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HomeMy WebLinkAboutSmokey Row Road & Monon_Prelim. Drainage Report _DP-PPPreliminary Site Development Hydraulic Report Shrewsberry Project Number 18-0128 Old Town Companies, LLC Smokey Row Road and Monon Smokey Row Road & US 31 (N. MeridianSt.) Carmel, Indiana August 16, 2019 Shrewsberry & Associates 7321 Shadeland Station, Suite 160 Indianapolis, Indiana 46256 317.841.4799 Shrewsberry Proj. Num. 18-0128 March 2019 | Page ii TABLE OF CONTENTS             4.1 Existing Conditions ...................................................................................................... 3  4.2 Proposed Conditions .................................................................................................... 3  4.3 Water Quality .............................................................................................................. 4  TABLES Table 4-1 Summary of Hydraulic Modeling Results APPENDICES Appendix A: Soil Map Appendix B: Proposed Conditons Allowable Runoff Rates Shrewsberry Proj. Num. 18-0128 March 2019 | Page 1 Project Location The site is located in the Southwest Quarter of Section 24, Township 18 North, Range 3 East near the intersection of US 31 (N. Meridian Street) & Smokey Row Road in Carmel, IN. The property is in Clay Township. Smokey Row Road & Monon Shrewsberry Proj. Num. 18-0128 March 2019 | Page 2 Portions of this property are located in flood hazard zones. These areas are shown on Flood Insurance Rate Map (FIRM) number 18057 C0207 G, with an effective date of November 19, 2014. Additional information on these areas is included in the image below. Project Summary Old Town Companies, LLC proposed to develop this area into a mixed used subdivision. The project is known at this time as “Smokey Roe Road & Monon”. The site is bounded by US 31 (N. Meridian St) on the northwest, Smokey Row Road on the south and the Monon Trail on the east. The proposed development covers approximately 27.8 acres and currently consists of 72 parcels. Please refer to the plan sheets that accompany this report for further details on the current development. This report is being presented to provide preliminary storm design calculations for the proposed drainage system and water quantity control facilities. Smokey Row Road & Monon Shrewsberry Proj. Num. 18-0128 March 2019 | Page 3 Soil Information Based on information obtained from the United Stated Department of Agriculture, the soils in the area consist mainly of Miami Silt Loam (MmB2, MmC3) and Shoals Silt Loam (Sh). The Miami Silt Loams are both classified in Hydrologic Soil Group C and the Shoals Silt Loam is classified in Hydrologic Soil Group B/D. Please note, for calculations purposes, each soil will be shown as the next lowest soil group for proposed curve number generation. Please refer to the soils map and listing in Appendix A. Hydrologic Analysis 4.1 Existing Conditions The existing site consists mainly of large residential parcels that are a combination of grassed areas and wooded areas. The existing drainage pattern of the site is from west to east via sheet flow and two existing channels that run from the southeasterly right-of-way of US 31 to Little Cool Creek on the far east end of the site. The channel furthest west on the site is referred to Hunter’s Knoll Drain and the channel further east on the site is an unnamed tributary to Little Cool Creek. Please note, Hunter's Knoll Drain is not a regulated drain south of the US 31 right-of-way. The site is currently being evaluated for “Waters of the US” status by another subconsultant of Old Town Companies. Any impacts to, or required mitigation of, these areas will be addressed at a later date. Currently, It is the intent of this development to relocate a portion of the unnamed tributary to Little Cool Creek to accommodate the proposed development and storm drainage