WSP10687 - Laserfiche WebLink

Home Browse Search

o m ~ o INTRODUCTION The January 1965 report appraised the water quality conditions in the Colorado River Basin above Imperial Da~ using the period 1941-61 as a base and included data from two points not considered in the 1963 re- port. The 1967 report included 3 additional years of record a'ld included suspended sediment data for six stations. Changes made in the January 1969 Progress Report included (1) con- sideration of the Ha~ond Project under present modified con~itions, (2) an average of a~out 9,000 acre-feet of water now being used by Cheyenne, Wyoming, (3) the addition of another key station, Colorado River near Glenwood Springs, (4) the net future effects of Upper Colo- rado River Storage Unit operations being limited to evaporation only, (5) elimination of the Marble Canyon Project, (6) addition of the Cen- tral Arizona Project by pumping, (7) addition of the Fort Mohave and Chemehuevi Indian lan~s, and (8) addition of the Colorado River India'l Project. Other additions included 2 more years of record through 1966, discussions of state water qaality standards, industrial wastes, munic- ip9.1 problems, temperature data, a!ld salinity control. Following, in addition to including 2 more years of record, are changes which have occut'red since completion of the January 1969 rep::Jrt and which are incorporated in this report: (1) showing present m::Jdi- fied flows and corresponding dissolved solids only on a mean annual ba- sis (1941-63) rather than on a year-by-year, month-by-month basis; (2) eliminating the Green River near Ouray, Utah, station; (3) consid- ering Silt and Emery County Projects as existing rather than future projects; (4) including estimated average reservoir evaporation losses not reflected in historic records as a part of present modified flows; (5) showing only "Historical, Present Modified, and F<lture" con~itio~,s on the Summary Table No. 18; and (6) addition of discussions of agri- cultural wastes, mine drain9.ge, dissolved oxygen, pH, toxic materials including pesticides, heavy metals, nutrients, an~ radioactivity. In order to keep each report self-contained, it has been neces- sary to include some of the text material and tables from these previ- ous rep::Jrts in this fifth progress report dated January 1971. C. Cooperation , This report was prepared by the Bureau of Reclamation with assist- ance of the Geological Survey and Federal Water Quality Administration. The Geological Survey provided most of the basic data and prepared some of the sections of "Basic Studies." A continuing cooperative program between the Bureau of Reclamation and the Survey for the collection of streamflow quality data and the exchange of information has been in ef- fect for a number of years. This cooperation provides for the collec- tion of data at stations other than those normally maintained by the Survey. The Federal Water Quality Administration who collects samples 4