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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />STRUCTURES <br />DRAINAGE CRITERIA MANUAL <br />~A <br />(a) PLAN <br />NATURAL pROJECTED FUTURE DOWNSTREAM <br />3~MAX. CHANNEL GRADE BELOW SILL <br />SLOPE <br />1: ------ <br />CONTROL SILLS ARE PROJECTED ' <br />SPACED TO PRODUCE SLOPE <br />MAXIMUM 3 FT. DROP <br />(b) PROFILE <br />NATURAL BANK SLOPE MINIMUM DEPTH TO CARRY 2-YEAR <br />FLOOD FOR FUTURE DEVELOPED <br />BASIN <br />MATCH TO EXISTING <br />• GRADE SURFACE MINIMUM WEIR CAPACITY = , <br />• ' 3% OF Olpp w/o USE OF ~ <br />' DETENTION ' <br />. \, _ ~ / <br />• .• .PROJECTED GRADE ~ ~ 3' MAX. <br />• FUTURE DOWNSTREAM ~__ ~ <br />•p __ ~ 2' <br />(c) SECTION A•A' <br /> <br />CONTROL SILL FOR STABLE FLOODPLAIN <br />November 15, 1990 FIGURE 2-19 2-52 <br />