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<br />I <br />I <br />1 <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />:, <br /> <br />I <br /> <br />CITY OF GREENWOOD VILLAGE <br />STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA CODE <br /> <br />TABLE 7 <br /> <br />STORM SEWER ENERGY LOSS COEFFICIENT <br />(EXPANSION ,CONTRACTION, BENDS) <br /> <br />(a) <br /> <br />Expans ion (I' ) <br />e <br /> <br /> <br />(b) Pipe Entr3nce from Reservoir <br /> <br />an O2 3 O2 1.5 <br />-~ -; <br /> 0" 01 <br /> I <br />10 0.17 0.17 <br />20 0.40 0.40 <br />45 0.86 1.06 <br />60 1.02 1.21 <br />90 1.06 I. J4 <br />120 1.04 1.07 <br />180 1.00 1.00 <br />* The angle e is the angle in <br />degrees between the sides of the <br />tapering section. <br /> <br />~t <br /> <br />~~DI <br /> <br />V2 <br />Bell-mouth ilL ~ 0.04 <br />Ii <br /> <br />Square-edge <br /> <br />V2 <br />II - 0.5 2g <br />L <br /> <br />Groove end U/S <br />For Concrete <br />Pipe <br /> <br />ilL ~ 0.2 V2 <br />2g <br /> <br /> I r-D2 <br />(c) Contractions (K ) <br /> c <br /> O2 K ~t <br /> OJ c <br /> 0 0:5 <br /> 0.1. 0.4 <br /> 0.6 0.3 <br /> 0.8 0.1 ~ <br /> J .0 0 <br /> (d) Bends (Kb) <br /> Deflection angle of bend <br />Radius of bend <br />Pipe diameter 900 450 22.50 Deflection <br /> angle <br />I 0.50 0.37 0.25 <br />2 0.30 0.22 0.15 <br />4 0.25 0.19 0.12 <br />6 0.15 0.11 0.08 <br />8 0.15 0.11 0.08 <br /> <br />WRC, INC. <br />Sept. 1982 <br /> <br /> <br />REFERENCE: Linsley and Franzi"i "Water Resources Engineering" <br />McGraw-Hill, 1964 <br />