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<br />001JH <br /> <br />comprise a formal interpretation of the laws and regulations. For a <br />more detailed description of an item, refer to the section number spec- <br />ified in brackets. <br /> <br />(1) An objective minimum annual release from Lake Powell of <br />8.23 million acre-feet. [8.2.1] <br /> <br />(2) Additional water is released from Lake Powell to equalize the <br />active contents of Lakes Powell and Mead by the EOWY (end of the <br />water year) if the total upper basin projected EOWY active contents <br />is greater than the storage required by section 602(a) of Public <br />Law 90-537, and if the projected EOWY active contents of Lake Powell <br />are greater than the projected EOWY active contents of Lake Mead. <br />[8.2.2] <br /> <br />(3) The additional water released in item (2) above is constrained <br />to the extent that it can be passed through the Glen Canyon <br />Powerplant. Any water thus retained in Lake Powell to avoid bypass <br />of water at the Glen Canyon Powerplant will be released in subsequent <br />months if possible. [8.2.2] <br /> <br />(4) The value for the 602(a) storage quantity used to control the <br />equalization of Lakes Powell and Mead is determined by considering <br />several factors including: historic streamflows, the most critical <br />period of record, estimated future depletions in the upper basin, an <br />objective minimum annual release from Lake Powell of 8.23 million <br />acre-feet, an allowable shortage in the upper basin 'of 6.12 percent, <br />sediment accumulation in Lake Powell and the objective of maintaining <br />minimum power pool in Lake Powell. [8.2.4] <br /> <br />(5) Normal deliveries to Mexico of 1.515 million acre-feet of water <br />are scheduled annually. This value includes 15,000 acre-feet of <br />water for surety of meeting the Mexican Water Treaty obli9ation. <br /> <br />(6) Flood control is implemented following the "Recommended Field <br />Working Agreement between Department of the Interior, Bureau of <br />Reclamation, and Department of the Army, Corps of Engineers." In <br />months August through December the target contents for Lake Mead are <br />set to obtain the monthly flood control space specified in the <br />working agreement. Space building releases are held to.a maximum of <br />28,000 ft3/s. In months January through July a minimum flood control <br />release is computed based on the forecasting procedures described in <br />the working agreement. A minimum flood control space in Lake Mead of <br />1.5 million acre-feet is maintained at all times. [8.3.1] <br /> <br />(7) Shortages are imposed on Arizona, Nevada, and Mexico as <br />Lake Mead drops below specified elevations. [8.5] <br /> <br />(8) The model has the optional capability to simulate releases from <br />Lake Powell in excess of the minimum annual release and from <br />Lake Mead in excess of downstream demands in order to avoid antici- <br />pated spi 11 s from Lakes Powell and Mead. Thi s is known as the <br />surplus strategy. [8.4] <br /> <br />10 <br />