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<br />C:J <br />(:J <br />t\:) <br />l-' <br />00 <br />I-" <br /> <br />149 <br /> <br />5.2.2 ADJTC: Salinity Adjustments <br /> <br />This subroutine adjusts monthly natural dissolved solids dis- <br /> <br />charge, and therefore concentrations, for the effects of Upper Basin <br /> <br />water depletions. <br /> <br />As explained in the description of the stream salinity model <br /> <br />(Chapter 3), the average natural discharge of salt, TN, is taken <br /> <br />equal to the average historical value, TH. Because man's effect upon <br /> <br />the total dissolved solids discharges during the period of model <br /> <br />calibration is nearly constant, the historical discharges from 1940 <br /> <br />to 1968 are taken to be a base load condition. To express salinity <br /> <br />conditions for depletion levels higher than those of the 1940 to <br /> <br />1968 period, only the effects of additional depletions are considered. <br /> <br />The effects of additional depletions upon stream salinity <br /> <br />are taken as a function of the type of consumptive use. The adjustments <br /> <br />are expressed in Equation (5.2). <br /> <br />(5.2) <br /> <br />TY = TNY - tDTDMI - DTEXP - tDTAGI <br />tm t m m t m m <br /> <br />where: <br /> <br />TY <br />t m <br /> <br />= the adjusted TDS discharge for tributary t, <br />year y, and month m; <br /> <br />TNY = the (synthetic) natural TDS discharge; <br />t m <br /> <br />tDTDMIm <br /> <br />the net removal of or addition to TDS solids <br />from additional municipal and industrial <br />diversions over the (1940-1968) base; <br /> <br />= <br /> <br />tDTEXPm <br /> <br />the additional exportation of TDS over the <br />base level; and <br /> <br />tDTAGIm <br /> <br />= <br /> <br />the net effect upon the TDS discharge by <br />additional agricultural diversions. <br />