Laserfiche WebLink
<br />Glen Canyon Dam 1997 Annual Plan of Operations <br />prepared in accordance with the Operating Criteria <br />developed for the Grand Canyon Protection Act (GCPA) <br /> <br />Under most probable inflow conditions in water year 1997, Glen Canyon Dam is expected to <br />release about 10.2 MAF through the Grand Canyon to Lake Mead. This is about 2 MAF greater <br />than the minimum objective release and is the result of storage equalization with Lake Mead as <br />required under the 1968 Colorado River Basin Project Act. Lake Powell is expected to peak at <br />elevation 3686 feet, 14 feet from full. <br /> <br />Monthly release volumes from Glen Canyon Dam during 1997 are expected to range from <br />600,000 AF to 1.200.000 AF as discussed in the 1997 Annual Operating Plan prepared under the <br />1968 Colorado River Basin Project Act. Projected daily allowable fluctuations therefore will be <br />6,000 cfs or 8,000 cfs (see criteria). With the projected monthly release volumes, it is likely that <br />peak daily releases will exceed 20,000 cfs only during the months of July and August, when <br />monthly release volumes are at their highest for the year. Minimum releases of 5,000 cfs at <br />night and 8.000 cfs during the day and ramping rates of 4,000 cfslhr increasing and 1,500 cfslhr <br />decreasing will be followed. All of the above is outlined in the Record of Decision <br />implementing the preferred alternative of the Glen Canyon Dam Environmental Impact <br />Statement. <br /> <br />Since the hydrologic condition of the Colorado River basin and the projected operation of Lake <br />Powell are not expected to create a dam safety condition this year (i.e. no flood releases), a <br />beach/habitat building flow is not planned in 1997. In addition, every measure will be taken to <br />prevent a powerplant bypass this spring in order to preserve the environmental enhancement <br />accomplished by the beach/habitat building flow test in April 1996. Water year 1997 will have a <br />January I, 1997, Lake Powell storage content of greater than 19 MAF, therefore a beach/habitat <br />maintenance flow of powerplant capacity is also not planned. <br /> <br />This plan is prepared in conformance with Section 1804(c)(I)(A) of the GCPA. Any changes to <br />the plan would require reconsultation in accordance with this Act. Because this is the initial year <br />for this plan of operations, it will be implemented on December I, 1996, and run through <br />September 30,1997. <br />