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<br />Illl. NICK C. JUANNWES <br />;JUlll,,,ry 1:', 19U2 - 142}/!;I <br />P"lJe 1hree <br /> <br />Lo the similarity of Lhe result::;, i::; thal Lhe period::; when additional waLer <br />wa::; available for ::;Lor"ye did not lJelle1'ally coincide wiLh Lho::;e periods when <br />leyner-Cottonwood Ditch waleI' righLs were in priority. <br /> <br />The Denver Waler Dep"rtment has compiled information relaled to the <br />hisLoric return flow of waLeI' from iLs service area. This data, for the 1964 _ <br />1979 period shows that the aver"lJe ,;nnual reLurn flow to the river system is <br />55.2 percent of the w"Ler supplied. 1h" minim"m <.tver"ge monthly figure of }5.2 <br />percent occurs during July, while the m<3ximum average monthly figure of 93.2 <br />percent occurs in December. The average annual consumptive use figure (water <br />not returning to the stream system) b<.t:;ed on this data is 44.8 percent. <br /> <br />In conclusion, the proposed KeysLone Reservoir will store an additional' <br />161 acre-feet of water per year. This storage will occur during periods when <br />river calls in South Platte River Basin are not affecting water rights in the <br />old Water District No.6 and that Narrows water rights are in priority. Assuming <br />the applicability of the 44.8 percent factor from lhe Denver Water'Department <br />data, the consumptive use associated with the additional water stored by Keystone <br />Reservoir is approximately 72 acre-feet per year. Further, these results clearly <br />demonstrate that the proposed Keystone Reservoir will increase the beneficial <br />consumptive use of Colorado's compact entitled waters as provided for in Senate <br />Bill No. 439. <br /> <br />Yield data for the Town's existing system (300 acre-feet storage capacity + <br />South Boulder Canyon Ditch Rights) and the expanded system (existing system + 700 <br />acre-feet Keystone Reservoir + Leyner-Cottonwood Ditch Rights) is presented in <br />Table-2. 'This information was developed by the use of a mass curve using the <br />results obtained from an operation study conducted for the feasibility study which <br />covered the 1950 - 1969 period. The average annual yield of the existing system <br />is 130.9 acre-feet. The average annual yield of the expanded system is 365.7 <br />acre-feet. The additional water captured, presented in Table-I, represents water <br />captured over and above the yield data figures presented in Table-2 for the <br />expanded system. <br /> <br />If you have any questions regarding the contents of this report, please let <br />me know. <br /> <br />Very truly yours, <br /> <br />WATER RESOURCES CONSULTANTS, INC. <br /> <br />~,\.l;;W5 <br /> <br />A. S. Andrews, P.E. <br />President <br /> <br />Attachments: Table-l and Table-2 <br />cc: - Trustee Horst Bach/Town of Erie <br />- Mr. David N. Sonnesyn/Special Water Counsel of <br />the Town of Erie <br /> <br />ASA/ck <br />