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<br />~ <br />CP. <br />c.:, <br />~c'ilAPTER II <br /> <br />;~;~;.~~~ <br /> <br />GRAND VALLEY RIVER BUDGET <br /> <br />assumed constant, and equal to the flow weighted mean for the period of <br /> <br />record. <br /> <br />The ground water entering the system from ungaged areas was assumed to <br /> <br />flow only in the alluvial aquifers of the creeks, and that its flow wss <br /> <br />constant and of constant quality. It was further assumed that its flow was <br /> <br />proportional to the drainage ares of the creek. Wells above the Government <br /> <br />Highline Canal on Big Salt, East Salt, and West Salt Creeks were used to <br /> <br />determine the average flow and salt loading of ground water per acre of <br /> <br />drainage area. These averages were multiplied'by the drainage ares of West <br /> <br />Salt and added to the surface water flow and salt loading recorded at West <br /> <br />Salt. The result was then scaled up according to the total ungaged acreage <br /> <br />i'''s,), to estimate the total monthly inflows of water and salt from ungaged areas,' <br /> <br />As it turned out, wnen considering the salt and water budget for Grand <br /> <br />Valley, the effect of ungaged inflows.could be considered insignificant. <br /> <br />Precipitation <br />The precipitation input for the budget was determined by multiply~ng the <br /> <br />area of the system (123,100 acres) by the precipitation recorded at the <br /> <br />Weather Bureau's Walker Field Station. Precipitation was assumed to have no <br /> <br />associated salt. <br /> <br />Consumptive Use <br /> <br />Consumptive use in the Grand Valley has been determined by using two <br /> <br />extensive cropping pattern surveys and applying the Jensen-Haise method to <br /> <br />determine crop evapotranspiration. In addition, municipal consumption was <br /> <br />--.:.;., <br /> <br />1I-5 <br />