1001 SHUKSAN WAY 2016-01-01 MF Import

I ' � . ( The WaterWorks input and output 51es can be found in Appendix A• The results are as follow: I Desien Storms Pre-Develoned Conditions ��r�aM� �nnditions O Allowabk Q(2-year storm) 0.45 cfs 9.35 cfs �•ZZ cfs Q(10-year storm) 1.08 cfs 14.36 cfs l.O8 cfs � Q (100-year storm) 2.66 cfs 21.55 cfs 2•66 cfs I �Requln�d Detention Yolume � Live Sto��ae The required volume of the detention pond for the 100-year storm event is 5.02 acre fat as r sh.:wn below in the level pool routing table. IWaterWorks Level Pool Table Summary IMatch in.�low Controlled Peak Volume De.cSriotion Dischaz¢e(cfs) Sta ac - ` 1/2 of 2-ycaz 0.22 521.61 3.09 � 10-year 1.08 52�.73 4.22 1pp-yeaz 2.66 523.48 5.02 IA factor of safety of 1.45 times the calculated 10(?-yeaz developed conditions runoff volume was I used to size the detention pond. The stage/storage:tablc for the enlarged detention pond is as follows: IVolume of the Gve storage at elevation 517.5 = 0.00 acre-ft Volume of the live storage at elevation 518.0= 0.42 acre-ft Volume of the live storage at el��•atior, 520.0= 2.44 acre-ft ' Volume of the live storage at elevation:;?2.0 = SA2 acre-k Volume of the Gve storage at elevation�24.0= 8.15 acre-ft Volume of the Gve storage at elevation 525.0= 9.93 acre-ft � IDead Stora�e The dead storage volume requ'ved for the cietention pond is 85,856 cubic feet (1.97 ac-R). This is I calculated using the 6-month, 24-hour storm event. The two open water cells have a combined volume of 71,768 cubic feet, or 83.6 percent of the total dead storage volume. The wetla� treatment cell has a volume of 13,604 cubic feet, or 15.8 perxnt of the total dead storage Ivolume. ( � Food Services of America Stamwatcr Site Plan and Stamwata Ddrntian Pond IHydraulic Report '6� �Q