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~ ~ ~ ,~ ~ ~ -~ l -j -I l l l ] J J .-' i U u u Section 5 - CO/OI'(/t!O Woler Use Trends Endange red species recovery-' programs currently under negotiation could impact when and where new water development can occur. Changing conditions in downstream states could impact the fate of Colorado's water supply. ....... ...... Figures 15 to 20 illustrate both the potential magnitude and tim- ing of future M & I water requirements, For example, as illus- trated in Figure 15, on a statewide basis demand could exceed supply as early as 2015 without development of new supplies; and by year 2100 the minimum additional supply required for M & I use is estimated to be about 550,000 acre-feet. If a conser- vative estimate is used for dry year yield, the additional supply required could approach 1,000,000 acre-feet by 2100, . The Metropolitan Supply EIS projected annual Front Range M & I demands of 703,000 acre-feet by 2035, Current projec- tions for developed water available to the region in that year are 418,000 acre-feet, resulting in a potential shortfall of 285,000 acre- feet. The impact of the Endangered Species Act and other environ- mental programs on Colorado water requirements has not yet been quantified. Endangere.d species recovery programs i!1,the Upper Colorado River Basin are being established cooperatively by the Secretary of the Interior, the Western Area Power Administra- tion, the States of Colorado, Wyoming and Utah, water users, environmental groups and others, Recovery programs in the South Platte River Basin are being negotiated between the Secretary of the Interior and the States of Colorado, Wyoming and Nebraska. In each case recovery instream flow appropriations are expected to be of a relatively large magnitude, and impact when and where new water development can occur, However, these instream flow appropriations are made within Colorado's water law system and as such will not-impact existing water rights. Other en vironmen- tal or water quality issues could emerge in coming decades which could exert further demands on the state's water resources, . Because Colorado is a headwaters state, its water resources sup- ply several downstream states, including Kansas, Nebraska, Wyo- ming, New Mexico and Texas east of the Continental Divide and Wyoming, Utah, New Mexico, Nevada, Arizona and California west of the Divide. A number of changing conditions in these states could, over the long term, impact the fate of Colorado's water supply. These include increased demands in Kansas, Ne- braska, California, Arizona and Nevada; a desire for higher qual- ity water at the stare line; and increased monitoring to assure , compliance with interstate compacts. It is impossible to quantify , the potential impact of these or other interstate issues over the , next century, but it is clear that developments in downstream states will put increasing pressure on Colorado's compact deliveries. . 5-10 __ COLoraDO ,._ Farm Bureau