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<br /> <br /> <br />W <br />;..l <br />l:)' <br />'" <br /> <br />Professional Paper 442. This report is based on data for the 1941- <br /> <br />1957 period. In summary, the report states that if the developccnts <br /> <br />of 1957 had not been in existence then: (1) the hypothetical average <br /> <br />yearly water yield at Lees Ferry would have been about 15.2 ~illion <br /> <br />acre-feet rather than the 12.7 million measured, (2) the hypothetical <br /> <br />average concentration Would have been about 250 cr./I rather than <br /> <br />observed values of about 500 mg/l, and (3) the hypothetical dissolved <br /> <br />solids discharge would have been about S.2 rather than observed amounts <br /> <br />of about 8.7 million tons annually. Substantially all the increase in <br /> <br />dissolved solids discharge was construed by the investigators to he <br /> <br />an effect of irrir,ation on 1.4 nillion acres of land. They estimated <br /> <br />the averaRe increase to he 2.4 tons per irrir.ated acre per year. From <br /> <br />one part of the area to another, this average was said to ranp,e from <br /> <br />about Del to 5.6 tons. The report did not indicate which portion of <br /> <br />this increase was due specifically to irrigation and whiCh to natural <br /> <br />sources. <br /> <br />Upper Colorado River Basin Cooperative <br /> <br />S.11ini ty Control Study (OSSR) <br /> <br />In cooperation with the Federal "'ater Pollution Control Administra_ <br /> <br />tion (now the Office of ~atcr Pro~rarns. Environ~ental Protection <br /> <br />Ap,ency). the Bureau of Rccl:'U!\ation in .July 1969 COMpleted a report <br /> <br />entitled "Upper Colorado River Rasin Cooperative Salinity Control <br /> <br />14 <br /> <br /> <br />