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<br />
<br />20. Alley, W.M., Bauer, D.P., Veenhuis, J.E., and Brennan, R., 1979, Hydrologic effects of annually
<br />diverting 131,000 acre-feet of water from Dillon Reservoir, central Colorado: U.S. Geological
<br />Survey Water-Resources Investigations 79-2,17 p.
<br />
<br />Because of the increased demands for water in eastern Colorado, principally in
<br />the urbanizing Denver metropolitan area, increased diversions of water from
<br />Dillon Reservoir are planned. Estimates of end-of-month storage in Dillon Reservoir,
<br />assuming the reservoir was in place and 131,000 acre-feet of water were diverted from
<br />the reservoir each year, were reconstructed by mass balance for the 1931-77 water
<br />years. Based on the analysis, the annual maximum end-of-month drawdown below
<br />the elevation at full storage would have averaged 54 feet. The maximum end-of-
<br />month drawdown below the elevation at full storage would have been 171 feet. The
<br />mean-annual discharge-weighted dissolved-solids concentrations in the Colorado
<br />River near Glenwood Springs and Cameo, Colo., and Cisco, Utah, for the 1942-77
<br />water years, were computed assuming an annual diversion of 131,000 acre-feet of
<br />water from Dillon Reservoir. The average increases in the dissolved-solids
<br />concentrations with the 131,000-acre-foot diversion were 15 to 16 milligrams per liter
<br />a t the three si tes.
<br />
<br />21. Alley, W.M. and Ellis, S.R., 1978, Trace elements in runoff from rainfall anJsnowmelt at several
<br />localities in the Denver, Colorado, Metropolitan area, in Proceedings of the International
<br />Symposium on Urban Storm Water Management, July 24-27,1978: Lexington, Ky., University
<br />of Kentucky, p. 193-198.
<br />
<br />Concentrations of antimony, cadmium, chromium, lithium, manganese, mercury,
<br />nickel, and selenium have been determined in selected samples of rainfall runoff
<br />from several urban localities in the Denver metropolitan area. Multiple samples
<br />collected during periods of runoff from both rainfall and snowmelt were analyzed
<br />for arsenic, copper, iron, lead, and zinc. Of these trace elements, iron, lead, and zinc
<br />were predominant in runoff from the rainfall and snowmelt, with concentrations
<br />of iron at times exceeding 10,000 micrograms per liter and with concentrations of
<br />lead and zinc at times exceeding 1,000 micrograms per liter. The concentrations of
<br />trace elements were highest during the initial parts of the periods of rainfall runoff
<br />and then decreased with time. Trace-element concentrations in snowmelt runoff
<br />generally peaked during the middle of the day, corresponding with periods of
<br />maximum melting. and runoff. Instantaneous loads of trace elements were largely a
<br />function of discharge for runoff from both rainfall and snowmelt. The trace
<br />elements were predominantly in the particulate phase, with the ratio of particulate
<br />to dissolved concentrations averaging 20. Between April 1 and October 31,1976,
<br />estimated total loads of trace elements for a 606-acre residential site were: Arsenic,
<br />0.8 pound; copper, 4.4 pounds; lead, 44 pounds; and zinc, 23 pounds.
<br />
<br />22. Alley, W.M. and Veenhuis, J.E., 1979, Determination of basin characteristics for an urban
<br />distributed routing rainfall-runoff model, ill Storm water management model users group
<br />meeting: Montreal, Canada, U.s. Environmental Protection Agency.
<br />
<br />BIBLIOGRAPHY 11
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