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<br />RESULTS OF COLORADO RIVER SIMULATION MODEL <br /> <br />Water Shortages <br /> <br />Shortage messages generated by CRSS provided information on specific demclnds. <br />Consumptive need, water availability, and volume-short water values were <br />listed by month for demands not satisfied. These messages reflected shortages <br />in the Upper Basin. <br /> <br />Shortages not satisfied without weather modification totaled 7248 x 106 ~ubic <br />meters (5 876 000 acre-feet). These shortages were reduced to 6035 x lOb cubic <br />meters (4 893 000 acre-feet) by precipitation augmentation programs. <br /> <br />In the model, shortages of consumptive use water were reduced over 15 percent <br />by precipitation enhancement programs in the Upper Colorado River System from <br />1991-2020. Average yearly shortage reduction amounted to almost 41 x 106 cubic <br />meters (33,000 acre-feet). <br /> <br />Releases below Hoover Dam provided for a minimum flow of 6692 x 106 cubic <br />meters (5 425 000 acre-feet) with no NWM (no weather modification) and 67'64 x <br />106 cubic meters (5,484,000 acre-feet) with TBWMOD at Imperial after 1991 <br />when the CAP js scheduled to be on-line. This allowed for the delivery of <br />the 1850 x lOb cubic meters (1 500 000 acre-feet) required flow to Mexico <br />as a number one priority. <br /> <br />Salinity Reduction <br /> <br />Reduction in the concentrations of TDS (total dissolved solidS) resulting <br />from weather modification is illustrated in table 4. <br /> <br />Modeled concentration reduction during the 1991-2020 period at lees Ferry was <br />64 mg/l. Below Hoover Dam the concentration reduction was 67 mg/l. At <br />Imperial, the largest concentration reduction was indicated with a 91 mg/l <br />reduction exhibited. <br /> <br />.. <br /> <br />Yearly average TDS concentrations with TBWMOD varied at lees Ferry from <br />623 mg/l to 816 mg/l. These concentrations increased and ranged from <br />798 mg/l to 954 mg/l below Hoover Dam. Following is an example of the <br />maximum yearly TDS concentration in mg/l at Lees Ferry and Imperial: <br /> <br />Lees Ferry <br /> <br />Imperial <br /> <br />NWM <br />TBWMOD <br /> <br />881 <br />816 <br /> <br />1294 <br />1186 <br /> <br />As flow increased at lees Ferry, concentrations of TDS decreased, but total <br />tons of TDS del ivered increased. As flow increased at Hoover Dam and Imperi al, <br />TDS decreased and total tons of TDS delivered decreased. <br /> <br />Total dissolved solids values provided to the model were based on 1952-1971 <br />historic virgin salts. <br /> <br />10 <br />