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<br />GGJZ04 <br /> <br />ET" = ET.1_I <br /> <br />Vs 1 <br />+ ---'- <br />k <br /> <br />(6) <br /> <br />elevations (E..I) greater than the base elevation (En) of a particular volume-elevation polynomial. <br />the fraction of sediment deposited below En is given as <br /> <br />1. . <br />F = - L a;A , <br />100 i.() <br /> <br />(7) <br /> <br />where the llo = -0.12446880. a! = 0,22321191. a, = 0.19518545 '1O't, a3 = -0,24313067-10", <br />a. = -0.36516368'10.5. lis = 0.47607731'10'7. a. = -0,20394540'10.9. and A is the percent of <br />reservoir depth given by <br /> <br />E - E <br />A = 100 B T .1 <br />E,_, - ET" <br /> <br />(8) <br /> <br />The modification to the volume-elevation coefficient, C,. is then given as <br /> <br />CII = Cu_! - F,VsI + V sdead,t <br /> <br />(9) <br /> <br />where V""",.., is the volume of sediment that accumulates in the dead storage pool for time step <br />t and is given by <br /> <br />v sdead,t = F' VSI <br /> <br />(10) <br /> <br />when En is the base elevation corresponding to the top of dead storage, <br /> <br />For beginning elevations (E..I) less than En. the same equations apply except that F=l.O. <br /> <br />2, HYDROELECTRIC GENERATION AND CAPACTIY <br /> <br />The model will compute the energy generation and power capacity of each powerplant on a <br />monthly basis, At least two methods will be employed: one will assume that the powerplant <br />operates at maximum horsepower (peak power) at all times (currently used for the Upper Basin <br />reservoirs in CRSS) and the other will assume that the powerplant can operate at two levels _ <br />peak and off-peak (currently used for the Lower Basin reservoirs in CRSS). Both methods will <br />employ an iterative scheme to account for the effect of tailwater on the peak flow, <br /> <br />Flow as a function of static head (fore bay elevation - tailrace elevation) will be represented as <br /> <br />6 <br /> <br />DRAFr: February 17, 1994 <br />