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Culvert No. C.M.P. Diameter Station Localized Drainage Area <br /> (From IECO Plan and <br />• (Inches) Profile) (Acres) (See Map) <br />1 18 7+00 1 <br />2 <br />~ 12 12+00 9 <br />3 - 20+25 - (Reservoir outlet) <br />4 18 24+50 5 <br />5 18 28+10 2 <br />6 18 44+gp 9 <br />Determine peak flow for each culvert location: <br />CULVERT 1 STA. 7+00 <br />(1) Qp = aAQ, determine time of concentration, Tc <br />All overload flow. <br />1 = hydraulic length = 600' <br />s = average watershed slope = 8~ <br />v = estimated velocity = 2 ft/sec (Ref. 3, P 3-2, Fig. 3-1). <br />• Tt 1 = .600 = .08 hr. = approx. 1 hr. <br />v 2 sec <br />(2) q, from Fig. 5-2, P 5-5, (Ref. 3): <br />q = 1000 CSM/inch (Graph, Fig. 5-2, Ref. 3) . <br />A = .0015 Mil <br />(3) Qp = aAQ <br />_ (1000)(.0015)(.46) <br />=.7cfs <br />(4) Check hydraulic capacity of culvert <br />From Ref. 4, P. 161: <br />HW = 1.0 Type 3 Entrance Inlet control governs. <br />D <br />Use 12" Q C.M.P.* <br />(5) Existing C.M.P. is 18" Q.' 0. K. <br />* Note: Culvert locations 1 and 2 (Sta. 7+00, 12+00) we re. not considered to be <br />. influenced by watershed drainage areas north of Colorado State Highway 13/769. <br />No existing drainage structures are located in near proximity to the FF Road <br />entrance of crossing Highway 13/769 Right-of-Way. The highway is assumed to <br />provide a barrier to runoff potential north of the highway. <br />-4- <br />