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<br />OGu205 <br /> <br />Q = C . C H . C HZ . C H' <br />I 2 3 4 <br /> <br />(11) <br /> <br />where the C;'s are user-supplied coefficients and H is the static head. Similarly, the power as <br />a function of static head will be represented by <br /> <br />HP = Cs + C.H + C,Hz . C.H' <br /> <br />(12) <br /> <br />where the C,'s are user-supplied. The tailwater elevation will be computed in one of two ways, <br />If there are no backwater effects from a downstream reservoir, <br /> <br />ETW = C, + CzQ + C,Qz + C,Q' <br /> <br />(13) <br /> <br />or for the case of backwater effects, <br /> <br />ETW = C, + max[Ed.1 ' Ed....] + Cz + C,Q <br /> <br />(14) <br /> <br />where Eds.l is the current elevation of the downstream reservoir and Ed" is the reference elevation <br />for the downstream reservoir for which the coefficients are specified, <br /> <br />3. RIVER REACH <br /> <br />The concept of a reach will be different than that used in the existing CRSS, In this model, a <br />reach will only pertain to an actual stretch of river, connecting other objects such as reservoirs, <br />diversions, and confluences, A river reach will be capable of routing flow using lag coefficients, <br />given by <br /> <br />. <br />QO",I = L CP""_j <br />j=O <br /> <br />(15) <br /> <br />where QOUl is the outflow from the reach and Qin is the inflow to the reach, For the Colorado <br />River on a monthly time step, n=O and Co will usually be unity. <br /> <br />4. DIVERSION <br /> <br />Diversion objects will be capable of diverting water (from river reaches or reservoirs) and <br />returning some portion of that water at later times and at a spatial position possibly different from <br />the point of diversion. The quality of the return flow (with respect to salinity) will also be able <br />to be specified. <br /> <br />5. CONFLUENCE <br /> <br />The confluence objects will be capable of merging inflows from more than one source into a <br />single outflow and will compute the quality of the resulting flow with respect to salinity, The <br /> <br />7 <br /> <br />DRAFr: February 17, 1994 <br />