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23A-068 Post Dev HydroCAD Report Drywell and CB1 InletType III 24-hr 2-Year Event Rainfall=3.00"Post-Development Printed 1/13/2014Prepared by T Reynolds Engineering Page 1HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Summary for Pond 5P: Dry Well Inflow Area = 3,744 sf,100.00% Impervious, Inflow Depth > 2.72" for 2-Year Event event Inflow = 0.24 cfs @ 12.09 hrs, Volume= 849 cf Outflow = 0.09 cfs @ 12.33 hrs, Volume= 849 cf, Atten= 62%, Lag= 14.5 min Discarded = 0.04 cfs @ 12.33 hrs, Volume= 813 cf Primary = 0.05 cfs @ 12.33 hrs, Volume= 36 cf Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 273.13' @ 12.33 hrs Surf.Area= 64 sf Storage= 253 cf Flood Elev= 276.90' Surf.Area= 64 sf Storage= 385 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 48.2 min ( 815.2 - 767.0 ) Volume Invert Avail.Storage Storage Description #1 269.50' 302 cf 8.00'D x 6.00'H Vertical Cone/Cylinder Inside #2 #2 267.50' 83 cf 9.00'D x 8.00'H Vertical Cone/Cylinder 509 cf Overall - 302 cf Embedded = 207 cf x 40.0% Voids 385 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 267.50'8.340 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 265.00' Phase-In= 0.01' #2 Primary 273.00'8.0" Round Culvert L= 8.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 273.00' / 272.90' S= 0.0125 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.35 sf Discarded OutFlow Max=0.04 cfs @ 12.33 hrs HW=273.13' (Free Discharge) 1=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=0.05 cfs @ 12.33 hrs HW=273.13' TW=272.50' (Dynamic Tailwater) 2=Culvert (Barrel Controls 0.05 cfs @ 1.64 fps) Summary for Pond 10P: PCB #1 Grate Inflow Area = 11,221 sf, 85.22% Impervious, Inflow Depth = 1.90" for 2-Year Event event Inflow = 0.56 cfs @ 12.09 hrs, Volume= 1,776 cf Outflow = 0.56 cfs @ 12.09 hrs, Volume= 1,776 cf, Atten= 0%, Lag= 0.0 min Primary = 0.56 cfs @ 12.09 hrs, Volume= 1,776 cf Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 276.83' @ 12.09 hrs Surf.Area= 11 sf Storage= 0 cf Flood Elev= 277.10' Surf.Area= 200 sf Storage= 17 cf Plug-Flow detention time= 0.0 min calculated for 1,775 cf (100% of inflow) Center-of-Mass det. time= 0.0 min ( 813.7 - 813.7 ) Type III 24-hr 2-Year Event Rainfall=3.00"Post-Development Printed 1/13/2014Prepared by T Reynolds Engineering Page 2HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Volume Invert Avail.Storage Storage Description #1 276.80' 17 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 276.80 4 0 0 277.00 45 5 5 277.10 200 12 17 Device Routing Invert Outlet Devices #1 Primary 276.80'2.5" x 2.5" Horiz. Orifice/Grate X 6.00 columns X 6 rows C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.55 cfs @ 12.09 hrs HW=276.83' (Free Discharge) 1=Orifice/Grate (Weir Controls 0.55 cfs @ 0.58 fps) Type III 24-hr 100-Year Event Rainfall=6.50"Post-Development Printed 1/13/2014Prepared by T Reynolds Engineering Page 3HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Summary for Pond 5P: Dry Well Inflow Area = 3,744 sf,100.00% Impervious, Inflow Depth > 6.07" for 100-Year Event event Inflow = 0.53 cfs @ 12.09 hrs, Volume= 1,893 cf Outflow = 0.53 cfs @ 12.10 hrs, Volume= 1,893 cf, Atten= 0%, Lag= 0.6 min Discarded = 0.04 cfs @ 12.10 hrs, Volume= 1,308 cf Primary = 0.49 cfs @ 12.10 hrs, Volume= 585 cf Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 273.46' @ 12.10 hrs Surf.Area= 64 sf Storage= 271 cf Flood Elev= 276.90' Surf.Area= 64 sf Storage= 385 cf Plug-Flow detention time= 41.7 min calculated for 1,893 cf (100% of inflow) Center-of-Mass det. time= 41.6 min ( 802.7 - 761.1 ) Volume Invert Avail.Storage Storage Description #1 269.50' 302 cf 8.00'D x 6.00'H Vertical Cone/Cylinder Inside #2 #2 267.50' 83 cf 9.00'D x 8.00'H Vertical Cone/Cylinder 509 cf Overall - 302 cf Embedded = 207 cf x 40.0% Voids 385 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 267.50'8.340 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 265.00' Phase-In= 0.01' #2 Primary 273.00'8.0" Round Culvert L= 8.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 273.00' / 272.90' S= 0.0125 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.35 sf Discarded OutFlow Max=0.04 cfs @ 12.10 hrs HW=273.46' (Free Discharge) 1=Exfiltration ( Controls 0.04 cfs) Primary OutFlow Max=0.49 cfs @ 12.10 hrs HW=273.46' TW=272.80' (Dynamic Tailwater) 2=Culvert (Barrel Controls 0.49 cfs @ 2.68 fps) Summary for Pond 10P: PCB #1 Grate Inflow Area = 11,221 sf, 85.22% Impervious, Inflow Depth > 5.21" for 100-Year Event event Inflow = 1.47 cfs @ 12.09 hrs, Volume= 4,873 cf Outflow = 1.47 cfs @ 12.09 hrs, Volume= 4,873 cf, Atten= 0%, Lag= 0.0 min Primary = 1.47 cfs @ 12.09 hrs, Volume= 4,873 cf Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 276.86' @ 12.09 hrs Surf.Area= 16 sf Storage= 1 cf Flood Elev= 277.10' Surf.Area= 200 sf Storage= 17 cf Plug-Flow detention time= 0.0 min calculated for 4,870 cf (100% of inflow) Center-of-Mass det. time= 0.0 min ( 786.5 - 786.5 ) Type III 24-hr 100-Year Event Rainfall=6.50"Post-Development Printed 1/13/2014Prepared by T Reynolds Engineering Page 4HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Volume Invert Avail.Storage Storage Description #1 276.80' 17 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 276.80 4 0 0 277.00 45 5 5 277.10 200 12 17 Device Routing Invert Outlet Devices #1 Primary 276.80'2.5" x 2.5" Horiz. Orifice/Grate X 6.00 columns X 6 rows C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.43 cfs @ 12.09 hrs HW=276.86' (Free Discharge) 1=Orifice/Grate (Weir Controls 1.43 cfs @ 0.80 fps)