEK 4 3 952.20 CP SAMBATEK 3 10094 943.43 STRIPE B 10095 943.53 STRIPE 10096 943.49 STRIPE E10097 943.78 STRIPE B10098 943.60 STRIPE10099 943.56 STRIPE E 944.2 6 944.4 5 10141 943.96 N.PARK B 10142 943.49 N.PARK 10143 943.63 N.PARK 10144 944.25 N.PARK E 10147 943.83 STRIPE B 10148 944.50 STRIPE E 10149 944.50 6 STALLS 945.7 7 10286 948.34 STRIPE B 10287 948.61 STRIPE E 10288 948.45 STRIPE B 10289 948.81 STRIPE E 10290 948.62 STRIPE B 10291 949.08 STRIPE E 10292 948.77 STRIPE B 10293 948.74 STRIPE E 10294 948.93 STRIPE B 10295 949.31 STRIPE E 10296 949.00 STRIPE B 10297 949.43 STRIPE E 10298 949.20 STRIPE B 10299 949.17 STRIPE E 10300 949.41 STRIPE B 10301 949.56 STRIPE E10302 949.39 STRIPE B 10303 949.76 STRIPE E 10304 949.59 STRIPE B 10305 949.51 STRIPE E 10306 949.71 STRIPE B 10307 949.99 STRIPE E10308 949.78 STRIPE B 10309 950.14 STRIPE E 10310 950.02 STRIPE B 10311 949.95 STRIPE E 10312 950.16 STRIPE B 10313 950.54 STRIPE E 10328 948.62 STRIPE B 10329 948.50 STRIPE E 10330 948.82 STRIPE B 10331 948.77 STRIPE E 10332 948.74 STRIPE B 10333 948.61 STRIPE E 10334 948.93 STRIPE B 10335 948.96 STRIPE E 10336 949.22 STRIPE B 10337 949.24 STRIPE E 10338 949.28 STRIPE B 10339 949.11 STRIPE E 10340 949.43 STRIPE B 10341 949.45 STRIPE E 10342 949.62 STRIPE B 10343 949.65 STRIPE E 10344 949.69 STRIPE B 10345 949.50 STRIPE E 10346 949.86 STRIPE B 10347 949.82 STRIPE E 10348 950.04 STRIPE B 10349 950.10 STRIPE E 10350 950.09 STRIPE B 10351 949.96 STRIPE E 10352 950.21 STRIPE B 10353 950.34 STRIPE E 10354 950.45 STRIPE B 10355 950.74 STRIPE E 951.0 3 951.7 4 951.7 7 948.8 9 10592 952.14 LSCP EDGE B 10593 952.32 LSCP EDGE 10594 952.49 LSCP EDGE E952.6 2 952.2 0952.2 5 952.3 2 10599 952.30 GRATE 10600 952.48 LSCP EDGE B 10601 952.15 LSCP EDGE 10602 952.01 LSCP EDGE E 948.5 6 949.3 0 10668 951.91 LSCP EDGE B 10669 951.46 LSCP EDGE BC 10670 950.90 LSCP EDGE10671 950.78 LSCP EDGE10672 951.06 LSCP EDGE 10673 951.14 LSCP EDGE 10674 951.43 LSCP EDGE10675 951.33 LSCP EDGE E 5"TREE 6"TREE5"TREE 949.5 3949.4 9 950.0 0 10682 950.64 GRVL EDGE B10683 950.99 GRVL EDGE 10684 951.11 GRVL EDGE 10685 950.78 GRVL EDGE10686 950.85 GRVL EDGE 10687 950.63 GRVL EDGE E 10720 953.58 TNH 951.1 3 950.5 1 10734 950.18 WM B10735 949.84 WM E 10736 949.86 GRATE 10737 950.44 GRATE 10739 951.24 GRVL EDGE B 10740 951.20 GRVL EDGE10741 950.74 GRVL EDGE 10742 950.70 GRVL EDGE 10743 950.45 GRVL EDGE 10744 950.28 GRVL EDGE E 10745 949.90 GRVL EDGE B 10746 950.12 GRVL EDGE 10747 949.29 GRVL EDGE 10748 947.81 GRVL EDGE 10749 947.82 GRVL EDGE 10750 947.83 GRVL EDGE 10751 948.35 GRVL EDGE E 950.6 0 950.3 3 950.8 8 10786 950.58 FFE 10823 950.56 FFE 10829 950.54 BLDG COR B10830 950.37 BLDG COR 10831 950.23 BLDG COR10832 950.70 BLDG COR 10833 950.72 BLDG COR10834 950.65 BLDG COR 10835 950.61 BLDG COR 10836 950.19 BLDG COR 10837 950.19 BLDG COR E 949.5 0 950.1 2 949.5 9 949.5 6 946.1 2 946.1 6 11035 945.97 MAIL BOX 11065 946.60 16 STALLS 11066 945.90 BLDG COR B 11067 945.96 BLDG COR 11068 945.89 BLDG COR 11069 945.34 BLDG COR 11070 945.34 BLDG COR 11071 944.14 BLDG COR E 11072 948.23 BRICK WALL TOP B 1.0W 11073 948.26 BRICK WALL TOP 1.0W 11074 948.30 BRICK WALL TOP 1.0W11075 948.24 BRICK WALL TOP E 1.0W 11076 946.20 FFE 11077 948.24 BRICK WALL TOP B 1.0W 11078 948.26 BRICK WALL TOP 1.0W 11079 948.25 BRICK WALL TOP 1.0W11080 948.25 BRICK WALL TOP E 1.0W 945.9 6 943.8 3 943.1 5 943.0 1 944.2 9 947.1 8 947.4 1 945.8 8 11089 943.91 TOE B 11090 944.00 TOE 11091 944.34 TOE 11092 945.38 TOE 11093 946.10 TOE 11094 946.20 TOE 11095 947.55 TOE 11096 948.37 TOE E 11097 949.51 GBRK B 11098 949.23 GBRK 11099 948.97 GBRK11100 948.69 GBRK 11101 948.37 GBRK 11102 948.61 GBRK E 949.1 8 11104 948.31 GBRK B 11105 948.27 GBRK 11106 947.29 GBRK 11107 946.18 GBRK 11108 945.98 GBRK 11109 945.88 GBRK11110 945.76 GBRK 11111 945.49 GBRK 11112 945.13 GBRK11113 944.53 GBRK 945.0 0 944.1 9 11116 943.18 GBRK11117 943.05 GBRK 943.3 5 11119 942.68 GBRK11120 943.14 GBRK 11121 943.93 GBRK 11122 944.20 GBRK 11123 944.07 GBRK 11124 943.68 GBRK 11126 944.30 GBRK 11127 944.61 GBRK E 941.2 8 11129 940.20 WATER 940.8 2 11131 940.23 WATER 941.0 1 11133 940.30 WATER 941.0 111135 940.23 WATER 940.6 4 11137 940.26 WATER 940.8 5 11139 940.22 WATER 940.6 1 11141 940.24 WATER 940.7 6 11143 940.26 WATER 940.9 5 11145 940.21 WATER 940.8 6 11147 940.25 WATER 11148 941.14 TOE B 11149 941.30 TOE 11150 941.51 TOE 11151 941.22 TOE 11152 941.45 TOE 11153 941.96 TOE 11154 942.80 TOE 11155 942.52 TOE 11156 942.56 TOE 11157 942.53 TOE 11158 941.71 TOE 11159 941.32 TOE E 940.9 0 941.5 6 941.5 6 941.9 6 941.6 9 11165 950.18 GBRK B 11166 950.45 GBRK 11167 949.83 GBRK11168 949.50 GBRK 11169 950.38 GBRK 11170 950.77 GBRK 11171 949.69 GBRK 11172 948.82 GBRK 11173 947.86 GBRK 11174 947.40 GRATE 11175 947.24 GBRK 11176 946.45 GBRK 11177 946.25 GBRK E 943.6 7 940.8 8 11180 940.25 WATER CLS 943.4 6 940.9 4 11183 940.22 WATER 941.8 2 11185 940.32 WATER 944.4 1 940.7 011188 940.26 WATER 15007 948.47 334.3 301.3 B 15008 948.58 334.3 301.315009 948.44 334.3 301.315010 948.26 334.3 301.3 E 15284 947.26 BLDG COR B SHELTER 15285 947.22 BLDG COR SHELTER 15286 947.20 BLDG COR SHELTER 15287 947.34 BLDG COR SHELTER 15288 947.28 BLDG COR SHELTER 15289 947.29 BLDG COR SHELTER 15290 947.27 BLDG COR SHELTER 15291 947.29 BLDG COR SHELTER 15292 947.24 BLDG COR SHELTER CLS 15294 949.94 TNH 15300 947.78 BLDG COR SHELTER B 15301 947.77 BLDG COR SHELTER 15302 947.71 BLDG COR SHELTER 15303 947.79 BLDG COR SHELTER 15304 947.88 BLDG COR SHELTER 15305 947.96 BLDG COR SHELTER 15306 948.14 BLDG COR SHELTER 15307 948.14 BLDG COR SHELTER15308 947.94 BLDG COR SHELTER 15309 947.83 BLDG COR SHELTER CLS 15312 946.02 CP 15312 15315 947.06 LSCP B 4X4TIMBES 15316 947.17 LSCP 4X4TIMBES 15317 947.00 LSCP 4X4TIMBES 15318 947.04 LSCP CLS 4X4TIMBES15319 946.79 LSCP B 4X4TIMBES 15320 946.77 LSCP 4X4TIMBES 15321 946.68 LSCP 4X4TIMBES 15322 946.71 LSCP CLS 4X4TIMBES15324 946.48 LSCP B 4X4TIMBES 15325 946.52 LSCP 4X4TIMBES 15326 946.30 LSCP 4X4TIMBES 15327 946.33 LSCP CLS 4X4TIMBES15328 946.16 LSCP B 4X4TIMBES 15329 946.09 LSCP 4X4TIMBES 15330 945.97 LSCP 4X4TIMBES 15331 946.00 LSCP CLS 4X4TIMBES 15333 945.44 LSCP B 4X4TIMBES 15334 945.45 LSCP 4X4TIMBES 15335 945.40 LSCP 4X4TIMBES 15336 945.43 LSCP CLS 4X4TIMBES 15337 944.90 LSCP B 4X4TIMBES15338 945.03 LSCP 4X4TIMBES 15339 945.01 LSCP 4X4TIMBES 15340 944.86 LSCP CLS 4X4TIMBES 15350 944.83 4 STALLS 15395 946.19 10 STALLS 10006 943.00 CB FL 10062 949.36 SAN RIM 10089 946.55 SAN RIM 10106 943.24 CB FL 10278 948.19 CB FL 10374 948.25 CB FL 10507 952.55 SAN RIM 10703 949.80 SAN RIM 10860 948.83 CB FL 10897 948.54 CB FL 10913 949.20 CB FL 10951 949.37 CB FL 15049 948.01 SAN MH 15246 946.82 MH 15298 945.62 MH 15299 944.89 SAN MH 15342 944.22 CB FL 15447 944.39 MH 15461 950.45 CB FL 5.55BLD 57 948.03 SET IP 15812 6 LFWRCRAB"APP 5 FLWRCRAB"APP 6"BASS 7"BASS 7"BASS 7"BASS 7"BASS 7"BASS 7"BASS 7"BASS 6"BASS 6"BASS 8"ASH 6"MAP 6"MAP 8"MAP 5"S.BRY 58 951.27 FND IP 14675 59 950.97 FND IP 14675 60 950.85 FND IP RLS? 61 949.35 FND IP 15812 62 949.88 FND IP 15612 63 943.46 FND MAG 10730 951.58 CURB STOP 2X 1X 3X 4X Client Project Location Approved:Drawn: Date Submittal / Rev.No. Certification Sheet Title Summary Revision History Sheet No.Revision Project No. By VENTURE PASS PARNERS, LLC CHANHASSEN RETAIL CHANHASSEN, MN MCB JCLT VEN20145SCALE IN FEET 0 50 Sep 03, 2014 - 2:46pm - User:554 L:\PROJECTS\VEN20145\dwg\20145-DRNBASE.dwg 1/2 EXISTING DRAINAGE MAP XX XX XX XX LINK POND REACH SUB-CATCHMENT LEGEND 1 945.45 CP SAMBATEK 1 4 946.92 CP SAMBATEK 4 3 952.20 CP SAMBATEK 3 11072 948.23 BRICK WALL TOP B 1.0W 11073 948.26 BRICK WALL TOP 1.0W 11074 948.30 BRICK WALL TOP 1.0W11075 948.24 BRICK WALL TOP E 1.0W 11077 948.24 BRICK WALL TOP B 1.0W 11078 948.26 BRICK WALL TOP 1.0W 11079 948.25 BRICK WALL TOP 1.0W11080 948.25 BRICK WALL TOP E 1.0W 15312 946.02 CP 15312 10006 943.00 CB FL 10062 949.36 SAN RIM 10089 946.55 SAN RIM 10106 943.24 CB FL 10278 948.19 CB FL 10374 948.25 CB FL 10507 952.55 SAN RIM 10703 949.80 SAN RIM 10860 948.83 CB FL 10897 948.54 CB FL 10913 949.20 CB FL 10951 949.37 CB FL 15049 948.01 SAN MH 15246 946.82 MH 15298 945.62 MH 15299 944.89 SAN MH 15342 944.22 CB FL 15447 944.39 MH 15461 950.45 CB FL 