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• as permanent ditches for 100-year, 24-hour precipitation events, and aze protected with placed <br />riprap. The steep, upper reaches of 4Nb and SP[b and Ditch 2Nb were modeled with riprap to <br />simulate the protection provided by clastic debris, cobbles and shingles. All ditches aze analyzed <br />with 0.3 foot of &eeboazd. Design ditch flows, slopes, minimum ditch dimensions, specifications, <br />and comments aze presented in the following table. <br />• <br /> <br />7-9 sinter iv~b <br />