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• Where: a across sectional area of the pipe (ftz) <br />Ke = entrance head loss coefficient (0.6) <br />Kb bend head loss coefficient (0.50) <br />*Kc = head loss coefficient due to friction (0.0674) <br />L =length of pipe (including the riser)(ft) <br />g =gravitational constant (32.2 ft/sect) <br />H' = height of water above conduit outlet elevation <br />minus 0.6 times the conduit diameter (ft) <br />*Kc = 5087nz <br />di4/3 <br />Where: n = Manning's roughness coefficient for CMP (0.025) <br />di = outlet pipe diameter (18 inches) <br />• The SEDCAO+ computer program models the flow characteristics as the head <br />increases and calculates discharge utilizing the appropriate equation. <br />Tables 23-13 through 23-17, Outlet Works Design, contain the emergency <br />spillway discharge and design summary for each pond. Design parameters <br />for the spillways are also contained on the Proposed Pond and Ditch <br />Design Map, (Map 23-1). <br />r~ <br />L <br />23-150 <br />