5.55BLD 57 948.03 SET IP 15812 58 951.27 FND IP 14675 59 950.97 FND IP 14675 60 950.85 FND IP RLS? 61 949.35 FND IP 15812 62 949.88 FND IP 15612 63 943.46 FND MAG 13 1S 2S Client Project Location Approved:Drawn: Date Submittal / Rev.No. Certification Sheet Title Summary Revision History Sheet No.Revision Project No. By VENTURE PASS PARTNERS, LLC CHANHASSEN RETAIL CHANHASSEN, MN MCB JCLT VEN20145SCALE IN FEET 0 50 Sep 04, 2014 - 4:08pm - User:554 L:\PROJECTS\VEN20145\dwg\20145-DRNBASE.dwg 2/2 PROPOSED DRAINAGE MAP XX XX XX XX LINK POND REACH SUB-CATCHMENT LEGEND Chanhassen Retail September 4, 2014 Stormwater Management Plan Page 6 Appendix B HydroCAD Calculations 1X Existing West 2X Existing Central 3X Existing NE 4X Existing SE 5R Total Routing Diagram for VEN20145 - Existing Hydrocad Prepared by Hewlett-Packard Company, Printed 9/3/2014 HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Subcat Reach Pond Link VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 2HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (sq-ft) CNDescription (subcatchment-numbers) 78,34580>75% Grass cover, Good, HSG D (1X, 2X, 3X, 4X) 44,22798Paved parking, HSG C (1X, 2X, 3X) 11,07598Water Surface, HSG D (2X) 133,64787TOTAL AREA VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 3HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (sq-ft) Soil Group Subcatchment Numbers 0HSG A 0HSG B 44,227HSG C1X, 2X, 3X 89,420HSG D1X, 2X, 3X, 4X 0Other 133,647TOTAL AREA VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 4HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 00078,345078,345>75% Grass cover, Good 0044,2270044,227Paved parking 00011,075011,075Water Surface 0044,22789,4200133,647TOTAL AREA Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 5HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 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=23,020 sf 97.90% Impervious Runoff Depth=2.61"Subcatchment 1X: Existing West Tc=10.0 min CN=80/98 Runoff=1.86 cfs 5,002 cf Runoff Area=101,325 sf 30.12% Impervious Runoff Depth=1.60"Subcatchment 2X: Existing Central Tc=10.0 min CN=80/98 Runoff=5.36 cfs 13,516 cf Runoff Area=3,493 sf 64.41% Impervious Runoff Depth=2.11"Subcatchment 3X: Existing NE Tc=10.0 min CN=80/98 Runoff=0.23 cfs 614 cf Runoff Area=5,809 sf 0.00% Impervious Runoff Depth=1.15"Subcatchment 4X: Existing SE Tc=10.0 min CN=80/0 Runoff=0.24 cfs 558 cf Inflow=7.68 cfs 19,691 cfReach 5R: Total Outflow=7.68 cfs 19,691 cf Total Runoff Area = 133,647 sf Runoff Volume = 19,691 cf Average Runoff Depth = 1.77" 58.62% Pervious = 78,345 sf 41.38% Impervious = 55,302 sf Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 6HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1X: Existing West Runoff=1.86 cfs @ 12.01 hrs, Volume=5,002 cf, Depth=2.61" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 22,53698Paved parking, HSG C 48480>75% Grass cover, Good, HSG D 23,02098Weighted Average 484802.10% Pervious Area 22,5369897.90% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 1X: Existing West Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=23,020 sf Runoff Volume=5,002 cf Runoff Depth=2.61" Tc=10.0 min CN=80/98 1.86 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 7HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 2X: Existing Central Runoff=5.36 cfs @ 12.02 hrs, Volume=13,516 cf, Depth=1.60" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 11,07598Water Surface, HSG D 19,44198Paved parking, HSG C 70,80980>75% Grass cover, Good, HSG D 101,32585Weighted Average 70,8098069.88% Pervious Area 30,5169830.12% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 2X: Existing Central Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=101,325 sf Runoff Volume=13,516 cf Runoff Depth=1.60" Tc=10.0 min CN=80/98 5.36 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 8HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 3X: Existing NE Runoff=0.23 cfs @ 12.01 hrs, Volume=614 cf, Depth=2.11" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 2,25098Paved parking, HSG C 1,24380>75% Grass cover, Good, HSG D 3,49392Weighted Average 1,2438035.59% Pervious Area 2,2509864.41% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 3X: Existing NE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.26 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 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=3,493 sf Runoff Volume=614 cf Runoff Depth=2.11" Tc=10.0 min CN=80/98 0.23 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 9HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4X: Existing SE Runoff=0.24 cfs @ 12.02 hrs, Volume=558 cf, Depth=1.15" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 5,80980>75% Grass cover, Good, HSG D 5,80980100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 4X: Existing SE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.26 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 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=5,809 sf Runoff Volume=558 cf Runoff Depth=1.15" Tc=10.0 min CN=80/0 0.24 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 10HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Reach 5R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area =133,647 sf,41.38% Impervious, Inflow Depth = 1.77" for 2-yr event Inflow=7.68 cfs @ 12.02 hrs, Volume=19,691 cf Outflow=7.68 cfs @ 12.02 hrs, Volume=19,691 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Reach 5R: Total Inflow Outflow Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 8 7 6 5 4 3 2 1 0 Inflow Area=133,647 sf 7.68 cfs7.68 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 11HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 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=23,020 sf 97.90% Impervious Runoff Depth=4.00"Subcatchment 1X: Existing West Tc=10.0 min CN=80/98 Runoff=2.80 cfs 7,668 cf Runoff Area=101,325 sf 30.12% Impervious Runoff Depth=2.80"Subcatchment 2X: Existing Central Tc=10.0 min CN=80/98 Runoff=9.40 cfs 23,636 cf Runoff Area=3,493 sf 64.41% Impervious Runoff Depth=3.41"Subcatchment 3X: Existing NE Tc=10.0 min CN=80/98 Runoff=0.37 cfs 991 cf Runoff Area=5,809 sf 0.00% Impervious Runoff Depth=2.27"Subcatchment 4X: Existing SE Tc=10.0 min CN=80/0 Runoff=0.46 cfs 1,097 cf Inflow=13.03 cfs 33,392 cfReach 5R: Total Outflow=13.03 cfs 33,392 cf Total Runoff Area = 133,647 sf Runoff Volume = 33,392 cf Average Runoff Depth = 3.00" 58.62% Pervious = 78,345 sf 41.38% Impervious = 55,302 sf Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 12HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1X: Existing West Runoff=2.80 cfs @ 12.01 hrs, Volume=7,668 cf, Depth=4.00" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 22,53698Paved parking, HSG C 48480>75% Grass cover, Good, HSG D 23,02098Weighted Average 484802.10% Pervious Area 22,5369897.90% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 1X: Existing West Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 3 2 1 0 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=23,020 sf Runoff Volume=7,668 cf Runoff Depth=4.00" Tc=10.0 min CN=80/98 2.80 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 13HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 2X: Existing Central Runoff=9.40 cfs @ 12.01 hrs, Volume=23,636 cf, Depth=2.80" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 11,07598Water Surface, HSG D 19,44198Paved parking, HSG C 70,80980>75% Grass cover, Good, HSG D 101,32585Weighted Average 70,8098069.88% Pervious Area 30,5169830.12% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 2X: Existing Central Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=101,325 sf Runoff Volume=23,636 cf Runoff Depth=2.80" Tc=10.0 min CN=80/98 9.40 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 14HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 3X: Existing NE Runoff=0.37 cfs @ 12.01 hrs, Volume=991 cf, Depth=3.41" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 2,25098Paved parking, HSG C 1,24380>75% Grass cover, Good, HSG D 3,49392Weighted Average 1,2438035.59% Pervious Area 2,2509864.41% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 3X: Existing NE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=3,493 sf Runoff