Colorado's Plan for Future Depletions (3)

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I. SOUTH PLATTE RIVER BASIN A. Population Estimates. The 1997 "Population Baseline" for Colorado's Future Depletions Plan is: 1. Northern Region -- Boulder, Weld, Larimer, Washington, Morgan, Sedgewick, Logan, Phillips (701,470) 2. Central Region -- Denver, Jefferson, Adams, Clear Creek, Gilpin, Park (I,766,207) 3. Southern Region -- Arapahoe, Douglas, Elbert (194,602) Within 90 days after the inception of the Program, the Colorado State Demographer shall report the amount by which the population of each region is expected to increase over the Population Baseline by the end of the initial reporting period ("projected Population Increase"). At the end of each reporting period, Colorado will provide the Governance Committee an estimate by the Colorado State Demographer of the actual population in each region (which shall be the Population Baseline for the next suQCeeding reporting period), and an estimate of the projected Population Increase for the next succeeding reporting period. B. Water Use and Effect Assumutions. Assumptions concerning per capita water use, supply source mix by region, and accretive/depletive effects of each supply source (including monthly distributions of said effects), set forth in this paragraph and the table below, represent reasonable estimates at the outset of the program, and may be modified by the Governance Committee based on information made available to that Committee by Colorado or others. The gross per capita water requirement in the South Platte River Basin in Colorado will be assumed to be 0.27 af/yr, with 35% consumptive use assumed for all municipal purposes, and 45% consumptive use assumed for agricultural irrigation purposes. It is anticipated that new water related activities within the three regions will be from six sources of supply to serve the Population Increase, each with a different depletive or accretive effect on flows in the South Platte River. The three regions will develop the six sources of supply in different combinations. It will be initially assumed that the sources of supply for new water related activities will be developed in the combinations and will have the accretive or depletive effect shown below: ? Source Northern Central Southern Accretive (or Depletive) Region Regimn Region Effect New Transbasin Imports 40% 30% 20% 64% Nontributary Groundwater 0% 10% 50% 68% Ag. to Urban Conversion 35% 5% 0% 10% Conservation 5% 15% 10% 0% Wastewater 10% 25% 10% (41%) Exchange/Reuse Native South Platte Flows 10% 15% 10% (27%) October 24, 2006 Colorado Depletions Plan 2