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<br /> <br />. ,.... t' <br />i\Jv- <br /> <br />effect deferring its consideration of <br />the Special Master's preliminary <br />rulings until the entire trial before the <br />Special Master is completed. <br /> <br />Lo~.er Colorado Ri~'er Return flow <br />Study <br /> <br />The activities of the Federal.State <br />Task Force on Ground Water Return <br />Flows 10 the lower Colorado River <br />have been dpscribed in the Board's <br />previous annual reports. The Task <br />Force met twice during 1979 to <br />discuss progress on the study. <br />High ,11>01't' rh(' Gr.lmi C.Jn}.OIl, it is <br />dii(;Cll/r 10 re,ll;/(' r/l,lIlhe Co/orJdo, in <br />1.lrt. I. {lilt' of rhl' lJ.1rion'~ moslll1Jnaged <br />of r;\I('" <br /> <br />...- <br /> <br />..."'!]- <br /> <br />By the U'>f' of piezometer network<> <br />and digital computer models in the <br />Yuma area, the U.s. Geological <br />Survey has estimated that there are <br />about 79,000 acre-feet per year of <br />underflow returning to the <br />mainstream, with about 46,000 <br />acre-feet coming from the Arizona <br />side and 33,000 acre. feet coming from <br />the California side. However, since <br />the state line does not follow the <br />Colorado River in much of this area, it <br />will be a complex problem to <br />determine return flows for individual <br />diverters within the states, In addition, <br />flood flows and the present high <br />releases 10 Mexico ha...e caused <br /> <br />t,1I <br /> <br />r <br /> <br />...."~..- <br /> <br />'^ <br /> <br />additions to ground water storage that <br />will require '>f'veral years 10 stabilize <br />after the excess flows are stopped. <br />The Geological Surve't' is developing <br />additional analytical methods to <br />handle this problem. <br />For the Parker, Palo Verde, and <br />Gbala Valleys, the Geological Survey <br />plans to develop a simplified <br />analytical melhod utilizing a <br />mathematical model of the entire area <br />in order to save time, compcHed to <br />the individual cross sections that were <br />developed in the Yuma area. <br />The issue of the State of California <br />being charged for additional <br />diversions from the Colorado River as <br /> <br />; ,:: ' , ~ <br />