Volume=991 cf Runoff Depth=3.41" Tc=10.0 min CN=80/98 0.37 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 15HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4X: Existing SE Runoff=0.46 cfs @ 12.02 hrs, Volume=1,097 cf, Depth=2.27" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 5,80980>75% Grass cover, Good, HSG D 5,80980100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 4X: Existing SE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 0.52 0.5 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 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=5,809 sf Runoff Volume=1,097 cf Runoff Depth=2.27" Tc=10.0 min CN=80/0 0.46 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 16HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Reach 5R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area =133,647 sf,41.38% Impervious, Inflow Depth = 3.00" for 10-yr event Inflow=13.03 cfs @ 12.01 hrs, Volume=33,392 cf Outflow=13.03 cfs @ 12.01 hrs, Volume=33,392 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Reach 5R: Total Inflow Outflow Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=133,647 sf 13.03 cfs13.03 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 17HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 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=23,020 sf 97.90% Impervious Runoff Depth=7.10"Subcatchment 1X: Existing West Tc=10.0 min CN=80/98 Runoff=4.88 cfs 13,614 cf Runoff Area=101,325 sf 30.12% Impervious Runoff Depth=5.68"Subcatchment 2X: Existing Central Tc=10.0 min CN=80/98 Runoff=18.79 cfs 47,936 cf Runoff Area=3,493 sf 64.41% Impervious Runoff Depth=6.40"Subcatchment 3X: Existing NE Tc=10.0 min CN=80/98 Runoff=0.69 cfs 1,862 cf Runoff Area=5,809 sf 0.00% Impervious Runoff Depth=5.05"Subcatchment 4X: Existing SE Tc=10.0 min CN=80/0 Runoff=1.01 cfs 2,443 cf Inflow=25.37 cfs 65,854 cfReach 5R: Total Outflow=25.37 cfs 65,854 cf Total Runoff Area = 133,647 sf Runoff Volume = 65,854 cf Average Runoff Depth = 5.91" 58.62% Pervious = 78,345 sf 41.38% Impervious = 55,302 sf Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 18HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1X: Existing West Runoff=4.88 cfs @ 12.01 hrs, Volume=13,614 cf, Depth=7.10" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 22,53698Paved parking, HSG C 48480>75% Grass cover, Good, HSG D 23,02098Weighted Average 484802.10% Pervious Area 22,5369897.90% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 1X: Existing West Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=23,020 sf Runoff Volume=13,614 cf Runoff Depth=7.10" Tc=10.0 min CN=80/98 4.88 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 19HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 2X: Existing Central Runoff=18.79 cfs @ 12.01 hrs, Volume=47,936 cf, Depth=5.68" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 11,07598Water Surface, HSG D 19,44198Paved parking, HSG C 70,80980>75% Grass cover, Good, HSG D 101,32585Weighted Average 70,8098069.88% Pervious Area 30,5169830.12% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 2X: Existing Central Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=101,325 sf Runoff Volume=47,936 cf Runoff Depth=5.68" Tc=10.0 min CN=80/98 18.79 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 20HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 3X: Existing NE Runoff=0.69 cfs @ 12.01 hrs, Volume=1,862 cf, Depth=6.40" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 2,25098Paved parking, HSG C 1,24380>75% Grass cover, Good, HSG D 3,49392Weighted Average 1,2438035.59% Pervious Area 2,2509864.41% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 3X: Existing NE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=3,493 sf Runoff Volume=1,862 cf Runoff Depth=6.40" Tc=10.0 min CN=80/98 0.69 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 21HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4X: Existing SE Runoff=1.01 cfs @ 12.01 hrs, Volume=2,443 cf, Depth=5.05" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 5,80980>75% Grass cover, Good, HSG D 5,80980100.00% Pervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 4X: Existing SE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=5,809 sf Runoff Volume=2,443 cf Runoff Depth=5.05" Tc=10.0 min CN=80/0 1.01 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Existing Hydrocad Printed 9/3/2014Prepared by Hewlett-Packard Company Page 22HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Reach 5R: Total [40] Hint: Not Described (Outflow=Inflow) Inflow Area =133,647 sf,41.38% Impervious, Inflow Depth = 5.91" for 100-yr event Inflow=25.37 cfs @ 12.01 hrs, Volume=65,854 cf Outflow=25.37 cfs @ 12.01 hrs, Volume=65,854 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Reach 5R: Total Inflow Outflow Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=133,647 sf 25.37 cfs25.37 cfs 1S P1 West 2S P1 Central 3S P1 NE 4S P1 SE3R Total Site 3P Sand Filter Bed Routing Diagram for VEN20145 - Proposed Hydrocad - PHASE 1 Prepared by Hewlett-Packard Company, Printed 9/4/2014 HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Subcat Reach Pond Link VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 2HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (sq-ft) CNDescription (subcatchment-numbers) 40,20680>75% Grass cover, Good, HSG D (1S, 2S, 3S, 4S) 93,44098Paved parking, HSG D (1S, 2S, 3S, 4S) 133,64693TOTAL AREA VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 3HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (sq-ft) Soil Group Subcatchment Numbers 0HSG A 0HSG B 0HSG C 133,646HSG D1S, 2S, 3S, 4S 0Other 133,646TOTAL AREA VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 4HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 00040,206040,206>75% Grass cover, Good 00093,440093,440Paved parking 000133,6460133,646TOTAL AREA VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 5HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pipe Listing (selected nodes) Line#Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) nDiam/Width (inches) Height (inches) Inside-Fill (inches) 13P940.00939.5025.00.02000.01312.00.00.0 Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 6HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 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=31,334 sf 89.56% Impervious Runoff Depth=2.48"Subcatchment 1S: P1 West Tc=10.0 min CN=80/98 Runoff=2.42 cfs 6,486 cf Runoff Area=78,572 sf 60.03% Impervious Runoff Depth=2.05"Subcatchment 2S: P1 Central Tc=10.0 min CN=80/98 Runoff=5.12 cfs 13,391 cf Runoff Area=21,473 sf 83.31% Impervious Runoff Depth=2.39"Subcatchment 3S: P1 NE Tc=10.0 min CN=80/98 Runoff=1.61 cfs 4,278 cf Runoff Area=2,267 sf 14.07% Impervious Runoff Depth=1.36"Subcatchment 4S: P1 SE Tc=10.0 min CN=80/98 Runoff=0.10 cfs 257 cf Inflow=7.32 cfs 24,412 cfReach 3R: Total Site Outflow=7.32 cfs 24,412 cf Peak Elev=941.66' Storage=1,748 cf Inflow=5.12 cfs 13,391 cfPond 3P: Sand Filter Bed Primary=3.36 cfs 13,391 cf Secondary=0.00 cfs 0 cf Outflow=3.36 cfs 13,391 cf Total Runoff Area = 133,646 sf Runoff Volume = 24,412 cf Average Runoff Depth = 2.19" 30.08% Pervious = 40,206 sf 69.92% Impervious = 93,440 sf Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 7HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: P1 West Runoff=2.42 cfs @ 12.01 hrs, Volume=6,486 cf, Depth=2.48" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 28,06398Paved parking, HSG D 3,27180>75% Grass cover, Good, HSG D 31,33496Weighted Average 3,2718010.44% Pervious Area 28,0639889.56% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 1S: P1 West Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=31,334 sf Runoff Volume=6,486 cf Runoff Depth=2.48" Tc=10.0 min CN=80/98 2.42 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 8HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: P1 Central Runoff=5.12 cfs @ 12.01 hrs, Volume=13,391 cf, Depth=2.05" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 47,16898Paved parking, HSG D 31,40480>75% Grass cover, Good, HSG D 78,57291Weighted Average 31,4048039.97% Pervious Area 47,1689860.03% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 2S: P1 