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<br />154G <br /> <br />August 19. 1999 <br /> <br />evaluated increases in the Lake Meredith normal pool elevation of 2, 4, 6. 8 and II ft. which <br />result in total storage volumes of 56.000 to 116.000 acre-feet. <br /> <br />Modeling Approach to Evaluation and Analysis of Storage Utilization <br /> <br />Potential sources of inflow to the additional storage space in Lake Meredith include: <br />. Winter Water; <br />. Exchanged Water (e.g. CSU return flows for exchange to Pueblo Reservoir); <br />. Project water for release to Fort Lyon and Holbrook Canals. <br />. Water purchased and transferred (e.g. storage to regulate replacement water for well <br />pumping). <br /> <br />Storage requirements for storage of return flows for future exchange to Pueblo Reservoir would <br />be determined through the calculation of the daily exchange potential using Ark-Ex to compile <br />the exchanges on a monthly basis and using MODSL\1 to determine required storage volumes at <br />Lake Meredith. <br /> <br />Potential beneficiaries of additional storage space in Lake Meredith could include: <br />. Winter Water downstream of Lake Meredith <br />. Project water for release to Fort Lyon and Holbrook Canals <br />. CSU storage of return flows for exchange to Pueblo Reservoir <br />. Storage to regulate replacement water for well pumping <br /> <br />The MODSIM model will be modified with an additional node to account for Lake Meredith <br />Storage as well as the addition of native Arkansas River inflows. In addition. the project water <br />agricultural demand will be split between demands upstream of Lake Meredith and those <br />downstream of Lake Meredith. The MODSI:M model will be used to determine storage <br />requirements for delivery of project water from Lake Meredith and resultant reduction of storage <br />space requirements in Pueblo Reservoir project deliveries (e.g. Fort Lyon Canal). <br /> <br />Storage requirements for winter water storage would be calculated through the analysis of <br />historical winter water storage records to determine winter water use downstream of Lake <br />Meredith outlet works discharge to the Arkansas River. SECWCD staff would provide this <br />storage volume. <br /> <br />Storage requirements for regulation of replacement water for well pumping would be determined <br />through the analysis of the spatial requirement for augmentation water for well pumping. The <br />well augmentation organizations within the SECWCD boundaries would provide this storage <br />volume. <br /> <br />Gravel Lakes Storage <br /> <br />The conversion of sand and gravel pits to water storage facilities is becoming increasingly <br />common among municipal water providers in Colorado. Along the South Platte River in the <br />Denver Metro area, dozens of such projects are already built or in the planning stages. Typically <br />in the Denver area. gravel lakes storage is utilized to facilitate exchanges. Water is diverted from <br /> <br />7 <br />