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<br />F. Water Supply <br />Operational Factors <br />(Cont'd) <br /> <br />3. <br /> <br />Frazil Ice <br />Problems <br /> <br />4. <br /> <br />Operational <br />Reliability <br />of New <br />Diversion <br /> <br />Strontia Springs <br /> <br />Operation would be <br />relatively free of <br />frazil ice problems <br />due to ice cover in <br />winter, length and <br />volume of reservoir <br />and deep multi- <br />level diversion <br />intakes. Present <br />operational problem <br />at Aurora intake <br />eliminated. <br />Problems down~ <br />stream at Platte <br />Canyon intake <br />probably eliminated. <br /> <br />Can be <br />depended on for <br />firm base load <br />water supply for <br />Denver and <br />Aurora. <br /> <br /> <br />COMPARISON OF ALTERNATIVES (CONT'D) <br /> <br />Upstream <br />Dam <br /> <br />Frazil ice at new <br />intake would <br />complicate operation <br />each winter and <br />pose threat of <br />shut down. No <br />operating reservoir <br />ahead of treat- <br />ment plant to <br />intercept frazil <br />ice from tunnel. <br />Operational ice <br />problems would <br />continue down- <br />stream at Platte <br />Canyon diversion. <br /> <br />Although <br />built-in facili- <br />ties for handling <br />ice and sediment <br />should improve <br />intake performance <br />over existing <br />intakes in <br />canyon, there is <br />no operational <br />reservoir to <br />intercept frazil <br />ice ahead of treat- <br />ment plant. <br />Potential for shut <br />down due to ice <br />blockage is high. <br /> <br />Chatfield <br /> <br />No problems expected <br />at Chatfield. but <br />present problems <br />will continue <br />upstream at Aurora <br />and Platte Canyon <br />intakes. <br /> <br />Can be depended <br />on for firm base <br />load water SUDDI v. <br />for Denver. <br /> <br />Joint Use <br />of Rampart <br />Tunnel <br /> <br />Frazil ice at new <br />intake would <br />complicate operation <br />each winter and <br />pose threat of <br />shut down. Ice <br />problems would <br />continue at Platte <br />Canyon intake <br />downstream . <br /> <br />Al though <br />built-in facili- <br />ties for handling <br />ice and sediment <br />should improve <br />performance over <br />existing intakes <br />in canyon. the <br />potential for <br />disruption of <br />supply by ice <br />blockage remains. <br />Not fully <br />dependable for <br />base load water <br />supply in winter <br />months. <br /> <br />Harding Plan <br /> <br />Ice problems would <br />intensify 'at Platte <br />Canyon Diversion <br />and increase threat <br />of shut down. Ice <br />problems would <br />continue at Aurora <br />intake upstream. <br /> <br />Added <br />diversion at <br />this site would <br />intensify already <br />serious opera- <br />tional problems <br />from frazil ice. <br />Potential for <br />shut down due to <br />ice blockage is <br />high. <br /> <br />o <br />o <br />0) <br />.1-"- <br />Lil <br /> <br />Mouth of Canyon <br /> <br />Operation would be <br />relatively free of <br />ice problems due <br />to ice cover in <br />winter, length and <br />volume of reservoir <br />and deep multi- <br />level diversion <br />intakes. Present <br />operational problem <br />at Platte Canyon <br />intake eliminated. <br />Problems upstream <br />at Aurora intake <br />would continue. <br /> <br />Can be depended <br />on for firm base <br />load water supply <br />for Denver. <br /> <br />PLATE 7C <br />