Central Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=78,572 sf Runoff Volume=13,391 cf Runoff Depth=2.05" Tc=10.0 min CN=80/98 5.12 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 9HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: P1 NE Runoff=1.61 cfs @ 12.01 hrs, Volume=4,278 cf, Depth=2.39" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 17,89098Paved parking, HSG D 3,58380>75% Grass cover, Good, HSG D 21,47395Weighted Average 3,5838016.69% Pervious Area 17,8909883.31% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 3S: P1 NE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=21,473 sf Runoff Volume=4,278 cf Runoff Depth=2.39" Tc=10.0 min CN=80/98 1.61 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 10HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: P1 SE Runoff=0.10 cfs @ 12.02 hrs, Volume=257 cf, Depth=1.36" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 31998Paved parking, HSG D 1,94880>75% Grass cover, Good, HSG D 2,26783Weighted Average 1,9488085.93% Pervious Area 3199814.07% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 4S: P1 SE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=2,267 sf Runoff Volume=257 cf Runoff Depth=1.36" Tc=10.0 min CN=80/98 0.10 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 11HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Reach 3R: Total Site [40] Hint: Not Described (Outflow=Inflow) Inflow Area =133,646 sf,69.92% Impervious, Inflow Depth = 2.19" for 2-yr event Inflow=7.32 cfs @ 12.02 hrs, Volume=24,412 cf Outflow=7.32 cfs @ 12.02 hrs, Volume=24,412 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Reach 3R: Total Site Inflow Outflow Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 8 7 6 5 4 3 2 1 0 Inflow Area=133,646 sf 7.32 cfs7.32 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 12HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Pond 3P: Sand Filter Bed Inflow Area =78,572 sf,60.03% Impervious, Inflow Depth = 2.05" for 2-yr event Inflow=5.12 cfs @ 12.01 hrs, Volume=13,391 cf Outflow=3.36 cfs @ 12.10 hrs, Volume=13,391 cf, Atten= 34%, Lag= 5.3 min Primary=3.36 cfs @ 12.10 hrs, Volume=13,391 cf Secondary=0.00 cfs @ 0.00 hrs, Volume=0 cf Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 941.66' @ 12.10 hrs Surf.Area= 2,537 sf Storage= 1,748 cf Plug-Flow detention time= 13.6 min calculated for 13,391 cf (100% of inflow) Center-of-Mass det. time= 13.5 min ( 792.4 - 779.0 ) VolumeInvertAvail.StorageStorage Description #1940.00'28,560 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaVoidsInc.StoreCum.Store (feet)(sq-ft)(%)(cubic-feet)(cubic-feet) 940.004,5000.000 941.504,50020.01,3501,350 941.512,400100.0341,384 947.007,500100.027,17628,560 DeviceRouting InvertOutlet Devices #1Primary940.00'12.0" Round Culvert L= 25.0' RCP, groove end w/headwall, Ke= 0.200 Inlet / Outlet Invert= 940.00' / 939.50' S= 0.0200 '/' Cc= 0.900 n= 0.013, Flow Area= 0.79 sf #2Device 1940.00'6.0" Vert. Orifice/Grate X 3.00 C= 0.600 #3Secondary946.99'10.0' long x 3.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 Coef. (English) 2.44 2.58 2.68 2.67 2.65 2.64 2.64 2.68 2.68 2.72 2.81 2.92 2.97 3.07 3.32 #4Device 1942.00'27.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=3.36 cfs @ 12.10 hrs HW=941.66' (Free Discharge) 1=Culvert (Passes 3.36 cfs of 4.81 cfs potential flow) 2=Orifice/Grate (Orifice Controls 3.36 cfs @ 5.71 fps) 4=Orifice/Grate ( Controls 0.00 cfs) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=940.00' (Free Discharge) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 13HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pond 3P: Sand Filter Bed Inflow Outflow Primary Secondary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 5 4 3 2 1 0 Inflow Area=78,572 sf Peak Elev=941.66' Storage=1,748 cf 5.12 cfs 3.36 cfs3.36 cfs 0.00 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 14HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 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=31,334 sf 89.56% Impervious Runoff Depth=3.85"Subcatchment 1S: P1 West Tc=10.0 min CN=80/98 Runoff=3.70 cfs 10,053 cf Runoff Area=78,572 sf 60.03% Impervious Runoff Depth=3.33"Subcatchment 2S: P1 Central Tc=10.0 min CN=80/98 Runoff=8.28 cfs 21,791 cf Runoff Area=21,473 sf 83.31% Impervious Runoff Depth=3.74"Subcatchment 3S: P1 NE Tc=10.0 min CN=80/98 Runoff=2.48 cfs 6,692 cf Runoff Area=2,267 sf 14.07% Impervious Runoff Depth=2.52"Subcatchment 4S: P1 SE Tc=10.0 min CN=80/98 Runoff=0.19 cfs 475 cf Inflow=11.16 cfs 39,010 cfReach 3R: Total Site Outflow=11.16 cfs 39,010 cf Peak Elev=942.21' Storage=3,294 cf Inflow=8.28 cfs 21,791 cfPond 3P: Sand Filter Bed Primary=5.75 cfs 21,791 cf Secondary=0.00 cfs 0 cf Outflow=5.75 cfs 21,791 cf Total Runoff Area = 133,646 sf Runoff Volume = 39,010 cf Average Runoff Depth = 3.50" 30.08% Pervious = 40,206 sf 69.92% Impervious = 93,440 sf Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 15HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: P1 West Runoff=3.70 cfs @ 12.01 hrs, Volume=10,053 cf, Depth=3.85" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 28,06398Paved parking, HSG D 3,27180>75% Grass cover, Good, HSG D 31,33496Weighted Average 3,2718010.44% Pervious Area 28,0639889.56% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 1S: P1 West Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=31,334 sf Runoff Volume=10,053 cf Runoff Depth=3.85" Tc=10.0 min CN=80/98 3.70 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 16HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: P1 Central Runoff=8.28 cfs @ 12.01 hrs, Volume=21,791 cf, Depth=3.33" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 47,16898Paved parking, HSG D 31,40480>75% Grass cover, Good, HSG D 78,57291Weighted Average 31,4048039.97% Pervious Area 47,1689860.03% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 2S: P1 Central Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=78,572 sf Runoff Volume=21,791 cf Runoff Depth=3.33" Tc=10.0 min CN=80/98 8.28 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 17HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: P1 NE Runoff=2.48 cfs @ 12.01 hrs, Volume=6,692 cf, Depth=3.74" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 17,89098Paved parking, HSG D 3,58380>75% Grass cover, Good, HSG D 21,47395Weighted Average 3,5838016.69% Pervious Area 17,8909883.31% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 3S: P1 NE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=21,473 sf Runoff Volume=6,692 cf Runoff Depth=3.74" Tc=10.0 min CN=80/98 2.48 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 18HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: P1 SE Runoff=0.19 cfs @ 12.02 hrs, Volume=475 cf, Depth=2.52" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 31998Paved parking, HSG D 1,94880>75% Grass cover, Good, HSG D 2,26783Weighted Average 1,9488085.93% Pervious Area 3199814.07% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 4S: P1 SE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=2,267 sf Runoff Volume=475 cf Runoff Depth=2.52" Tc=10.0 min CN=80/98 0.19 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 19HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Reach 3R: Total Site [40] Hint: Not Described (Outflow=Inflow) Inflow Area =133,646 sf,69.92% Impervious, Inflow Depth = 3.50" for 10-yr event Inflow=11.16 cfs @ 12.06 hrs, Volume=39,010 cf Outflow=11.16 cfs @ 12.06 hrs, Volume=39,010 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Reach 3R: Total Site Inflow Outflow Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=133,646 sf 11.16 cfs11.16 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 20HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Pond 3P: Sand Filter Bed Inflow Area =78,572 sf,60.03% Impervious, Inflow Depth = 3.33" for 10-yr event Inflow=8.28 cfs @ 12.01 hrs, Volume=21,791 cf Outflow=5.75 cfs @ 12.09 hrs, Volume=21,791 cf, Atten= 31%, Lag= 4.9 min Primary=5.75 cfs @ 12.09 hrs, Volume=21,791 cf Secondary=0.00 cfs @ 0.00 hrs, Volume=0 cf Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 942.21' @ 12.09 hrs Surf.Area= 3,051 sf Storage= 3,294 cf Plug-Flow detention time= 12.5 min calculated for 21,791 cf (100% of inflow) Center-of-Mass det. time= 12.3 min ( 784.2 - 771.9 ) VolumeInvertAvail.StorageStorage Description #1940.00'28,560 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaVoidsInc.StoreCum.Store (feet)(sq-ft)(%)(cubic-feet)(cubic-feet) 940.004,5000.000 941.504,50020.01,3501,350 941.512,400100.0341,384 947.007,500100.027,17628,560 DeviceRouting InvertOutlet Devices #1Primary940.00'12.0" Round Culvert L= 25.0' RCP, groove end w/headwall, Ke= 0.200 Inlet / Outlet Invert= 940.00' / 939.50' S= 0.0200 '/' Cc= 0.900 n= 0.013, Flow Area= 0.79 sf #2Device 1940.00'6.0" Vert. Orifice/Grate X 3.00 C= 0.600 #3Secondary946.99'10.0' long x 3.