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<br />tit <br /> <br />tit <br /> <br />e <br /> <br />_L <br /> <br />Solve for that combination of flow depth and velocity head which <br />results in the net head (hUSL) previously determined. Calculations <br /> <br />tabulated on following page based on the following criteria: <br /> <br />hUSL = d + hv = 7.59 ft, where d = depth of flow in ft, hv = velocity <br />head in ft = v2l2g, and v = q/d = unit velocity in fUs. <br />dUSL = 2.03.ft <br /> <br />hVUSL = 5.55.ft <br /> <br />ft <br />vUSL = 18.91.sec <br /> <br />Determine hydraulic condition at downstream lip of FES (Point 3): <br /> <br />Net head at downstream e:dge of lip (neglecting friction): <br />dOSL =dUSL dOSL=2.03-ft <br /> <br />hVOSL = hVUSL <br /> <br />hVOSL = 5.55-ft <br /> <br />Elevation of downstream edge of lip: <br />Lip_angle = 15.deg <br /> <br />. n <br />6 = Llp_angle'180.deg <br /> <br />6 = 0.26 <br /> <br />EOSL = EFES T (2.ft)'lan(6) <br /> <br />EOSL = 60.93 -ftel <br /> <br />Total head at downstream edge of lip: <br /> <br />HOSL = EOSL + dOSL' hVOSL <br /> <br />HOSL = 68.51-ft <br /> <br />Determine plunge pool requirements (ref: U.S. Bureau of Reclamation. 1987. Design of small dams. <br />p. 402-403): <br /> <br />Head to dissipate in plunge pool: <br />E]W = 63.47.ftel <br /> <br />(from tailwater rating curve; see <br />Appendix E) <br /> <br />h = 5.04-ft <br />pp <br /> <br />hpp = HOSL - E]W <br /> <br /> <br />Scour depth: <br /> <br />r ft(l- Oll5) 1 <br />d = 1.32. i' (h )Oll5.qO.54 <br /> <br />pp l (C~S 0.54 j pp <br /> <br />(Eq. 26, p. 402) <br /> <br />d =13.62-ft <br />pp <br /> <br />Epp = E]W - dpp <br /> <br />E = 49.85 -ftel <br />pp <br /> <br />Set plunge pool depth at 49.85 ft el (maximum scour depth). <br /> <br />IVqC <br />