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<br />Metropolitan Water Supply Investigation <br /> <br />MWSI Results <br /> <br />I <br /> <br />current project participants is expected to ultimately occur. It was therefore concluded <br />that Windy Gap water could potentially be available for conjunctive use only as an <br />interim source. District and Subdistrict Board policies effectively prohibit the use of <br />Windy Gap water outside of District boundaries. Major new storage and conveyance <br />facilities would be needed to deliver this supply into the metro Denver area. For these <br />reasons this source was not studied further. <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 /> <br />Local Tributaries <br /> <br />The potential availability of surface flows from Cherry and Plum Creeks was briefly <br />examined using historical stream flow records and call data. This analysis revealed that <br />an average of 4,000 to 5,000 acre-feet of excess surface flow could be available, but that <br />these flows would occur extremely sporadically and would require storage capacity in <br />excess of 50,000 acre-feet for regulation. This source was not investigated further <br />because of the relatively small yield, the need for major storage in rapidly developing <br />areas. This source could be incorporated into a larger conjunctive use plan, especially if <br />new surface storage were available in offCstreamlocations or via flood control storage <br />reallocation at Cherry Creek and Chatfield reservoirs. <br /> <br />South Platte Flows Below Denver <br /> <br />The South Platte River below Denver has significantly more surface water potentially <br />available for conjunctive use than at upstream locations due to urban return flows <br />(wastewater and lawn irrigation returns), surface flows from local tributaries, and <br />stormwater runoff from urban areas. <br /> <br />The potential availability of South Platte flows below Denver was examined under future <br />conditions as reflected in Denver's Near-term scenario. Excess flows at the Burlington <br />Ditch and at the Henderson gage were estimated taking into account existing irrigation <br />uses and future municipal uses as reflected in P ACSM. These two locations were <br />examined because the Burlington Ditch is a major conveyance structure that could be <br />used to divert additional surface supplies under a conjunctive use arrangement, and the <br />Henderson gage reflects virtually all of the metro Denver region's return flows. <br />Estimates of excess South Platte flows below Denver are shown in Figure 6. <br /> <br />This source represents a major potential surface supply available for a conjunctive use <br />plan. However, it is located much farther from the Denver Basin groundwater users in <br />the region and from existing surface water reservoirs other than Barr Lake. Therefore <br />major conveyance and storage facilities would be needed to make use ofthis supply in a <br />conjunctive use manner, except possibly for those municipal providers and water uses <br />located in the northeast quadrant of the metro Denver region. In addition, the water <br />quality of this supply shows the effects ofretum flows from a major urban region and <br />therefore this source is not in great demand as a municipal supply among metro Denver <br />providers. Consequently the MWSI did not initially examine conjunctive use concepts <br />using this water supply. The potential for using this supply is being considered in the <br /> <br />Prepared fOT the Colorado Water Conservation Board, Colorado Department of Natural Resources by <br />l-Ivth.n<:nh...... Rp<:nllrrp rnn<:ult:mt<: 100' W~lnllt ~tTpf'f ~l1itp 100_ RcmlrlP.T_ ro R0102 <br /> <br />I <br />I <br />I <br />I <br />I <br /> <br />46 <br />