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 Coef. (English) 2.44 2.58 2.68 2.67 2.65 2.64 2.64 2.68 2.68 2.72 2.81 2.92 2.97 3.07 3.32 #4Device 1942.00'27.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=5.85 cfs @ 12.09 hrs HW=942.21' (Free Discharge) 1=Culvert (Barrel Controls 5.85 cfs @ 7.45 fps) 2=Orifice/Grate (Passes < 3.97 cfs potential flow) 4=Orifice/Grate (Passes < 2.20 cfs potential flow) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=940.00' (Free Discharge) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 21HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pond 3P: Sand Filter Bed Inflow Outflow Primary Secondary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 9 8 7 6 5 4 3 2 1 0 Inflow Area=78,572 sf Peak Elev=942.21' Storage=3,294 cf 8.28 cfs 5.75 cfs5.75 cfs 0.00 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 22HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 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=31,334 sf 89.56% Impervious Runoff Depth=6.92"Subcatchment 1S: P1 West Tc=10.0 min CN=80/98 Runoff=6.54 cfs 18,074 cf Runoff Area=78,572 sf 60.03% Impervious Runoff Depth=6.30"Subcatchment 2S: P1 Central Tc=10.0 min CN=80/98 Runoff=15.49 cfs 41,274 cf Runoff Area=21,473 sf 83.31% Impervious Runoff Depth=6.79"Subcatchment 3S: P1 NE Tc=10.0 min CN=80/98 Runoff=4.43 cfs 12,152 cf Runoff Area=2,267 sf 14.07% Impervious Runoff Depth=5.34"Subcatchment 4S: P1 SE Tc=10.0 min CN=80/98 Runoff=0.41 cfs 1,009 cf Inflow=18.33 cfs 72,509 cfReach 3R: Total Site Outflow=18.33 cfs 72,509 cf Peak Elev=943.42' Storage=7,660 cf Inflow=15.49 cfs 41,274 cfPond 3P: Sand Filter Bed Primary=7.64 cfs 41,274 cf Secondary=0.00 cfs 0 cf Outflow=7.64 cfs 41,274 cf Total Runoff Area = 133,646 sf Runoff Volume = 72,509 cf Average Runoff Depth = 6.51" 30.08% Pervious = 40,206 sf 69.92% Impervious = 93,440 sf Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 23HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: P1 West Runoff=6.54 cfs @ 12.01 hrs, Volume=18,074 cf, Depth=6.92" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 28,06398Paved parking, HSG D 3,27180>75% Grass cover, Good, HSG D 31,33496Weighted Average 3,2718010.44% Pervious Area 28,0639889.56% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 1S: P1 West Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 7 6 5 4 3 2 1 0 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=31,334 sf Runoff Volume=18,074 cf Runoff Depth=6.92" Tc=10.0 min CN=80/98 6.54 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 24HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: P1 Central Runoff=15.49 cfs @ 12.01 hrs, Volume=41,274 cf, Depth=6.30" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 47,16898Paved parking, HSG D 31,40480>75% Grass cover, Good, HSG D 78,57291Weighted Average 31,4048039.97% Pervious Area 47,1689860.03% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 2S: P1 Central Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=78,572 sf Runoff Volume=41,274 cf Runoff Depth=6.30" Tc=10.0 min CN=80/98 15.49 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 25HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: P1 NE Runoff=4.43 cfs @ 12.01 hrs, Volume=12,152 cf, Depth=6.79" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 17,89098Paved parking, HSG D 3,58380>75% Grass cover, Good, HSG D 21,47395Weighted Average 3,5838016.69% Pervious Area 17,8909883.31% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 3S: P1 NE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=21,473 sf Runoff Volume=12,152 cf Runoff Depth=6.79" Tc=10.0 min CN=80/98 4.43 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 26HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: P1 SE Runoff=0.41 cfs @ 12.01 hrs, Volume=1,009 cf, Depth=5.34" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 31998Paved parking, HSG D 1,94880>75% Grass cover, Good, HSG D 2,26783Weighted Average 1,9488085.93% Pervious Area 3199814.07% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 4S: P1 SE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=2,267 sf Runoff Volume=1,009 cf Runoff Depth=5.34" Tc=10.0 min CN=80/98 0.41 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 27HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Reach 3R: Total Site [40] Hint: Not Described (Outflow=Inflow) Inflow Area =133,646 sf,69.92% Impervious, Inflow Depth = 6.51" for 100-yr event Inflow=18.33 cfs @ 12.02 hrs, Volume=72,509 cf Outflow=18.33 cfs @ 12.02 hrs, Volume=72,509 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Reach 3R: Total Site Inflow Outflow Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=133,646 sf 18.33 cfs18.33 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 28HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Pond 3P: Sand Filter Bed Inflow Area =78,572 sf,60.03% Impervious, Inflow Depth = 6.30" for 100-yr event Inflow=15.49 cfs @ 12.01 hrs, Volume=41,274 cf Outflow=7.64 cfs @ 12.13 hrs, Volume=41,274 cf, Atten= 51%, Lag= 7.2 min Primary=7.64 cfs @ 12.13 hrs, Volume=41,274 cf Secondary=0.00 cfs @ 0.00 hrs, Volume=0 cf Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 943.42' @ 12.13 hrs Surf.Area= 4,174 sf Storage= 7,660 cf Plug-Flow detention time= 12.2 min calculated for 41,274 cf (100% of inflow) Center-of-Mass det. time= 12.0 min ( 774.5 - 762.5 ) VolumeInvertAvail.StorageStorage Description #1940.00'28,560 cf Custom Stage Data (Prismatic) Listed below (Recalc) ElevationSurf.AreaVoidsInc.StoreCum.Store (feet)(sq-ft)(%)(cubic-feet)(cubic-feet) 940.004,5000.000 941.504,50020.01,3501,350 941.512,400100.0341,384 947.007,500100.027,17628,560 DeviceRouting InvertOutlet Devices #1Primary940.00'12.0" Round Culvert L= 25.0' RCP, groove end w/headwall, Ke= 0.200 Inlet / Outlet Invert= 940.00' / 939.50' S= 0.0200 '/' Cc= 0.900 n= 0.013, Flow Area= 0.79 sf #2Device 1940.00'6.0" Vert. Orifice/Grate X 3.00 C= 0.600 #3Secondary946.99'10.0' long x 3.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 Coef. (English) 2.44 2.58 2.68 2.67 2.65 2.64 2.64 2.68 2.68 2.72 2.81 2.92 2.97 3.07 3.32 #4Device 1942.00'27.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=7.64 cfs @ 12.13 hrs HW=943.42' (Free Discharge) 1=Culvert (Barrel Controls 7.64 cfs @ 9.73 fps) 2=Orifice/Grate (Passes < 5.05 cfs potential flow) 4=Orifice/Grate (Passes < 22.79 cfs potential flow) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=940.00' (Free Discharge) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 1 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 29HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pond 3P: Sand Filter Bed Inflow Outflow Primary Secondary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=78,572 sf Peak Elev=943.42' Storage=7,660 cf 15.49 cfs 7.64 cfs7.64 cfs 0.00 cfs 1S P2 West 2S P2 Central 3S P2 NE 4S P2 SE3R Total Site 3P Sand Filter Bed Routing Diagram for VEN20145 - Proposed Hydrocad - PHASE 2 Prepared by Hewlett-Packard Company, Printed 9/4/2014 HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Subcat Reach Pond Link VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 2HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (sq-ft) CNDescription (subcatchment-numbers) 21,99280>75% Grass cover, Good, HSG D (1S, 2S, 3S, 4S) 111,65498Paved parking, HSG D (1S, 2S, 3S, 4S) 133,64695TOTAL AREA VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 3HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (sq-ft) Soil Group Subcatchment Numbers 0HSG A 0HSG B 0HSG C 133,646HSG D1S, 2S, 3S, 4S 0Other 133,646TOTAL AREA VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 4HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 00021,992021,992>75% Grass cover, Good 000111,6540111,654Paved parking 000133,6460133,646TOTAL AREA VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 5HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pipe Listing (selected nodes) Line#Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) nDiam/Width (inches) Height (inches) Inside-Fill (inches) 13P940.00939.5025.00.02000.01312.00.00.0 Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 6HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 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=31,334 sf 89.56% Impervious Runoff Depth=2.48"Subcatchment 1S: P2 West Tc=10.0 min CN=80/98 Runoff=2.42 cfs 6,486 cf Runoff Area=78,572 sf 83.21% Impervious Runoff Depth=2.39"Subcatchment 2S: P2 Central Tc=10.0 min CN=80/98 Runoff=5.87 cfs 15,645 cf Runoff Area=21,473 sf 83.31% Impervious Runoff Depth=2.39"Subcatchment 3S: P2 NE Tc=10.0 min CN=80/98 Runoff=1.61 cfs 4,278 cf Runoff Area=2,267 sf 14.07% Impervious Runoff Depth=1.36"Subcatchment 4S: P2 SE Tc=10.0 min CN=80/98 Runoff=0.10 cfs 257 cf Inflow=7.56 cfs 26,667 cfReach 3R: Total Site Outflow=7.56 cfs 26,667 cf Peak Elev=941.95' Storage=2,153 cf Inflow=5.87 cfs 15,645 cfPond 3P: Sand Filter Bed Outflow=3.70 cfs 15,645 cf Total Runoff Area = 133,646 sf Runoff Volume = 26,667 cf Average Runoff Depth = 2.39" 16.46% Pervious = 21,992 sf 83.54% Impervious = 111,654 sf Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 7HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: P2 West Runoff=2.42 cfs @ 12.01 hrs, Volume=6,486 cf, Depth=2.48" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 28,06398Paved parking, HSG D 3,27180>75% Grass cover, Good, HSG D 31,33496Weighted Average 3,2718010.44% Pervious Area 28,0639889.56% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 1S: P2 West Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=31,334 sf Runoff Volume=6,486 cf Runoff Depth=2.48" Tc=10.0 min CN=80/98 2.42 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 8HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: P2 Central Runoff=5.87 cfs @ 12.01 hrs, Volume=15,645 cf, Depth=2.39" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 65,38298Paved parking, HSG D 13,19080>75% Grass cover, Good, HSG D 78,57295Weighted Average 13,1908016.79% Pervious Area 65,3829883.21% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 2S: P2 Central Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 6 5 4 3 2 1 0 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=78,572 sf Runoff Volume=15,645 cf Runoff Depth=2.39" Tc=10.0 min CN=80/98 5.87 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 9HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: P2 NE Runoff=1.61 cfs @ 12.01 hrs, Volume=4,278 cf, Depth=2.39" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 17,89098Paved parking, HSG D 3,58380>75% Grass cover, Good, HSG D 21,47395Weighted Average 3,5838016.69% Pervious Area 17,8909883.31% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 3S: P2 NE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 1 0 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=21,473 sf Runoff Volume=4,278 cf Runoff Depth=2.39" Tc=10.0 min CN=80/98 1.61 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 10HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: P2 SE Runoff=0.10 cfs @ 12.02 hrs, Volume=257 cf, Depth=1.36" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 2-yr Rainfall=2.87" Area (sf)CNDescription 31998Paved parking, HSG D 1,94880>75% Grass cover, Good, HSG D 2,26783Weighted Average 1,9488085.93% Pervious Area 3199814.07% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 4S: P2 SE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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 Type II 24-hr 2-yr Rainfall=2.87" Runoff Area=2,267 sf Runoff Volume=257 cf Runoff Depth=1.36" Tc=10.0 min CN=80/98 0.10 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 11HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Reach 3R: Total Site [40] Hint: Not Described (Outflow=Inflow) Inflow Area =133,646 sf,83.54% Impervious, Inflow Depth = 2.39" for 2-yr event Inflow=7.56 cfs @ 12.02 hrs, Volume=26,667 cf Outflow=7.56 cfs @ 12.02 hrs, Volume=26,667 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Reach 3R: Total Site Inflow Outflow Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 8 7 6 5 4 3 2 1 0 Inflow Area=133,646 sf 7.56 cfs7.56 cfs Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 12HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Pond 3P: Sand Filter Bed Inflow Area =78,572 sf,83.21% Impervious, Inflow Depth = 2.39" for 2-yr event Inflow=5.87 cfs @ 12.01 hrs, Volume=15,645 cf Outflow=3.70 cfs @ 12.10 hrs, Volume=15,645 cf, Atten= 37%, Lag= 5.6 min Primary=3.70 cfs @ 12.10 hrs, Volume=15,645 cf Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 941.95' @ 12.10 hrs Surf.Area= 8,963 sf Storage= 2,153 cf Plug-Flow detention time= 13.2 min calculated for 15,639 cf (100% of inflow) Center-of-Mass det. time= 13.2 min ( 779.1 - 765.9 ) VolumeInvertAvail.StorageStorage Description #1940.00'1,350 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A941.50'4,150 cf 45.71'W x 97.64'L x 4.00'H Field A 17,851 cf Overall - 7,475 cf Embedded = 10,376 cf x 40.0% Voids #3A942.00'7,475 cf Triton S-29H +Cap x 272 Inside #2 Effective Size= 50.2"W x 36.0"H => 9.83 sf x 2.78'L = 27.3 cf Overall Size= 59.0"W x 36.0"H x 2.95'L with 0.17' Overlap Row Length Adjustment= +0.17' x 9.83 sf x 8 rows Cap Storage= +2.1 cf x 2 x 8 rows = 34.1 cf 12,976 cfTotal Available Storage Storage Group A created with Chamber Wizard ElevationSurf.AreaVoidsInc.StoreCum.Store (feet)(sq-ft)(%)(cubic-feet)(cubic-feet) 940.004,5000.000 941.504,50020.01,3501,350 DeviceRouting InvertOutlet Devices #1Primary940.00'12.0" Round Culvert L= 25.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 940.00' / 939.50' S= 0.0200 '/' Cc= 0.900 n= 0.013, Flow Area= 0.79 sf #2Device 1940.00'6.0" Vert. Orifice/Grate X 3.00 C= 0.600 #3Device 1942.00'12.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=3.70 cfs @ 12.10 hrs HW=941.95' (Free Discharge) 1=Culvert (Passes 3.70 cfs of 5.38 cfs potential flow) 2=Orifice/Grate (Orifice Controls 3.70 cfs @ 6.27 fps) 3=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 13HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pond 3P: Sand Filter Bed - Chamber Wizard Field A Chamber Model = Triton S-29H +Cap Effective Size= 50.2"W x 36.0"H => 9.83 sf x 2.78'L = 27.3 cf Overall Size= 59.0"W x 36.0"H x 2.95'L with 0.17' Overlap Row Length Adjustment= +0.17' x 9.83 sf x 8 rows Cap Storage= +2.1 cf x 2 x 8 rows = 34.1 cf 59.0" Wide + 7.5" Spacing = 66.5" C-C Row Spacing 34 Chambers/Row x 2.78' Long +0.17' Row Adjustment +0.49' Cap Length x 2 = 95.64' Row Length +12.0" End Stone x 2 = 97.64' Base Length 8 Rows x 59.0" Wide + 7.5" Spacing x 7 + 12.0" Side Stone x 2 = 45.71' Base Width 6.0" Base + 36.0" Chamber Height + 6.0" Cover = 4.00' Field Height 272 Chambers x 27.3 cf +0.17' Row Adjustment x 9.83 sf x 8 Rows + 2.1 cf Cap Volume x 2 x 8 Rows = 7,475.0 cf Chamber Storage 17,851.2 cf Field - 7,475.0 cf Chambers = 10,376.2 cf Stone x 40.0% Voids = 4,150.5 cf Stone Storage Chamber Storage + Stone Storage = 11,625.5 cf = 0.267 af Overall Storage Efficiency = 65.1% 272 Chambers 661.2 cy Field 384.3 cy Stone Type II 24-hr 2-yr Rainfall=2.87"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 14HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pond 3P: Sand Filter Bed Inflow Primary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 6 5 4 3 2 1 0 Inflow Area=78,572 sf Peak Elev=941.95' Storage=2,153 cf 5.87 cfs 3.70 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 15HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 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=31,334 sf 89.56% Impervious Runoff Depth=3.85"Subcatchment 1S: P2 West Tc=10.0 min CN=80/98 Runoff=3.70 cfs 10,053 cf Runoff Area=78,572 sf 83.21% Impervious Runoff Depth=3.74"Subcatchment 2S: P2 Central Tc=10.0 min CN=80/98 Runoff=9.06 cfs 24,474 cf Runoff Area=21,473 sf 83.31% Impervious Runoff Depth=3.74"Subcatchment 