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6 <br />TYPICAL DIVERSION DITCH CONFIGURATION <br />c <br />b = ditch base width <br />D= 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 />FIG. 3.6-6A <br />3-153a <br />D = /On \ .375 <br />K S/z <br />where: 0 = design flow (cfs) <br />n = Manning's n <br />K = discharge factor <br />S = ditch gradient (ft/ft) <br />D= design flow depth (ft) <br />REVISION <br />APPROVED <br />DATE 9'-E27 — 87 <br />REVISED AUG 201 <br />1 <br />