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��COLORADO LEGACY LAND <br /> ATTACHMENT 1. URBAN DRAINAGE AND FLOOD CONTROL DISTRICT DRAINAGE <br /> CRITERIA MANUAL FIGURE MD-21 <br /> DRAINAGE CRITERIA MANUAL(V.1) MAJOR DRAINAGE <br /> 60 <br /> � M <br /> 20 <br /> I <br /> 00 .2 0.21 A Y /D .6 .8 1.0 <br /> 1 t <br /> 3;5 =0.2`j <br /> Use Do instead of D whenever flow is supercritical in the barrel. <br /> *#Use Type L for a distance of 31) downstream. <br /> 67.7 <br /> Figure MD-21—Riprap Erosion Protection at Circular Conduit Outlet Valid for QID"'S 6.0(:-?-?,g`Z•�S <br /> 3,5 <br /> Q=�S�SJ T�v�J (G3/5) ON <br /> Cobra'✓6t1� <br /> Rev.0412008 MD-107 <br /> Urban Drainage and Flood Control District <br /> PAGE 7 OF 10 <br />