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DRAINAGE CRITERIA MANUAL (V. 1) <br />60 <br />n ~ <br />O <br />2C <br />00 <br />MAJOR DRAINAGE <br /> <br /> <br /> <br />P $ <br />FD 69'' <br />~`~ ~~ <br /> <br />~ <br />~~ <br /> J s~ps~~ ~ ~ye N <br /> MI <br />S'~ PE , <br /> TYPE t. <br /> i <br /> <br />.2 .4 Y /D .6 .B 1.0 <br />t <br />Use Do instead of D .whenever flow is supercritical in the barrel. <br />~+r Use Type L fora distance of 3D downstream . <br />FIGURE MD-21 <br />Riprap Erosion Protection at Circular Conduit Outlet Valid for Q/D~ 5 <_ 6.0 <br />06/2001 MD-109 <br />Urban Drainage and Flood Control District <br />