Laserfiche WebLink
TABLE 2 <br />TIME OF CONCENTRATION DETERMINATION <br />Non-uniform gradient <br />A. First increment, cliff area <br />L = 0.76 mi <br />~. <br />H = 7966-7326 = 640 ft. <br />Tc = [11.9 L3/H]0 385 <br />Tc = [11.9 (0.76)3/640]0.385 <br />Tc = .157 hour <br />B. Second increment, severe slopes <br />L = 0.67 miles <br />H = 230 ft. <br />Tc = [11.9- (.67)3/320]0.385 <br />Tc = 0.201 hours <br />C. Third increment, foothills <br />L = 3.6 miles <br />H = 8220-7326 = 894 <br />Tc = [11.9 (3.6)3/894]'385 <br />Tc = .832 hours <br />D. Total concentration time = 1.19 hours <br />71.4 min. <br />• <br />• <br /> <br />VI-18 <br />