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GOJ~91 i . . * 10. Salinity . 10.1 General Salinity is the only water quality parameter modeled by the CRSS. Salinity is modeled as total dissolved solids; precipitation and ion exchange are not modeled. Salinity is computed by the CRSM at each point in the system as concentration in the river, in units of mg/L. (The CRSS assumes mg/L and parts per million are equivalent.) The concentration in the river can increase, decrease, or re- main constant at each point depending on whether salt is being added or removed, whether water is being added or removed, and on the concentration of the inflow or diver- sion. 78 * . . ,. . I . I t I . ) . . . The salt loads from natural point or natural diffuse sources of salinity are included in the natural salt val- ues in the hydrology input data. These salt loads, there- fore, enter the system at CRSS inflow points. 10.2 Concentration in the River . The concentration in the river at an inflow point in- creases if the concentration of the inflow is greater than the concentration in the river. The concentration in the river decreases if the concentration of the inflow is less than the concentration in the river. The concentra- tion of the inflow is computed from the natural salt load in the hydrology input data file. The concentration in the river at a diversion point nor- mally does not change. With ~~e exception of special ex- ports, diversions are made at the same concentration as the concentration in the river, which, therefore, does not change the concentration in the river. A special export diverts water at the concentration specified in the de- mand data input file. This allows special exports to di- vert water at a concentration that is different than the concentration in the river, if the export is actually di- verted farther upstream than the CRSM models. The concen- tration in the river increases if the concentration of the special export is less than the concentration in the river. The concentration in the river at a return flow point in- creases if the concentration of the return flow is greater than the concentration in the river. The concentration in the river decreases if the concentration of th~ return flow is less than the concentration in the river. The concentration of the return flow is firstly dependent on the amount of diversion that is depleted. All salt that is diverted from the river is returned in the return flow, .