facilities. Specific design requirements and necessary permitting will also be addressed at a later date. 4.2 Proposed Conditions The site will be split into a West Drainage Area and a Northeast Drainage Area. Runoff from the West Drainage Area will be collected and conveyed to four separate storage areas. These areas will be a combination of dry detention basins and underground storage via storm chambers and gravel bed. The outfall from this area will be to Hunter’s Knoll Drain. Runoff from the Northeast Drainage Area will be collected and conveyed to three separate storage areas, also a combination of dry detention basins and underground storm chambers and gravel bed. The outfall from this area will be to the relocated unnamed tributary to Little Cool Creek. Per city ordinance, the allowable runoff from the developed site will be limited to 0.10 cfs/acre for the 10-year storm and 0.30 cfs/acres for the 100-year storm. For the purposes of this preliminary report, only the 100-year storm calculations have been provided to provide adequate storage for the developed site. Two-stage outlets for each area will be included in the final drainage report for the site. Shrewsberry Proj. Num. 18-0128 March 2019 | Page 4 Please note, the calculations show the storage area outlets as “exfiltration”. This was done only for modeling purposes to limit each area to its allowable 100-year release rate. Table 4-1 - Proposed Conditions Allowable Runoff Rates Basin Name Area (ac.) 10-yr Allowable Release Rate (cfs) 100-yr Allowable Release Rate (cfs) West Area 1 1.31 0.131 0.393 West Area 2 1.16 0.116 0.348 West Area 3 4.69 0.469 1.41 West Area 4 3.28 0.328 0.984 NE Area 1 1.77 0.177 0.531 NE Area 2 3.30 0.330 0.990 NE Area 3 1.50 0.150 0.450 4.3 Water Quality Water quality calculations have not been included in this report. However, the final design will include a combination of bioswale areas, mechanical treatment units (swirl chambers), and extended detention as methods to meet the requirements for water quality treatment of the proposed runoff. Shrewsberry Proj. Num. 18-0128 i March 2019 | App. Page i APPENDIX A Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/19/2019 Page 1 of 344264204426510442660044266904426780442687044269604426420442651044266004426690442678044268704426960573430573520573610573700573790573880573970574060574150574240574330 573430 573520 573610 573700 573790 573880 573970 574060 574150 574240 574330 39° 59' 23'' N 86° 8' 24'' W39° 59' 23'' N86° 7' 45'' W39° 59' 4'' N 86° 8' 24'' W39° 59' 4'' N 86° 7' 45'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 16N WGS84 0 200 400 800 1200 Feet 0 50 100 200 300 Meters Map Scale: 1:4,170 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:15,800. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Hamilton County, Indiana Survey Area Data: Version 19, Sep 7, 2018 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Aug 1, 2018—Sep 30, 2018 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/19/2019 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI Br Brookston silty clay loam, 0 to 2 percent slopes 8.1 9.6% CrA Crosby silt loam, fine-loamy subsoil, 0 to 2 percent slopes 15.5 18.3% MmB2 Miami silt loam, 2 to 6 percent slopes, eroded 31.2 36.8% MmC2 Miami silt loam, 6 to 12 percent slopes, eroded 14.5 17.1% MmD2 Miami silt loam, 12 to 18 percent slopes, eroded 3.0 3.5% MoC3 Miami clay loam, 6 to 12 percent slopes, severely eroded 0.0 0.0% Sh Shoals silt loam, 0 to 2 percent slopes, frequently flooded, brief duration 12.4 14.6% Totals for Area of Interest 84.7 100.0% Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/19/2019 Page 3 of 3 Shrewsberry Proj. Num. 18-0128 ii March 2019 | App. Page ii APPENDIX B Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Summary for Pond 13P: WEST DRAIN AREA - POND 1 Inflow Area = 1.308 ac, 89.67% Impervious, Inflow Depth = 5.99" for 