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SEDCAD+ CULVERT SIZING UTILITY <br />culvert 9 <br />• Design Discharge = 0.320 cfs <br />Entrance Loss Coefficient = 0.5 <br />Pipe Length = 120.000 feet <br />Pipe Slope = 0.500 $ <br />Manning's n = 0.024 <br />Maximum Headwater = 2.400 feet <br />Tailwater Depth = 0.000 feet <br />Smallest Diameter Required to Pass Flow is 6 inches <br />PERFORMANCE CURVES: <br />Diameter: 4 inches <br />Headwater Discharge Flow <br />(ft) <br />------------- (cfs) Control <br />------------------------------ Type <br />--------------- <br />0.24 0.00 0 <br />0.48 0.00 0 <br />0.72 0.01 0 <br />0.96 0.01 0 <br />1.20 0.01 0 <br />1.44 0.01 0 <br />1.68 0.01 0 <br />1.92 0.02 0 <br />• 2.16 0.02 0 <br />2.40 <br />------------- <br />------------- 0.02 <br />------------------------------ <br />------------------------------ 0 <br />--------------- <br />--------------- <br />Diameter: 6 inches <br />Headwater Discharge Flow <br />(ft) <br />------------- (cfs) <br />------------- Control <br />----------------------- Type <br />--------- <br />0.24 0.02 -- 0 <br />0.48 0.04 0 <br />0.72 0.05 0 <br />0.96 0.07 0 <br />1.20 0.09 Outlet (Subcritical) 1 <br />1.44 0.11 Outlet (Subcritical) 1 <br />1.68 0.13 Outlet (Subcritical) 1 <br />1.92 0.14 Outlet (Subcritical) 1 <br />2.16 0.16 Outlet (Subcritical) 1 <br />2.40 <br />------------- <br />------------- 0.18 <br />------------- <br />------------- Outlet (Subcritical) <br />----------------------- <br />----------------------- 1 <br />--------- <br />--------- <br /> Diameter: 8 inches <br />Headwater Discharge Flow <br />(ft) (cfs) Control Type <br />------------- <br />• 0.24 ------------- <br />0.08 ----------------------- --------- <br />0 <br />0.48 0.16 Outlet (Subcritical) 1 <br />0.72 0.24 Outlet (Subcritical) 1 <br />0.96 0.32 Outlet (Subcritical) 2 <br />Exhibit 18 273a Revised 4/9/90 <br />