3S: P2 NE Tc=10.0 min CN=80/98 Runoff=2.48 cfs 6,692 cf Runoff Area=2,267 sf 14.07% Impervious Runoff Depth=2.52"Subcatchment 4S: P2 SE Tc=10.0 min CN=80/98 Runoff=0.19 cfs 475 cf Inflow=10.64 cfs 41,693 cfReach 3R: Total Site Outflow=10.64 cfs 41,693 cf Peak Elev=942.49' Storage=4,031 cf Inflow=9.06 cfs 24,474 cfPond 3P: Sand Filter Bed Outflow=5.14 cfs 24,474 cf Total Runoff Area = 133,646 sf Runoff Volume = 41,693 cf Average Runoff Depth = 3.74" 16.46% Pervious = 21,992 sf 83.54% Impervious = 111,654 sf Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 16HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: P2 West Runoff=3.70 cfs @ 12.01 hrs, Volume=10,053 cf, Depth=3.85" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 28,06398Paved parking, HSG D 3,27180>75% Grass cover, Good, HSG D 31,33496Weighted Average 3,2718010.44% Pervious Area 28,0639889.56% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 1S: P2 West Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=31,334 sf Runoff Volume=10,053 cf Runoff Depth=3.85" Tc=10.0 min CN=80/98 3.70 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 17HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: P2 Central Runoff=9.06 cfs @ 12.01 hrs, Volume=24,474 cf, Depth=3.74" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 65,38298Paved parking, HSG D 13,19080>75% Grass cover, Good, HSG D 78,57295Weighted Average 13,1908016.79% Pervious Area 65,3829883.21% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 2S: P2 Central Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=78,572 sf Runoff Volume=24,474 cf Runoff Depth=3.74" Tc=10.0 min CN=80/98 9.06 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 18HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: P2 NE Runoff=2.48 cfs @ 12.01 hrs, Volume=6,692 cf, Depth=3.74" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 17,89098Paved parking, HSG D 3,58380>75% Grass cover, Good, HSG D 21,47395Weighted Average 3,5838016.69% Pervious Area 17,8909883.31% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 3S: P2 NE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 2 1 0 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=21,473 sf Runoff Volume=6,692 cf Runoff Depth=3.74" Tc=10.0 min CN=80/98 2.48 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 19HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: P2 SE Runoff=0.19 cfs @ 12.02 hrs, Volume=475 cf, Depth=2.52" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 10-yr Rainfall=4.27" Area (sf)CNDescription 31998Paved parking, HSG D 1,94880>75% Grass cover, Good, HSG D 2,26783Weighted Average 1,9488085.93% Pervious Area 3199814.07% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 4S: P2 SE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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 Type II 24-hr 10-yr Rainfall=4.27" Runoff Area=2,267 sf Runoff Volume=475 cf Runoff Depth=2.52" Tc=10.0 min CN=80/98 0.19 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 20HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Reach 3R: Total Site [40] Hint: Not Described (Outflow=Inflow) Inflow Area =133,646 sf,83.54% Impervious, Inflow Depth = 3.74" for 10-yr event Inflow=10.64 cfs @ 12.03 hrs, Volume=41,693 cf Outflow=10.64 cfs @ 12.03 hrs, Volume=41,693 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Reach 3R: Total Site Inflow Outflow Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=133,646 sf 10.64 cfs10.64 cfs Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 21HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Pond 3P: Sand Filter Bed Inflow Area =78,572 sf,83.21% Impervious, Inflow Depth = 3.74" for 10-yr event Inflow=9.06 cfs @ 12.01 hrs, Volume=24,474 cf Outflow=5.14 cfs @ 12.12 hrs, Volume=24,474 cf, Atten= 43%, Lag= 6.3 min Primary=5.14 cfs @ 12.12 hrs, Volume=24,474 cf Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 942.49' @ 12.12 hrs Surf.Area= 8,963 sf Storage= 4,031 cf Plug-Flow detention time= 12.5 min calculated for 24,463 cf (100% of inflow) Center-of-Mass det. time= 12.6 min ( 771.1 - 758.5 ) VolumeInvertAvail.StorageStorage Description #1940.00'1,350 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A941.50'4,150 cf 45.71'W x 97.64'L x 4.00'H Field A 17,851 cf Overall - 7,475 cf Embedded = 10,376 cf x 40.0% Voids #3A942.00'7,475 cf Triton S-29H +Cap x 272 Inside #2 Effective Size= 50.2"W x 36.0"H => 9.83 sf x 2.78'L = 27.3 cf Overall Size= 59.0"W x 36.0"H x 2.95'L with 0.17' Overlap Row Length Adjustment= +0.17' x 9.83 sf x 8 rows Cap Storage= +2.1 cf x 2 x 8 rows = 34.1 cf 12,976 cfTotal Available Storage Storage Group A created with Chamber Wizard ElevationSurf.AreaVoidsInc.StoreCum.Store (feet)(sq-ft)(%)(cubic-feet)(cubic-feet) 940.004,5000.000 941.504,50020.01,3501,350 DeviceRouting InvertOutlet Devices #1Primary940.00'12.0" Round Culvert L= 25.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 940.00' / 939.50' S= 0.0200 '/' Cc= 0.900 n= 0.013, Flow Area= 0.79 sf #2Device 1940.00'6.0" Vert. Orifice/Grate X 3.00 C= 0.600 #3Device 1942.00'12.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=5.13 cfs @ 12.12 hrs HW=942.48' (Free Discharge) 1=Culvert (Passes 5.13 cfs of 6.30 cfs potential flow) 2=Orifice/Grate (Orifice Controls 4.24 cfs @ 7.20 fps) 3=Orifice/Grate (Orifice Controls 0.89 cfs @ 2.37 fps) Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 22HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pond 3P: Sand Filter Bed - Chamber Wizard Field A Chamber Model = Triton S-29H +Cap Effective Size= 50.2"W x 36.0"H => 9.83 sf x 2.78'L = 27.3 cf Overall Size= 59.0"W x 36.0"H x 2.95'L with 0.17' Overlap Row Length Adjustment= +0.17' x 9.83 sf x 8 rows Cap Storage= +2.1 cf x 2 x 8 rows = 34.1 cf 59.0" Wide + 7.5" Spacing = 66.5" C-C Row Spacing 34 Chambers/Row x 2.78' Long +0.17' Row Adjustment +0.49' Cap Length x 2 = 95.64' Row Length +12.0" End Stone x 2 = 97.64' Base Length 8 Rows x 59.0" Wide + 7.5" Spacing x 7 + 12.0" Side Stone x 2 = 45.71' Base Width 6.0" Base + 36.0" Chamber Height + 6.0" Cover = 4.00' Field Height 272 Chambers x 27.3 cf +0.17' Row Adjustment x 9.83 sf x 8 Rows + 2.1 cf Cap Volume x 2 x 8 Rows = 7,475.0 cf Chamber Storage 17,851.2 cf Field - 7,475.0 cf Chambers = 10,376.2 cf Stone x 40.0% Voids = 4,150.5 cf Stone Storage Chamber Storage + Stone Storage = 11,625.5 cf = 0.267 af Overall Storage Efficiency = 65.1% 272 Chambers 661.2 cy Field 384.3 cy Stone Type II 24-hr 10-yr Rainfall=4.27"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 23HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pond 3P: Sand Filter Bed Inflow Primary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=78,572 sf Peak Elev=942.49' Storage=4,031 cf 9.06 cfs 5.14 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 24HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 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=31,334 sf 89.56% Impervious Runoff Depth=6.92"Subcatchment 1S: P2 West Tc=10.0 min CN=80/98 Runoff=6.54 cfs 18,074 cf Runoff Area=78,572 sf 83.21% Impervious Runoff Depth=6.79"Subcatchment 2S: P2 Central Tc=10.0 min CN=80/98 Runoff=16.19 cfs 44,452 cf Runoff Area=21,473 sf 83.31% Impervious Runoff Depth=6.79"Subcatchment 3S: P2 NE Tc=10.0 min CN=80/98 Runoff=4.43 cfs 12,152 cf Runoff Area=2,267 sf 14.07% Impervious Runoff Depth=5.34"Subcatchment 4S: P2 SE Tc=10.0 min CN=80/98 Runoff=0.41 cfs 1,009 cf Inflow=18.62 cfs 75,688 cfReach 3R: Total Site Outflow=18.62 cfs 75,688 cf Peak Elev=943.71' Storage=8,383 cf Inflow=16.19 cfs 44,452 cfPond 3P: Sand Filter Bed Outflow=8.02 cfs 44,452 cf Total Runoff Area = 133,646 sf Runoff Volume = 75,688 cf Average Runoff Depth = 6.80" 16.46% Pervious = 21,992 sf 83.54% Impervious = 111,654 sf Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 25HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: P2 West Runoff=6.54 cfs @ 12.01 hrs, Volume=18,074 cf, Depth=6.92" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 28,06398Paved parking, HSG D 3,27180>75% Grass cover, Good, HSG D 31,33496Weighted Average 3,2718010.44% Pervious Area 28,0639889.56% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 1S: P2 West Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 7 6 5 4 3 2 1 