100-yr event Inflow = 12.07 cfs @ 11.95 hrs, Volume= 0.652 af Outflow = 0.39 cfs @ 10.55 hrs, Volume= 0.652 af, Atten= 97%, Lag= 0.0 min Primary = 0.39 cfs @ 10.55 hrs, Volume= 0.652 af Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 848.34' @ 13.63 hrs Surf.Area= 6,305 sf Storage= 13,775 cf Plug-Flow detention time= 294.8 min calculated for 0.652 af (100% of inflow) Center-of-Mass det. time= 294.8 min ( 1,046.6 - 751.8 ) Volume Invert Avail.Storage Storage Description #1 846.00' 5,354 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 843.50' 1,631 cf 11.00'W x 110.42'L x 4.50'H Field A 5,466 cf Overall - 1,387 cf Embedded = 4,078 cf x 40.0% Voids #3A 845.00' 1,387 cf ADS_StormTech DC-780 +Cap x 30 Inside #2 Effective Size= 45.4"W x 30.0"H => 6.49 sf x 7.12'L = 46.2 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 30 Chambers in 2 Rows #4B 843.50' 2,152 cf 15.75'W x 103.30'L x 4.50'H Field B 7,321 cf Overall - 1,942 cf Embedded = 5,379 cf x 40.0% Voids #5B 845.00' 1,942 cf ADS_StormTech DC-780 +Cap x 42 Inside #4 Effective Size= 45.4"W x 30.0"H => 6.49 sf x 7.12'L = 46.2 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 42 Chambers in 3 Rows #6C 843.50' 1,566 cf 15.75'W x 74.82'L x 4.50'H Field C 5,303 cf Overall - 1,387 cf Embedded = 3,915 cf x 40.0% Voids #7C 845.00' 1,387 cf ADS_StormTech DC-780 +Cap x 30 Inside #6 Effective Size= 45.4"W x 30.0"H => 6.49 sf x 7.12'L = 46.2 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 30 Chambers in 3 Rows 15,419 cf Total Available Storage Storage Group A created with Chamber Wizard Storage Group B created with Chamber Wizard Storage Group C created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 846.00 953 0 0 847.00 1,459 1,206 1,206 848.00 2,059 1,759 2,965 849.00 2,718 2,389 5,354 Device Routing Invert Outlet Devices #1 Primary 843.50'0.39 cfs Exfiltration at all elevations Primary OutFlow Max=0.39 cfs @ 10.55 hrs HW=843.56' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.39 cfs) Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Pond 13P: WEST DRAIN AREA - POND 1 InflowPrimary Hydrograph Time (hours)4847464544434241403938373635343332313029282726252423222120191817161514131211109876543210Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=1.308 ac Inflow=12.07 cfs @ 11.95 hrs Primary=0.39 cfs @ 10.55 hrs Peak Elev=848.34' Storage=13,775 cf 12.07 cfs @ 11.95 hrs 0.39 cfs @ 10.55 hrs Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Summary for Pond 15P: WEST DRAIN AREA - POND 2 Inflow Area = 1.156 ac, 80.85% Impervious, Inflow Depth = 5.87" for 100-yr event Inflow = 9.97 cfs @ 11.98 hrs, Volume= 0.566 af Outflow = 0.25 cfs @ 10.10 hrs, Volume= 0.566 af, Atten= 97%, Lag= 0.0 min Primary = 0.25 cfs @ 10.10 hrs, Volume= 0.566 af Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 829.26' @ 14.61 hrs Surf.Area= 5,069 sf Storage= 13,343 cf Plug-Flow detention time= 470.2 min calculated for 0.565 af (100% of inflow) Center-of-Mass det. time= 470.3 min ( 1,229.4 - 759.0 ) Volume Invert Avail.Storage Storage Description #1 826.50' 22,177 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 826.50 2,535 0 0 827.00 5,069 1,901 1,901 828.00 5,069 5,069 6,970 829.00 5,069 5,069 12,039 830.00 5,069 5,069 17,108 831.00 5,069 5,069 22,177 Device Routing Invert Outlet Devices #1 Primary 826.50'0.25 cfs Exfiltration at all elevations Primary OutFlow Max=0.25 cfs @ 10.10 hrs HW=826.55' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.25 cfs) Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Pond 15P: WEST DRAIN AREA - POND 2 InflowPrimary Hydrograph Time (hours)4847464544434241403938373635343332313029282726252423222120191817161514131211109876543210Flow (cfs)11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=1.156 ac Inflow=9.97 cfs @ 11.98 hrs Primary=0.25 cfs @ 10.10 hrs Peak Elev=829.26' Storage=13,343 cf 9.97 cfs @ 11.98 hrs 0.25 cfs @ 10.10 