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<br />r <br />II: <br /> <br />I <br /> <br />t <br />I <br />I <br />I <br />I <br />I <br />I <br />\1 <br />it <br />,\ I <br />I <br />I <br /> <br />CITY OF GREENWOOD VILLAGE <br />STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA CODE <br /> <br />TABLE 8 <br /> <br />STORM SEWER ENERGY LOSS COEFFICIENTS <br />(ENTRANCE LOSS) <br /> <br />Type of Entrance <br /> <br />Entrance Coefficient, Ke <br /> <br />Pipe <br /> <br />Headwall <br />Grooved edge <br />Rounded edge (0.150 radius) <br />Rounded edge (0.25D radius <br />Square edge (cut concrete and CMP) <br /> <br />o <br />Headwall & 45 Wingwall <br />Grooved edge <br />Squ are edge <br /> <br />Headwall with Parallel Wingwalls Spaced 1.250 apart <br />Grooved edge <br />Square edge <br />Beveled edge <br /> <br />Projecting Entrance <br />Grooved edge (RCP) <br />Square edge (RCP) <br />Sharp edge, thin wall (CMP) <br /> <br />Sloping Entrance <br />Mitered to conform to slope <br />Flared-end Section <br /> <br />Box, Reinforced Concrete <br /> <br />Headwall Parallel to Embankment (no wingwalls) <br />Square edge on 3 edges <br />Rounded on 3 edges to radius of 1/12 barrel dimension <br /> <br />Wingwalls at 300 to 750 to barrel <br />Square edged at crown <br />Crown edge rounded to radius of 1/12 barrel dimension <br /> <br />Wingwalls at 100 to 300 to barrel <br />Square edged at crown <br /> <br /> <br />Wingwalls parallel (extension of sides) <br />Square edged at crown <br /> <br />0.20 <br />0.15 <br />O. lO <br />0.40 <br /> <br />0.20 <br />0.35 <br /> <br />0.30 <br />0.40 <br />0.25 <br /> <br />0.25 <br />0.50 <br />0.90 <br /> <br />0.70 <br />0.50 <br /> <br />0.50 <br />0.20 <br /> <br />0.40 <br />0.20 <br /> <br />0.50 <br /> <br />0.70 <br /> <br />NOTE: The entrance loss coefficients are used to evaluate the culvert or sewer <br />capacity operating under outlet control. <br /> <br />WRC, INC. <br />Sept. 1982 <br /> <br />REFERENCE: "Urban Storm Drainage Criteria Manual" <br />DRCOG, 1968 <br />