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<br />0'751 <br /> <br />Draft Water and Storage Needs Assessment <br />SECWCDI Assessment Enterprise <br />December 10, 1998 <br /> <br />2.2.1.8 Colorado Springs Utilities <br /> <br />Colorado Springs Utilities provides water to a service area population of 341,810. Water is <br />supplied from four major sources: local supplies from Pikes Peak watershed; the Blue River <br />Pipeline; the Homestake Creek Pipeline; and the Fryingpan-Arkansas Project via the Fountain <br />Valley Pipeline. Other supplies include Denver Basin wells and the Colorado Canal Exchange <br />Program. Developed supplies total 128,000 afper year of firm yield (144,600 af average yield). <br />Water resources owned by Colorado Springs Utilities include "reusable" supplies and "native" <br />supplies, as identified below: <br /> <br />Developed "Reusable" Supplies <br />Blue River/Homestake <br />Fry-ArkfTwin Lakes <br />Arkansas Basin <br /> <br />Avera!!e Yield (aO Firm Yield (aQ <br />27,700 24,000 <br />42,900 40,000 <br />15,600 13,800 <br />24.800 21.200 <br />111,000 99,000 <br />9,800 9,200 <br />22.700 J..8.JQQ <br />32,500 27,900 <br />t.tOO JJJ!!! <br />144.600 128,000 <br />76.300 67.100 <br />220.900 195.100 <br /> <br />Return Flows <br /> <br />Subtotal <br /> <br />Developed "Native" Supplies <br />Arkansas Basin <br /> <br />Local Supplies <br /> <br />Subtotal <br /> <br />Developed Non-Potable <br /> <br />TOTAL (DEVELOPED) <br /> <br />Undeveloped Supplies <br /> <br />TOTAL <br /> <br />The finn yield numbers presented in the above table are constrained only by local conveyance <br />limitations and water rights. However, because of the integration of the Colorado Springs raw <br />water collection system, finn yield is significantly impacted by additional factors including <br />storage capacity, non-local conveyance capacity and the relative timing of supply and demand. <br />The combined impact of these factors can only be assessed through detailed modeling of the <br />system with a network flow model such as MODSIM. Results of such a modeling effort are <br />presented in the 1998 Operations and Yield Model Report by Montgomery Watson. In that <br />report, a term called "Effective Finn Yield" is defined as the maximum demand level for which <br />water can be supplied over the entire 30 years of hydrologic data (1966-1995) with no shortages <br /> <br />m GEl Consultants, Inc. <br /> <br />2-14 <br /> <br />97411\Final_I\TEXT-A WPD <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />,I <br />I <br />I <br />