hrs Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Summary for Pond 17P: WEST DRAIN AREA - POND 3 Inflow Area = 4.693 ac, 62.83% Impervious, Inflow Depth = 5.41" for 100-yr event Inflow = 38.96 cfs @ 11.98 hrs, Volume= 2.115 af Outflow = 1.41 cfs @ 10.85 hrs, Volume= 2.115 af, Atten= 96%, Lag= 0.0 min Primary = 1.41 cfs @ 10.85 hrs, Volume= 2.115 af Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 827.68' @ 13.60 hrs Surf.Area= 11,936 sf Storage= 45,425 cf Plug-Flow detention time= 280.5 min calculated for 2.113 af (100% of inflow) Center-of-Mass det. time= 280.4 min ( 1,056.7 - 776.3 ) Volume Invert Avail.Storage Storage Description #1 822.00' 49,370 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 822.00 3,991 0 0 823.00 5,435 4,713 4,713 824.00 6,935 6,185 10,898 825.00 8,243 7,589 18,487 826.00 9,589 8,916 27,403 827.00 10,974 10,282 37,685 828.00 12,397 11,686 49,370 Device Routing Invert Outlet Devices #1 Primary 822.00'1.41 cfs Exfiltration at all elevations Primary OutFlow Max=1.41 cfs @ 10.85 hrs HW=822.06' (Free Discharge) 1=Exfiltration (Exfiltration Controls 1.41 cfs) Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Pond 17P: WEST DRAIN AREA - POND 3 InflowPrimary Hydrograph Time (hours)4847464544434241403938373635343332313029282726252423222120191817161514131211109876543210Flow (cfs)42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=4.693 ac Inflow=38.96 cfs @ 11.98 hrs Primary=1.41 cfs @ 10.85 hrs Peak Elev=827.68' Storage=45,425 cf 38.96 cfs @ 11.98 hrs 1.41 cfs @ 10.85 hrs Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Summary for Pond 19P: WEST DRAIN AREA - POND 4 Inflow Area = 3.284 ac, 67.60% Impervious, Inflow Depth = 5.52" for 100-yr event Inflow = 27.57 cfs @ 11.98 hrs, Volume= 1.511 af Outflow = 0.99 cfs @ 10.80 hrs, Volume= 1.511 af, Atten= 96%, Lag= 0.0 min Primary = 0.99 cfs @ 10.80 hrs, Volume= 1.511 af Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 832.92' @ 13.60 hrs Surf.Area= 9,042 sf Storage= 32,372 cf Plug-Flow detention time= 282.5 min calculated for 1.510 af (100% of inflow) Center-of-Mass det. time= 282.4 min ( 1,054.9 - 772.4 ) Volume Invert Avail.Storage Storage Description #1 827.00' 42,944 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 827.00 2,530 0 0 828.00 3,349 2,940 2,940 829.00 4,283 3,816 6,756 830.00 5,332 4,808 11,563 831.00 6,499 5,916 17,479 832.00 7,775 7,137 24,616 833.00 9,149 8,462 33,078 834.00 10,584 9,867 42,944 Device Routing Invert Outlet Devices #1 Primary 827.00'0.99 cfs Exfiltration at all elevations Primary OutFlow Max=0.99 cfs @ 10.80 hrs HW=827.07' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.99 cfs) Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Pond 19P: WEST DRAIN AREA - POND 4 InflowPrimary Hydrograph Time (hours)4847464544434241403938373635343332313029282726252423222120191817161514131211109876543210Flow (cfs)30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=3.284 ac Inflow=27.57 cfs @ 11.98 hrs Primary=0.99 cfs @ 10.80 hrs Peak Elev=832.92' Storage=32,372 cf 27.57 cfs @ 11.98 hrs 0.99 cfs @ 10.80 hrs Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Summary for Pond 21P: NE DRAIN AREA - POND 1 Inflow Area = 1.768 ac, 66.99% Impervious, Inflow Depth = 5.52" for 100-yr event Inflow = 14.84 cfs @ 11.98 hrs, Volume= 0.814 af Outflow = 0.53 cfs @ 10.75 hrs, Volume= 0.814 af, Atten= 96%, Lag= 0.0 min Primary = 0.53 cfs @ 10.75 hrs, Volume= 0.814 af Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 829.27' @ 13.61 hrs Surf.Area= 6,977 sf Storage= 17,437 cf Plug-Flow detention time= 284.2 min calculated for 0.813 af (100% of inflow) Center-of-Mass det. time= 284.1 min ( 1,056.6 - 772.4 ) Volume Invert Avail.Storage Storage Description #1 825.00' 22,930 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 825.00 1,456 0 0 826.00 2,561 2,009 2,009 827.00 3,846 3,204 5,212 828.00 5,188 4,517 9,729 829.00 6,586 