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DRAINAGE CRITERIA MANUAL (V. 3) STRUCTURAL BEST MANAGEMENT PRACTICES <br />0.50 <br />0.45 <br />0.40 <br />N 0.35 <br />0.30 <br />v <br />a <br />z <br />0.25 <br />0.20 <br />U <br />Ci <br />0.15 <br />0.10 <br />0.05 <br />0.00 <br />0 <br />0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 <br />Total Imperviousness Ratio (i = I, <br />Figure EDB -2 —Water Quality Capture Volume (WQC16, 80 Percentile Runoff Event <br />6 -hr drain time a = 0.7 <br />12 -hr drain time a = 0.8 <br />24 -hr drain time a = 0.9 <br />40 -hr drain time a = 1.0 <br />lExtended Detention Basin <br />40 -hour Drain Time <br />% <br />1 1 <br />i / <br />j <br />Constructed Wetland Basin <br />24 -hour Drain Time <br />WQCV= <br />a'(0.91 i' <br />-1.19i z +0.78/1 <br />�I <br />Retention Pond, Porous Pavement <br />Detention and Porous <br />Landscape Detention <br />12 -hour Drain Time <br />2007 - 01 (November rev.) S - 73 <br />Urban Drainage and Flood Control District <br />