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I. SOUTH PLATTE RIVER BASIN <br />A. Population Estimates. As part of getting Governance Committee approval for its Future <br />Depletions Plan in 1998, Colorado provided to the Governance Committee an estimate by the <br />Colorado State Demographer of the population of those portions of the following Colorado <br />counties located within the South Platte River Basin, as of the effective date of the Cooperative <br />Agreement (1997), in the following regions: <br />1. Northern Region -- Boulder, Weld, Larimer, Washington, Morgan, Sedgewick, Logan, <br />Phillips (701,470) <br />2. Central Region -- Denver, Jefferson, Adams, Clear Creek, Gilpin, Park (1,766,207) <br />3. Southern Region -- Arapahoe, Douglas, Elbert (194,602) <br />Said estimate is included in Colorado's Future Depletions Plan Interactive Tool and will be the <br />"Population Baseline." At the same time, Colorado also provided to the Governance Committee <br />an estimate by the Colorado State Demographer of the amount by which the population of each <br />region was expected to increase over the Population Baseline by the end of the initial reporting <br />period, which was 2002. Such increase was to be considered the projected "Population Increase." <br />Because of the extension of the Cooperative Agreement to July of 2005, Colorado will report, by <br />the end of 2004, a new "Population Increase" estimate for the initial reporting period, which will <br />now end in 2007. At the end of each reporting period, Colorado will provide to the Governance <br />Committee an estimate by the Colorado State Demographer of the actual population in each <br />region (which shall be the Population Baseline for the next succeeding reporting period), and an <br />estimate of the projected Population Increase for the next succeeding reporting period. <br />B. Water Use and Effect Assumptions. Assumptions concerning per capita water use, supply <br />source mix by region, and accretive /depletive effects of each supply source (including monthly <br />distributions of said effects), set forth in this paragraph and the table below, represent reasonable <br />estimates at the outset of the program, and may be modified by the Governance Committee based <br />on information made available to that Committee by Colorado or others. The gross per capita <br />water requirement in the South Platte River Basin in Colorado will be assumed to be 0.27 af/yr, <br />with 35% consumptive use assumed for all municipal purposes, and 45% consumptive use <br />assumed for agricultural irrigation purposes. It is anticipated that new water related activities <br />within the three regions will be from six sources of supply to serve the Population Increase, each <br />with a different depletive or accretive effect on flows in the South Platte River. The three regions <br />will develop the six sources of supply in different combinations. It will be initially assumed that <br />the sources of supply for new water related activities will be developed in the combinations and <br />will have the accretive or depletive effect shown below: <br />-23- <br />