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• CULVERT 6 STA 44+90 <br />(1) A = 9 Ac = .014 Mi.2 <br />(2) Determine Tc. All overland flow. <br />1 = hydraulic length = 1400' <br />s = 36% <br />v = estimated velocity = 4.5 ft./sec. <br />Tt = Tc = 1 = 1400' = 311 sec. _ .08 hrs. Use .1 hrs. <br />v 4.5 ft./sec. <br />(3) q = 1000 CSM/in2 (Graph Fig. 5-2, Ref. 3) <br />(4) Qp = (1000)(.014)(.46) <br />• = 6.4 cfs. <br />(5) Check hydraulic capacity <br />HW = 1.0 Try Type 3 entrance. <br />D <br />Use 21" p culvert. •Not 0. K. <br />(6) Try existing 18" C.M.P. with steel end section at inlet <br />(Type 1 Entrance) <br />18" 0 culvert 0. K. <br />• <br />-~- <br />