|
<br />APPENDIX A
<br />
<br />OPERATING CRITERIA FOR GLEN CANYON DAM,
<br />INACCORDANCE~THTHE
<br />GRAND CANYON PROTECTION ACT OF 1992
<br />
<br />l;~)
<br />,,};-.,o"
<br />
<br />These Operating Criteria are promulgated in compliance with section 1804 of Public Law
<br />102-575, the Grand Canyon Protection Act of 1992. They are to control the operation of
<br />Glen Canyon Dam, constrUcted under the authority of the Colorado River Storage Project
<br />Act. These Operating Criteria are separate and apart from the Criteria for Coordinated Long-
<br />Range Operation of Colorado River Reservoirs prepared in compliance with the Colorado
<br />River Basin Project Act of 1968.
<br />
<br />1. Annual Report
<br />
<br />As required in the Grand Canyon Protection Act, a report shall be prepared and submitted to
<br />Congress annually that describes the operation of Glen Canyon Dam for the preceding water
<br />year and the expected operation for the upcoming water year, The annual plan of operations
<br />shall include such detailed rules and quantities as are required by the Operating Criteria
<br />contained herein. It shall provide a detailed explanation of the expected hydrologic
<br />conditions for the Colorado River immediately below Glen Canyon Dam.
<br />
<br />2. Review of Criteria
<br />
<br />The Secretary shall review these Operating Criteria as the result of actual operating ,',
<br />experiences to determine if the Operating Criteria should be modified to better accomplish
<br />the purposes of the Grand Canyon Protection Act. Such a review shall be made at least every
<br />five years in consultation with the appropriate federal agencies, Governors of the Colorado
<br />River Basin States, Native American tribes, representatives of academic and scientific
<br />communities, environmental organizations, the recreation industry, and contractors for the
<br />purchase of federal power produced at Glen Canyon Dam.
<br />
<br />3. Specific Operational Constraints
<br />
<br />The plan of operations will follow the description of the preferred alternative (Modified Low
<br />Fluctuating Flow) in the GCDEIS and the ROD. The specific criteria are as follows:
<br />
<br />Minimum Releases - 8,000 cfs between 7:00 a.m. and 7:00 p.m. and 5,000 cfs at night.
<br />
<br />Maximum Releases - 25,000 cfs. Several circumstances warrant exception to this
<br />restriction. These are the beach/habitat-building flows and the habitat maintenance flows
<br />(both described below) and the release of large volumes of water to avoid spills or floodflow
<br />releases from Glen Canyon Dam. These latter releases would most likely result from high
<br />mowmelt runoff into Lake Powell; if such hig1l releases above 25,000 cfs are required, they
<br />shall be made at constant daily flow rates.
<br />
<br />.~..."!. ~_~~'''.;''::".~~~'''''!-"(~~''''','~:'''':l:.'':..':~~'l",!l''-'...'';,...~.....;~.=-"~t,:,:"_,~",,,,,,,,,,,,,,,,"';''''.':';.l' ...~...,.. ,,,.~ --..J-'............. ~ ,.'~' .,' ';<.-:. '.',. (.- ,.... ".~ : ~~'-" _.~ ~~~.,............. "'---~'~
<br />
|