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<br /> <br /> <br />Cumulative Drainage The total drainage for all culverts contributing <br /> to an individual culvert's flow was combined (640 <br /> acres/sq.mi.) <br />Cumulative Runoff A weighted average of the individual culvert <br /> watersheds contributing to the flow at a given <br /> culvert <br />Peak Flow (csm/in) Figure 5-2, Reference No. 2 (TR-55.) based on <br /> cumulative T <br /> c <br />Peak Flow (cfs) csm/in x cumulative drainage x cumulative runoff <br />Peak Flow (gpm) cfs x 448.8 <br />Site Measured at mine <br />Required head/100' Assume "C" factor = 60 <br />Length Measured at mine <br />Required head Required head/100' x Length <br />100 <br />Avail head From culvert invert to one foot below top of <br /> ditch <br />Typical type ditch cross-section - load-out area <br />3\ ~J i <br />r---ro' ----I <br />M133 <br />_~ ~ <br />