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, , . . GVWM Flow Protection Plan December 19, 1994 4:02pm DRATI' amount of water. Up until this point the flow at Cameo has been maintained at about 2,260 cfs by either calling out upstream juniors or releases from Green Mountain Reservoir. But as the natural flow continues to fall at the Cameo gage the 400 cfs power right receives less water and the flow at Cameo is not augmented by additional GMR releases.y\._ , '_VIl.- ,,-l; ~ ,,'_~u ..i(\"U' t.l/fl+jr\....- Through operation of the check and the associated exchange, power can' De produced even with this decreased supply. Instead of decreasing the amount of water diverted at the Grand Valley Project diversion dam, an out of priority diversion for the 400 cfs right can be made, the water is then run through th~r plant, the radial gates in the tailrace channel are lowered, !iac'''',5'''a water in the tailrace Vi' "run back upriver through the check channel, and .. return to the river upstream of the GVIC diversion dam. This process is known as checking and is also called operating the Orchard Mesa check. The summation of water rights of the Cameo group is 2,350 cfs (the 2,260 we've been working with is to the physical capacity of the Government !lig~~f}ol Th~r~ore, wiWe the power right is the controlling water right'~the river ~\^W to fall5(1f1'l.~950 cfs at Cameo (2,260 - 310) before any additional releases are made from GMR to the Cameo group. The quantity of flow in the "check" exchange is directly related to the river supply at the Cameo gage. As the natural flow decreases from 2,260 to 1,950 cfs the exchange is operated from 0 to 310 cfs. From a natural flow at the Cameo gage of 2,140 (2,260 - 120 releases for the junior GVIC water right) to 1,830 cfs (2,140 ' 310 power right) the calling or controlling water right is the 400 cfs power right. While the river is in this flow range, as the flow at the Cameo gage decreases, the flow in the 15-Mile Reach decreases. At the beginning of this natural flow range the flow in the Reach is about 581 cfs and at the end of the range, it has fallen to 271 cfs. Whether or not OMID operates the exchange makes no difference in 15-Mile Reach flows because if the out of priority diversion was not made at the Grand Valley Project diversion dam it would only stay in the river until it was diverted at the GVIC diversion dam. Administration and the GVWUAIUSA 730 cfs water ril!ht - The next right to come into priority in the Cameo group is the 730 cfs irrigation right. Since it is anI-irrigation use, it is a GMR HUP beneficiary. But before any additional releases are made for the Cameo demanJ4....,el ~ any water rights junior to the 730 cfs right and senior to the power right are called out:" "'Since f':-~;"~-1c only the irrigation and domestic water rights between the 400 cfs power right and the 730 cfs <>, toL ''''1''''''''-41 irrigation right are GMR ben,~f.l.'ii~Jj~~~.~ater rights not in either of these categories are u.)..,1..- required to stop diveningll( fThe irrigation ana domestic rights are technically called out but simultaneously replacement releases are made from GMRj-ll.lq, 13