11-20-2017 Planning Commission Packet

Home Browse Search

IVY PLACE - PROPOSED CONDITIONS 17059 - IVY PLACE - PROPOSED Type 1124-hr 10-YEAR Rainfall=4.24" Prepared by Microsoft Printed 7/17/2017 HydroCAD® 10.00-19 s/n 02202 ©2016 HydroCAD Software Solutions LLC Page 24 Summary for Pond 1P: UNDERGROUND FILT DET POND 1 Inflow Area = 0.119 ac, 50.51% Impervious, Inflow Depth > 2.85" for 10-YEAR event Inflow = 0.62 cfs @ 11.97 hrs, Volume= 0.028 af Outflow = 0.46 cfs @ 12.03 hrs, Volume= 0.028 af, Atten= 26%, Lag= 3.5 min Primary = 0.46 cfs @ 12.03 hrs, Volume= 0.028 af Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 930.66' @ 12.03 hrs Surf.Area= 704 sf Storage= 288 cf Plug-Flow detention time= 32.8 min calculated for 0.028 af(98% of inflow) Center-of-Mass det. time= 24.0 min ( 785.2 - 761.2 ) Volume Invert Avail.Storage Storage Description #1A 930.00' 323 cf 11.00'W x 64.00'L x 1.50'H Field A 1,056 cf Overall -248 cf Embedded = 808 cf x 40.0%Voids #2A 930.00' 248 cf CMP Round 12 x 15 Inside#1 Effective Size= 12.0"W x 12.0"H => 0.78 sf x 20.00'L = 15.6 cf Overall Size= 12.0"W x 12.0"H x 20.00'L 5 Rows of 3 Chambers 9.00' Header x 0.78 sf x 2 = 14.0 cf Inside 571 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 930.00' 2.0" Round Culvert L= 26.0' RCP, square edge headwall, Ke= 0.500 Inlet/Outlet Invert= 930.00'/929.77' S= 0.0088 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.02 sf #2 Primary 930.25' 4.0" Round Culvert X 2.00 L= 26.0' RCP, square edge headwall, Ke= 0.500 Inlet/Outlet Invert= 930.25' / 929.77' S= 0.0185 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.09 sf Primary OutFlow Max=0.46 cfs @ 12.03 hrs HW=930.66' (Free Discharge) 'E1=Culvert (Barrel Controls 0.05 cfs @ 2.11 fps) 2=Culvert (Inlet Controls 0.41 cfs © 2.35 fps)