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DRAINAGE CRITERIA MANUAL (V. 3) STRUCTURAL BEST MANAGEMENT PRACTICES <br />0.50 <br />0.45 <br />NMI <br />N 0.35 <br />L <br />0.30 <br />a <br />a� <br />z <br />0.25 <br />m <br />0.20 <br />U <br />0.15 <br />0.10 <br />0.05 - <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 />Extended Detention Basin <br />40 -hour Drain Time <br />' <br />i <br />/ <br />Constructed Wetland Basin <br />24 -hour Drain Time <br />— WQCV <br />=a *10.91 i 1 <br />-9.19/ 1 +0.7811 <br />/ <br />i <br />Retention Pond, Porous Pavement <br />Detention and Porous <br />Landscape Detention <br />12 -hour Drain Time <br />_ <br />lee <br />zl;'� <br />T <br />I <br />T <br />0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 <br />Total Imperviousness Ratio (i = 1 , <br />Figure EDB -2 —Water Quality Capture Volume (WNQCV), 80 Percentile Runoff Event <br />2007 -01 (November rev.) S -73 <br />Urban Drainage and Flood Control District <br />