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1 <br /> Western Washington Hydrology Model <br /> PROJECT REPORT <br /> Southern Parking Area <br /> ' Project Name: PMGC-2 <br /> Site Address: 23rd Dr W <br /> City : Everett, WA <br /> Report Date 7/7/2011 <br /> Gage Everett <br /> Data Start 1948/10/01 <br /> Data End 1997/09/30 <br /> Precip Scale: 0.80 <br /> WWHM3 Pro Version: <br /> MITIGATED LAND USE <br /> Name : Basin 1 <br /> Bypass: No <br /> GroundWater: No <br /> Pervious Land Use Acres <br /> Impervious Land Use Acres <br /> PARKING FLAT 0.092 <br /> ANALYSIS RESULTS <br /> Flow Frequency Return Periods for Mitigated. POC #1 <br /> Return Period Flow(cfs) <br /> ' 2 year 0.020386 <br /> 5 year 0.027623 <br /> 10 year 0.032813 <br /> 25 year 0.039837 <br /> 50 year 0.045416 <br /> 100 year 0.051301 <br /> Water Quality BMP Flow and Volume for POC 1. <br /> On-line facility volume: 0.0073 acre-feet <br /> On-line facility target flow: 0.01 cfs. <br /> Adjusted for 15 min: 0 0116 `cfs• <br /> Off-line facility target flow: 0.0059 cfs. <br /> Adjusted for 15 min: 0.0066 cfs. <br /> As shown above the, undetained water quality flow rate is 0.0116 cfs. <br /> StormFilter Sizing: <br /> 0.0116 cfs = 5.2 gpm <br /> 5.2 gpm @ 7.5 gpm/cartridge: 5.2/7.5=0.69 -Therefore 1 cartridge is required. <br /> See StormFilter details on the next page. <br /> 1 6/16/2011 Stormwater Site Plan Page 31 <br />