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<br />" <br /> <br />;';>1 <br />. ~ I <br />:,"'.'y' <br />,',', <br />,;:. <br /> <br />~il <br /> <br />~'~ <br />'yj' <br />,. <br />,,, <br />" <br />..)i:-~: <br /> <br />There is stratification of the lake. during the summer growing season and under <br /> <br />l\) <br />t.Q <br />C::l <br /><Xl <br /> <br />the ice in the winter. The lake operations at these time periods are <br /> <br />characterized by low release volumes from. the upper portion of the lake. ,As a <br /> <br />result, the anoxic bottom waters are turned over at a much slower rate <br /> <br />~ <br /> <br />compared to surface flows. The hypolimnion layer of the lake is a major <br /> <br />~J portion of the central pool. <br /> <br />1~1 <br /> <br />t~, <br />.".t <br />k,Y <br /> <br />~<-'l <br />~~, <br /> <br />The U.S. Army Corps of Engineers is currently assessing the reservoir <br /> <br /> <br />operations in relation to water quality. There is modeling effort in progress <br /> <br />, <br /> <br />which will evaluate the effect of hypolimnetic withdrawal. Other aspects of <br /> <br /> <br />lake operation under review are related to volume storage and release. There <br /> <br />is a potential for reservoir water quality improvement by changing the <br /> <br />~~ operation procedures. <br /> <br />.ft' <br /> <br />;~.., <br />~.-',~ <br />r,',,) <br />F' <br /> <br />&3' <br />, <br /> <br />t~t <br /> <br />{~-:~ <br /> <br />.",'.' <br />...i <br />J....-; <br />, ~i"l <br /> <br />!:~:: <br /> <br />Cherry Creek Reservoir, located in southeast Denver., is a eutrophic reservoir <br /> <br /> <br />positioned in a rapidly urbaniZing area. Phosphorus standards were <br /> <br />,'i. <br /> <br />established for the reservoir in 1984; the intent of the standards is to <br /> <br />protect the recreational resource which the reservoir provides the Denver <br /> <br /> <br />region. Phosphorus from both point and nonpoint. sources impact the <br /> <br /> <br />reservoir. Nonpoint source loading from both construction and urban runoff <br /> <br />are contributors to the inlake phosphorus problems. These sources must be <br /> <br />controlled in order for the phosphorus standards to be maintained. <br /> <br />The Denver Regional Countil of Governments, in association with the Cherry <br /> <br />Creek Basin Authority, has prepared a water quality management plan designed <br /> <br />1< 'to protect the quality of the reservoir. A wasteload allocation has been <br /> <br /> <br />-60- <br />