5,887 15,616 830.00 8,041 7,314 22,930 Device Routing Invert Outlet Devices #1 Primary 825.00'0.53 cfs Exfiltration at all elevations Primary OutFlow Max=0.53 cfs @ 10.75 hrs HW=825.05' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.53 cfs) Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Pond 21P: NE DRAIN AREA - POND 1 InflowPrimary Hydrograph Time (hours)4847464544434241403938373635343332313029282726252423222120191817161514131211109876543210Flow (cfs)16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=1.768 ac Inflow=14.84 cfs @ 11.98 hrs Primary=0.53 cfs @ 10.75 hrs Peak Elev=829.27' Storage=17,437 cf 14.84 cfs @ 11.98 hrs 0.53 cfs @ 10.75 hrs Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Summary for Pond 23P: NE DRAIN AREA - POND 2 Inflow Area = 3.298 ac, 55.74% Impervious, Inflow Depth = 5.29" for 100-yr event Inflow = 27.04 cfs @ 11.98 hrs, Volume= 1.455 af Outflow = 0.99 cfs @ 10.90 hrs, Volume= 1.455 af, Atten= 96%, Lag= 0.0 min Primary = 0.99 cfs @ 10.90 hrs, Volume= 1.455 af Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 823.87' @ 13.59 hrs Surf.Area= 8,349 sf Storage= 31,276 cf Plug-Flow detention time= 276.9 min calculated for 1.453 af (100% of inflow) Center-of-Mass det. time= 276.8 min ( 1,056.7 - 779.9 ) Volume Invert Avail.Storage Storage Description #1 818.00' 32,359 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 818.00 2,660 0 0 819.00 3,463 3,062 3,062 820.00 4,345 3,904 6,966 821.00 5,297 4,821 11,787 822.00 6,306 5,802 17,588 823.00 7,371 6,839 24,427 824.00 8,493 7,932 32,359 Device Routing Invert Outlet Devices #1 Primary 818.00'0.99 cfs Exfiltration at all elevations Primary OutFlow Max=0.99 cfs @ 10.90 hrs HW=818.06' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.99 cfs) Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Pond 23P: NE DRAIN AREA - POND 2 InflowPrimary Hydrograph Time (hours)4847464544434241403938373635343332313029282726252423222120191817161514131211109876543210Flow (cfs)30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=3.298 ac Inflow=27.04 cfs @ 11.98 hrs Primary=0.99 cfs @ 10.90 hrs Peak Elev=823.87' Storage=31,276 cf 27.04 cfs @ 11.98 hrs 0.99 cfs @ 10.90 hrs Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Summary for Pond 29P: NE DRAIN AREA - POND 3 Inflow Area = 1.495 ac, 82.49% Impervious, Inflow Depth = 5.87" for 100-yr event Inflow = 12.89 cfs @ 11.98 hrs, Volume= 0.731 af Outflow = 0.45 cfs @ 10.65 hrs, Volume= 0.731 af, Atten= 97%, Lag= 0.0 min Primary = 0.45 cfs @ 10.65 hrs, Volume= 0.731 af Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs Peak Elev= 823.44' @ 13.63 hrs Surf.Area= 6,475 sf Storage= 15,513 cf Plug-Flow detention time= 290.7 min calculated for 0.730 af (100% of inflow) Center-of-Mass det. time= 290.6 min ( 1,049.6 - 759.0 ) Volume Invert Avail.Storage Storage Description #1A 819.00' 8,973 cf 6.25'W x 1,036.02'L x 4.50'H Field A 29,138 cf Overall - 6,705 cf Embedded = 22,433 cf x 40.0% Voids #2A 820.50' 6,705 cf ADS_StormTech DC-780 +Cap x 145 Inside #1 Effective Size= 45.4"W x 30.0"H => 6.49 sf x 7.12'L = 46.2 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 15,678 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 819.00'0.45 cfs Exfiltration at all elevations Primary OutFlow Max=0.45 cfs @ 10.65 hrs HW=819.05' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.45 cfs) Type II 24-hr 100-yr Rainfall=6.46", Smoothing=OnDesign Calcs Printed 8/19/2019Prepared by Shrewsberry HydroCAD® 10.00-25 s/n 10118 © 2019 HydroCAD Software Solutions LLC Pond 29P: NE DRAIN AREA - POND 3 InflowPrimary Hydrograph Time (hours)4847464544434241403938373635343332313029282726252423222120191817161514131211109876543210Flow (cfs)14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=1.495 ac Inflow=12.89 cfs @ 11.98 hrs Primary=0.45 cfs @ 10.65 hrs Peak Elev=823.44' Storage=15,513 cf 12.89 cfs @ 11.98 hrs 0.45 cfs @ 10.65 hrs