0 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=31,334 sf Runoff Volume=18,074 cf Runoff Depth=6.92" Tc=10.0 min CN=80/98 6.54 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 26HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: P2 Central Runoff=16.19 cfs @ 12.01 hrs, Volume=44,452 cf, Depth=6.79" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 65,38298Paved parking, HSG D 13,19080>75% Grass cover, Good, HSG D 78,57295Weighted Average 13,1908016.79% Pervious Area 65,3829883.21% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 2S: P2 Central Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=78,572 sf Runoff Volume=44,452 cf Runoff Depth=6.79" Tc=10.0 min CN=80/98 16.19 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 27HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: P2 NE Runoff=4.43 cfs @ 12.01 hrs, Volume=12,152 cf, Depth=6.79" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 17,89098Paved parking, HSG D 3,58380>75% Grass cover, Good, HSG D 21,47395Weighted Average 3,5838016.69% Pervious Area 17,8909883.31% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 3S: P2 NE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 4 3 2 1 0 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=21,473 sf Runoff Volume=12,152 cf Runoff Depth=6.79" Tc=10.0 min CN=80/98 4.43 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 28HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: P2 SE Runoff=0.41 cfs @ 12.01 hrs, Volume=1,009 cf, Depth=5.34" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type II 24-hr 100-yr Rainfall=7.38" Area (sf)CNDescription 31998Paved parking, HSG D 1,94880>75% Grass cover, Good, HSG D 2,26783Weighted Average 1,9488085.93% Pervious Area 3199814.07% Impervious Area TcLengthSlopeVelocityCapacityDescription (min)(feet)(ft/ft)(ft/sec)(cfs) 10.0 Direct Entry, Subcatchment 4S: P2 SE Runoff Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 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 Type II 24-hr 100-yr Rainfall=7.38" Runoff Area=2,267 sf Runoff Volume=1,009 cf Runoff Depth=5.34" Tc=10.0 min CN=80/98 0.41 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 29HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Reach 3R: Total Site [40] Hint: Not Described (Outflow=Inflow) Inflow Area =133,646 sf,83.54% Impervious, Inflow Depth = 6.80" for 100-yr event Inflow=18.62 cfs @ 12.02 hrs, Volume=75,688 cf Outflow=18.62 cfs @ 12.02 hrs, Volume=75,688 cf, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Reach 3R: Total Site Inflow Outflow Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=133,646 sf 18.62 cfs18.62 cfs Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 30HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Summary for Pond 3P: Sand Filter Bed Inflow Area =78,572 sf,83.21% Impervious, Inflow Depth = 6.79" for 100-yr event Inflow=16.19 cfs @ 12.01 hrs, Volume=44,452 cf Outflow=8.02 cfs @ 12.13 hrs, Volume=44,452 cf, Atten= 51%, Lag= 7.2 min Primary=8.02 cfs @ 12.13 hrs, Volume=44,452 cf Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 943.71' @ 12.13 hrs Surf.Area= 8,963 sf Storage= 8,383 cf Plug-Flow detention time= 12.5 min calculated for 44,452 cf (100% of inflow) Center-of-Mass det. time= 12.3 min ( 762.1 - 749.8 ) VolumeInvertAvail.StorageStorage Description #1940.00'1,350 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A941.50'4,150 cf 45.71'W x 97.64'L x 4.00'H Field A 17,851 cf Overall - 7,475 cf Embedded = 10,376 cf x 40.0% Voids #3A942.00'7,475 cf Triton S-29H +Cap x 272 Inside #2 Effective Size= 50.2"W x 36.0"H => 9.83 sf x 2.78'L = 27.3 cf Overall Size= 59.0"W x 36.0"H x 2.95'L with 0.17' Overlap Row Length Adjustment= +0.17' x 9.83 sf x 8 rows Cap Storage= +2.1 cf x 2 x 8 rows = 34.1 cf 12,976 cfTotal Available Storage Storage Group A created with Chamber Wizard ElevationSurf.AreaVoidsInc.StoreCum.Store (feet)(sq-ft)(%)(cubic-feet)(cubic-feet) 940.004,5000.000 941.504,50020.01,3501,350 DeviceRouting InvertOutlet Devices #1Primary940.00'12.0" Round Culvert L= 25.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 940.00' / 939.50' S= 0.0200 '/' Cc= 0.900 n= 0.013, Flow Area= 0.79 sf #2Device 1940.00'6.0" Vert. Orifice/Grate X 3.00 C= 0.600 #3Device 1942.00'12.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=8.01 cfs @ 12.13 hrs HW=943.71' (Free Discharge) 1=Culvert (Barrel Controls 8.01 cfs @ 10.20 fps) 2=Orifice/Grate (Passes < 5.27 cfs potential flow) 3=Orifice/Grate (Passes < 4.15 cfs potential flow) Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 31HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pond 3P: Sand Filter Bed - Chamber Wizard Field A Chamber Model = Triton S-29H +Cap Effective Size= 50.2"W x 36.0"H => 9.83 sf x 2.78'L = 27.3 cf Overall Size= 59.0"W x 36.0"H x 2.95'L with 0.17' Overlap Row Length Adjustment= +0.17' x 9.83 sf x 8 rows Cap Storage= +2.1 cf x 2 x 8 rows = 34.1 cf 59.0" Wide + 7.5" Spacing = 66.5" C-C Row Spacing 34 Chambers/Row x 2.78' Long +0.17' Row Adjustment +0.49' Cap Length x 2 = 95.64' Row Length +12.0" End Stone x 2 = 97.64' Base Length 8 Rows x 59.0" Wide + 7.5" Spacing x 7 + 12.0" Side Stone x 2 = 45.71' Base Width 6.0" Base + 36.0" Chamber Height + 6.0" Cover = 4.00' Field Height 272 Chambers x 27.3 cf +0.17' Row Adjustment x 9.83 sf x 8 Rows + 2.1 cf Cap Volume x 2 x 8 Rows = 7,475.0 cf Chamber Storage 17,851.2 cf Field - 7,475.0 cf Chambers = 10,376.2 cf Stone x 40.0% Voids = 4,150.5 cf Stone Storage Chamber Storage + Stone Storage = 11,625.5 cf = 0.267 af Overall Storage Efficiency = 65.1% 272 Chambers 661.2 cy Field 384.3 cy Stone Type II 24-hr 100-yr Rainfall=7.38"VEN20145 - Proposed Hydrocad - PHASE 2 Printed 9/4/2014Prepared by Hewlett-Packard Company Page 32HydroCAD® 10.00 s/n 00887 © 2012 HydroCAD Software Solutions LLC Pond 3P: Sand Filter Bed Inflow Primary Hydrograph Time (hours) 484644424038363432302826242220181614121086420 Fl o w ( c f s ) 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=78,572 sf Peak Elev=943.71' Storage=8,383 cf 16.19 cfs 8.02 cfs Chanhassen Retail September 4, 2014 Stormwater Management Plan Page 7 Appendix C Storm Sewer Spreadsheet MINNESOTA STORM SEWER DESIGN CALCULATIONS DATE:STORM FREQUENCY:10 Years PROJECT NAME:CALCULATIONS BY:MGB PROJECT NUMBER:MN ATLAS 14 REGION: PROJECT CITY: PROJECT COUNTY: PROJECT ENGINEER: Segment C - Coef.I - Intensity Q - Rate Pipe Upstream Structure Downstream Structure CB Pipe CB Pipe CB Pipe Total CB Total CB Pipe Len.Dia.Grade Man's.Vel.Cap.Excess Build Size Drop Build (Ac.)(Ac.)Indiv.Avg.(Min.)(Min.)(Min.)(In/Hr)(In/Hr)(CFS)(CFS)(Ft.)(In.)(%)n (Ft/S)(CFS)Cap. (Ft.)(In.) (Ft.) (Ft.) CBMH 07 CBMH 06 0.14 0.14 0.91 0.91 5.0 0.1 5.1 8.38 8.38 1.1 1.1 25 12 0.50 HDPE 0.010 4.2 3.3 2.2 CBMH 07 946.43 943.29 3.14 27 R-3250-A CBMH 06 946.63 943.16 Invert 3.47 CBMH 06 CBMH 05 0.10 0.24 0.95 0.93 5.0 0.1 5.2 8.38 8.38 0.8 1.9 19 12 0.50 HDPE 0.010 4.2 3.3 1.4 CBMH 06 946.63 943.16 3.47 48 R-3250-A CBMH 05 946.29 943.07 Invert 3.22 CBMH 05 CBMH 04 0.27 0.51 0.82 0.87 5.0 0.2 5.4 8.38 8.38 1.8 3.7 56 15 0.50 HDPE 0.010 4.8 5.9 2.2 CBMH 05 946.29 943.07 3.22 48 R-3250-A CBMH 04 947.34 942.79 Invert 4.55 CBMH 04 CBMH 03 0.05 0.77 0.91 0.87 5.0 0.6 6.0 8.38 8.38 0.4 5.6 169 15 0.50 HDPE 0.010 4.8 5.9 0.4 CBMH 04 947.34 942.79 4.55 48 R-3250-A CBMH 03 950.83 941.94 Invert 8.89 CBMH 03 ECOSTORM 02 0.03 0.80 0.95 0.87 5.0 0.0 6.0 8.38 8.38 0.3 5.8 10 15 1.00 HDPE 0.010 6.8 8.4 2.6 CBMH 03 950.83 941.94 8.89 48 R-3250-A ECOSTORM 02 951.25 941.84 Invert 9.41 ECOSTORM 02 FES 01 0.00 0.80 0.95 0.87 5.0 0.1 6.1 8.38 7.72 0.0 5.4 34 15 1.00 HDPE 0.010 6.8 8.4 3.0 ECOSTORM 02 951.25 941.84 9.41 48 R-3250-A FES 01 941.50 941.50 Invert 0.00 CBMH 08 CBMH 04 0.20 0.20 0.84 0.84 5.0 0.0 5.0 8.38 8.38 1.4 1.4 15 12 1.00 HDPE 0.010 5.9 4.6 3.2 CBMH 08 947.49 943.94 3.55 27 R-3250-A CBMH 04 947.34 943.79 Drop 1.00 3.55 CBMH 09 EX CB 0.25 0.25 0.89 0.89 5.0 0.1 5.1 8.38 8.38 1.8 1.8 32 12 1.00 HDPE 0.010 5.9 4.6 2.8 CBMH 09 949.69 946.22 3.47 27 R-3250-A EX CB 950.45 945.90 Drop 1.00 4.55 A - Trib. Areas Carver Tc - Time of Conc. 09/05/14 Chanhassen Specialty Retail VEN20145 Chanhassen MGB Top Rim InvertStructure South CommentsCastingStructureMatchTop Rim InletFromToMat'l.