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<br />00133~ <br /> <br />Projects located in the Parker-Imperial reach, Element 16 of <br />Figure 2, including various Indian lands and the Lower Colorado <br />River Channelization Project (water salvage). <br /> <br />In most cases, a single annual pattern of monthly values was used <br />repeatedly for each year's input. However, the San Juan River is <br />a very erratic, flashy stream, with many months of low flows. In <br />developing run inputs, difficulties arise when an average operating <br />plan is employed since the entire stream may be depleted. As a con- <br />sequence, the full development values were based on a detailed oper- <br />ations study. Values are given in Table XI. <br /> <br />Because the quantity of water for a given project is specified on <br />input, the demand for water in a reach may exceed the available <br />supply. In practice, this did occur during many runs for the <br />upstream boundaries. l'/hen this happens, outflow from the reach <br />is set to zero and the corresponding computed salt mass is also <br />set to zero. The shortage in water is referred to as deficit flows <br />and the salt mass to delta salts.[2, Section 5.8] A positive delta <br />salt indicates the computed salts would have been carried downstream <br />if flows existed. Negative delta salts are also computed if the mass <br />of salt removed as specified on input, exceeds the salt mass in the <br />stream. Deficit flows and delta salts are given in Table XIII for <br />each run. <br /> <br />The changes in reservoir storage, including the banks, are tabulated <br />in Table XIV for each run. Mean monthly run results at the various <br />nodes and elements are given in Table XII. <br /> <br />Future Development Runs <br /> <br />Additional information for the various future development runs <br />follows. <br /> <br />fla) - 1980 - Only those projects whose effect would be felt at <br />mperial Dam by 1980 are included. An approximate transit time <br />through the reservoirs of 4 years was assumed. A single annual <br />cycle was used for the San Juan River projects, resulting in <br />some shortages. Runs were made at 0 and 2-ton/acre pickup rates. <br /> <br />(la) - 1990 - A single annual cycle was again used for the San <br />Juan River projects. CAP was included as operational, ~'/D was <br />reduced to 550,000 acre-feet/year, and Imperial target flows were <br />set to 5.7 million acre-feet/year. Runs were made at pickup rates <br />of 0 and 2 tons/acre. <br /> <br />(la) - 2000 - Under the assumption of no additional Federal develop- <br />ment, all projects are assumed to be completed before 1990.Conse- <br />quently, there is no year 2000 run. <br /> <br />29 <br />