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002J51 . 2.3 River Reach and Reservoir Element Inputs River reach and reservoir element inputs refer to those inputs representing water and/or salt additions and depletions to the river system. They permit an accounting of activities within the system and are only allowed for river reach and reservoir elements. All inputs are time dependent and may be specified using either monthly values or annual ones which are distributed using a monthly percentage distribution. Four type of inputs are allowed: Import/exports (Cards 15-1 through 15-7). - Both the quantity of water (1,000 acre-feet/month) and salt are specified. Salinity may be expressed as a concentration (tons/acre-foot or ppm) or as a mass (1,000 tons/month). A positive mass sfgnifies the addition of water or salt to the river system while a negative denotes a depletion or removal. When the salinity is a concentration, the product of the signs of the flow and concentration determines the sign of the salt mass. (Negative concentrations are permitted.) . This type of input may be used to account for a variety of activities in the basin. For example: Sign on mass of: Item Flow Salt Import Irrigation Export Consumption Desalting + + + It is noted that the combination of a positive flow and nega- tive salt mass is not apt to occur. One possible though unlikely situation would be a desalting plant disposing of brine in an isolated deep aquifer, using water from a shallow aquifer for blending purposes. . Exports (Cards 13-1 through 13-3). - Only the quantity of flow (1,000 acre-feet/month) removed or exported from the river basin is specified. For river reaches the concentration of the exported water is that of the upstream inflow to the element containing the export prevailing at the given time. For reservoirs, export concentrations equal the reservoir concentration at the start of the month. Consequently, 2-17