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<br />. <br /> <br />. <br /> <br />GVWM Flow Protection Plan <br /> <br />December 19, 1994 <br />4:02pm <br /> <br />DRAFT <br /> <br />and are called out by a senior water right cannot request releases from GMR Historic Users Pool <br />(HUP) and are forced to cease diverting unless they have some other source of replacement <br />water. The State Engineers Office considers all water rights with irrigation and domestic uses <br />that were perfected before January 1984 to be GMR beneficiaries. In 1977 (historically a very <br />dry water year) these beneficiaries requested approximately 66,000 af of releases from the <br />100,000 GMR power pool. This event was instrumental in defining and quantifying the <br />66,000 afHistoric Users Pool (HUP). TheHUP is a portion of the 100,000 afpowerpool, not <br />in addition to the pool. The HUP is accounted for as a separate reservoir. Therefore, on paper, <br />when the pool is empty, the reservoir is dry. <br /> <br />River Administration <br />Before discussing a protection plan for conserved water from the Grand Valley Project it is <br />necessary to have an understanding of Colorado River administration as applies to the Cameo <br />Call, The number of variations of what can happen in anyone water year are seemingly <br />unlimited. The following discussion will attempt to step through what may be called a "normal" <br />water year if one really exists. The following discussion may imply that the Cameo demand <br />stays at 2,260 throughout the irrigation season where in actuality there is variation. For this <br />discussion the Cameo demand will be 2,260 unless a different value is beneficial for <br />demonstration purposes. <br /> <br />Prior to the beginning of runoff and the irrigation season there is usually enough water at the <br />~ameo gage t? su~ply ~e Grand V~ey Power Plant. During this ~J!i2~~~4'i9.nJf<>J}in..s.~~lYJGp;:' ' <br />nght on the nver IS qUIte commonly the Shoshone Power Plant!~ the nver flows begm to as . <br />increase at Cameo, the Shoshone call usually stays on, and the Cameo rights will not need to <br />place a pre-peak call. By about April 1 Cameo irrigation diversions begin. If there is not <br />enough snowpack in the lower portions of the basin, it is possible, but infrequent, for one of the <br />Cameo water rights to place a pre-runoff .call. <br /> <br />Uostream iuniors - During periods of peak demand the Cameo water rights are satisfied <br />as long as the Cameo gage is above 2,260 cfs. Runoff usually stays above this amount through <br />May and June and commonly well into July. But as flows decrease at Cameo, the effect of the <br />Cameo group begins to reach upstream. With the Cameo demand at 2,260 cfs, the Cameo group <br />can place a call on the river as soon as the natural flow at the Cameo gage falls below 2,260 cfs. <br />In this case the most junior right in the group is the GVIC 120 cfs right, so GVIC will place the <br />call. Starting from the most junior water right, -..."'-1, ,,1 '1I0R- upstream junior diverters will <br />then be directed to cease diversions until the flow at Cameo returns to 2,260 cfs. If those <br />upstream water rights are GMR HUP beneficiaries, then instead of ceasing diversions, the <br />Division Engineer will direct releases from GMR HUP to replace the consumptive use portion <br /> <br />11 <br />