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Lower South Platte Water Conservancy District Agenda Item 7b, May 21-22,2001 Updated June 6,2001 This project is a high priority and eligible for a CWCS Small Project loan. If the project is not completed this spring, it may be necessary for the State Engineer to curtail junior wells in summer 2001, Delaying the project until summer 2002 would pose a hardship on constituents served by the borrower due to the loss of crops caused by diminished water supply. Feasibility Studies Jon Altenhofen, P.E., NCWCD, has completed a cost estimate and a final draft feasibility study for the project. The study includes an assessment of alternatives available to the District for augmentation of junior wells. The Lower South Platte Water Conservancy District The LSPWCD was formed in accordance with the Water Conservancy Act of Colorado with decree date of May 8, 1964. There are 375,000 acres within the District assessed at 'Y2 mill. These taxes are collected through the county tax collection process. In 1993 the LSPWCD established (by resolution) a water activity enterprise in accordance with CRS 37-45.1-101. The Enterprise is authorized to take on debt repayable from its revenues. Water Riahts The augmentation well of this project will operate as a new junior water right. The new well will be permitted for 3,000 gpm (6.7 cfs) to pump an average of 1,500 acre-feet per year for purposes of augmenting and replacing the depletions of irrigation wells in Water District 64. The Substitute Water Supply Plan of LSPWCD will be amended to deal with State Engineer water right administration and permitting issues for the construction and use of this new augmentation well. The recharge portion of this project will come under the JID recharge water right application Case No. 95CW282. Proiect Description Three alternatives were analyzed in the feasibility study: 1. The no-action alternative. 2. Construct an augmentation well and groundwater recharge ponds. 3. Construct a reservoir. Alternative 2, Construct an augmentation well and groundwater recharge ponds, was the preferred alternative because of the low cost per acre foot, and the speed with which the project could be placed on line (summer 2001), Alternative 3, Construct a reservoir, was ruled out due to cost. The no-action alternative was considered unacceptable since it could lead to curtailment of junior wells on the lower South Platte River. Selected Alternative 2 consists of the following: Table 1: LSPWCD Pro"ect Costs Estimated Cost $45,000 $15,000 $10,000 $15,000 $15,000 $20,000 $120,000 2