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<br />. <br /> <br />. <br /> <br />. <br /> <br />00ll5:!J <br /> <br />." <br /> <br />2.2.a Input Data <br /> <br />The following salinity data are input into the modeling component of CRSS: <br /> <br />. monthly salt concentration at each hydrologic inflow point in mg/L <br />. ~onthlv salt pickup of return flow points of diversions (in ppm); this is in_ <br />addition to the concentratina effect of irriCJ..tion; the monthly pickup is constant <br />for all months in r.R55 and is associated with demand/consumptive data <br />variables; optionally, the pickup can be disaaaregated into monthl\[ values as <br />a function of the annual tons of pickup <br />the initi:'ll r:oncentr"tinn of TDS in each reservoir <br />. min~ and maximum salinitv concentration at check stations (? <br /> <br />A detailed description of these inputs into CRSS is given in Appendix A. <br /> <br />2.2.b Units <br /> <br />Generally, concentration is measured in parts per million (ppm) in the Colorado River <br />basin. CRSS assumes that a ppm is equivalent to 1 mg/L Using mg/l for <br />concentration, acre-feet for flow, and a conversion of 907.1 kg/ton. one obtains 735 <br />tons of salt per acre-ft-mg/L. With this conversion, the salt mass at given location is <br />given by: <br /> <br />salt concentration x water mass <br />tons of salt <br /> <br />(1) <br /> <br />735 <br /> <br />2.3 Computations <br /> <br />r CRSS is not entirel sist nt in it's methods. In addition, it performs calculations to <br />stlmate salt loading reduction due to water quality improvement projects (WQIP). It <br />is not always possible to categorize methods by PRSYM objects. The following <br />description attempts to describe the mass-balance salinity methods. <br /> <br />2.3.a Reservoirs <br /> <br />CRSS assumes that the reservoirs are of uniform salinity (completely mixed) at all <br />times. The concentration in a reservoir at the end of the month is based on the <br />volume and concentration of the inflow, the concentration of the reservoir at the <br />beginning of the month, the volume of the outflow, and the volume and concentration <br />of any water gained from bank storage. We will also model bank storage as a <br />completely mixed tank so that the concentration in bank storage when the flow is to <br />bank storage from the reservoir is given by: <br />