PRRIP: Colorado's Depletions Plan

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' 3. the operations and effects of projects to mitigate new depletive effects; ( 4. an estimate of the projected Population Increase for the n[ext succeeding reporting period; 5. estimates of the net accretive/depletive effects and Cumulative Effect for the next reporting period; and 6. net changes in irrigated agricultural acreage, using readily available data. Colorado will also submit annual information reports to the! Governance Committee estimating population increase in each of the three regions, and describing water sources used to supply new water related activities including type of water source, works used and water quantities supplied. Colorado will promptly reportto the Governance Committee any new information that significantly affects assumptions relied upon in this Program. E. Determination of Cumulative Effect -- Initial Reporting Period. Within 90 days after the inception of the Program, Colorado will provide to the Governance Committee a calculation of the average monthly distribution of 1:he: Cumulative Effect for anticipated water related activities in the South Platte River Basin in Colorado for the Initial Reporting Period. The calculation will be based on the projected Population Increase for that period, and the water use and transit loss assumptions described above or as may be modified by the Governance Committee. The Cumulative Effect as approved b.y the Governance Committee will determine the mitigation measures that will be undertaken by Colorado during the Initial `?---- Reporting Period. F. Determination of Cumulative Effect -- Sulbsequent Reportin.g Periods. Colorado will monitor actual water use and development in the South Platte River Basin in Colorado beginning July 1, 1997. At the end of the Initial Repoitirig Period, and at the end of each Subsequent Reporting Period, Colorado will report to the (Jovernance Committee for its review and approval any adjustments in the Population Increase arid in the Cumulative Effect for that period. Such adjustments will serve as the basis for calculations for the next succeeding Reporting Period. Any resulting increase or decrease in Cumulative Effect will be added to or subtracted from the Cumulative Effect to be mitigated in the next :;ucceeding Reporting Period. G. Mitipation of Cumulative Effect. The signatories assume that the Cumulative Effect for any annual ?period is expected to be a mix of net accretions during the fall, winter and spring period, and net depletions in the late-spring to mid-summer period, resulting in an estimated total seasonal net depletive effect on an order of magnitude of less than 1,800 af/yr for each 100,000 additional people in the South Platte River Basin in Colorado. Based on these assumptions, Colorado will, in each Reporting Period, undertake such re-regulation projects within Colorado as are necessary to shift water flows at a point upstream from the Colorado-Nebraska state line and downsti-eam from the last diversion in Colorado, from periods of net accretion to periods of net depletion. The re-regulation projects divert water in priority through existing ditch head gates or wells ciownstream of Colorado's ? Octobec 24, 2006 Colorado Deple!ions Plan 4