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T:\0742\1406\June11 CityApp\Surface Water\ ER Landfill 06_2011-dead storage affect Type 11 24-hr 900 yr Rainfall=5.90" Prepared by Wenck Associates, Inc. Printed 8/15/2011 HydroCAD® 9.10 s/n 02201 ©2010 HydroCAD Software Solutions LLC Page 71 Summary for Pond 26P: Wetland west of RR trail, NW of S Expansion Inflow Area = 53.329 ac, 0.23% Impervious, Inflow Depth > 2.86" for 100 yr event Inflow = 18.38 cfs @ .12.30 hrs, Volume= 12.726 of Outflow = 11.18 cfs @ 17.16 hrs, Volume= 12.718 af, Atten= 39%, Lag= 291.7 min Primary = 5.59 cfs @ 17.16 hrs, Volume= 6.359 of Secondary. = 5.59 cfs @ 17.16 hrs, Volume= 6.359 of Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.02 hrs Starting Elev= 955.76' Surf.Area= 1.135 ac Storage= 0.562 of Peak Elev= 956.41' @ 17.16 hrs Surf.Area= 1.949 ac Storage= 1.551 of (0.989 of above start) Plug-Flow detention time= 166.3 min calculated for 12.154 of (96% of inflow) Center-of--Mass det. time= 71.2 min (1,266.2 - 1,195.0 ) Volume Invert Avail.Storage Storage Description #1 954.77' 6.337 of Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 954.77 0.000 0.000 0.000 956.00 1.410 0.867 0.867 958.00 4.060 5.470 6.337 Device Routing Invert Outlet Devices #1 Primary 955.76' 4.0' long x 20.0' breadth south weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 #2 Secondary 955.76' 4.0' long x 20.0' breadth north weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63 Primary OutFlow Max=5.59 cfs @ 17.16 hrs HW=956.41' (Free Discharge) t1=south weir (Weir Controls 5.59 cfs @ 2.16 fps) Secondary OutFlow Max=5.59 cfs @ 17.16 hrs HW=956.41' (Free Discharge) 2=north weir (Weir Controls 5.59 cfs @ 2.16 fps)