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<br />tit <br /> <br />e <br /> <br />e <br /> <br />Taft Avenue Culvert - Outlet & Energy Dissipation Design <br />City of Loveland I 067..Q16 130 January 1996 (dkt) <br /> <br />Given: <br /> <br />QIOO = 269.cf, <br /> <br />Dpipe c4.ft <br /> <br />ft <br />g = 32.2.-- <br />sec2 <br /> <br />EFES = 60.39.ftel <br /> <br />Definitions: <br /> <br />Q = discharge (cfs), D = pipe diameter (It). E = elevation (It MSL). <br />, <br />A = cross-sectional area (lt2), v = velocity (ftIsecj, hv = velocity head (It). <br />H = head elevation (It MSL), h = net head (It), d = depth (It). <br />SL = station length (It), S = slope (H:V) <br /> <br />FES = flared end section, USL = upstream edge of lip, DSL = downstream edge <br />of lip. pp = plunge pool <br /> <br />Determine upstream hydraulic condition at pipe/FES transition (Point 1): <br /> <br />Velocity head in pipe: <br /> <br />(D. \2 <br />A =".( P'P<I A. =12.570ft2 <br />pipe \ 2 I pipe <br />, , <br /> <br />V. <br />P'P< <br /> <br />QIOO <br />A. <br />pIP< <br /> <br />ft <br />vp'~ =21.410- <br />It'~ see <br /> <br />hv. <br />P'P< <br /> <br />'v )2 <br />_ \ pipe <br />- 2.g <br /> <br />hv. =712.ft <br />pIpe . <br /> <br />Total head at pipe exit: <br /> <br />E. <br />pIpe <br /> <br />( ft\ <br />= EFES + (8.ft). \0.0055.ft) <br /> <br />Epip, = 60.43 oftel <br /> <br />Hpipe = Epipe r Dpipe 7- hv pipe <br /> <br />Hpipe = 71.55 oftel <br /> <br />Determine hydraulic condition at upstream lip of FES (Point 2): <br /> <br />Expansion loss for FES: <br />ke = 0.5 <br /> <br />(expansion coefficient, gradual <br />expansion: ref. Chow, p. 311) <br /> <br />hFES = 3.56 oft <br /> <br />hFES = k,hvpipe <br /> <br />Total head at upstream side of deflector lip (neglecting friction): <br /> <br />HUSL = Hpjp< - hFES <br /> <br />HUSL = 67.99 oftel <br /> <br />Net head at upstream side of deflector lip (neglecting contraction loss): <br /> <br />( ft\ <br />EUSL =EFES+(2.ft).{0055.ft) <br />hUSL = HUSL - EUSL <br /> <br />EUSL = 60.4 oftel <br />hUSL = 7.59 oft <br /> <br />Unit discharge across FES lip: <br />W =7.ft <br /> <br />(width of flared end section: use 7 It <br />for HydroConduit FES or 8 It for <br />Carder Concrete FES -> 7 It width <br />more conservative) <br /> <br />_ QIOO <br />q W <br /> <br />cfs <br />q = 38.43 oft <br /> <br />/(("0 <br />