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TYPICAL DIVERSION DITCH CONFIGURATION <br /> <br />D <br />b <br />i <br />• <br />b = ditch bose width <br />p= design flow depth <br />f =freeboard <br />5H=IV= regrade slope <br />3H:IV= down slope berm <br />D/b= 0.25 (trapezoidal channels) _ <br />D = /Qn \ .375 <br />K s/z <br />where: p design flow (cfs) <br />n Manning's n <br />K = discharge factor <br />S ditch gradient (ft/ft) <br />D = design t.low depth (ft) <br /> <br />FIG. 3.6-6Q~ <br />3-153a <br />REVISION <br />APPROVED <br />DATE 9 a9- 87 <br />/hirJ Tci~n. <br />REVISED AUG 2 4 ~87 <br />