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20 CO~ORADO RIVER STORAGE PROJECT 2, Recorded flow! of the Colorado River at Grand Canyon, 3, The computed theoretical inflow to Lake Mead will be the sum of 1+2, Arrangements would be made to obtain end-of-month con- tents for the monthifor each of the upstream filling reservoirs immedi- ately after the end of the month, Records of discharge of the Colorado River at Grand Canyon are available under the present operating methods, so no change would be required to obtain that record, LAKE MEAD OPERATION 1. The theoretic",1 inflow to Lake Mead would be as computed above. : ~, Forecasts of Dake Mead inflow would be made exactly as they are made under pre~ent operating criteria, and the release from Hoover Dam to meet predetermined requirements based on (a) flood control under regulations being used prior to Glen Canyon; (b) irrigation orders and predetermined levels of Lake Mohave; (e) energy produc- tion schedule as computed from June 1 forecast each year with the firm schedule of g~neration used if the resulting end-of-December content will stay above 17 million acre-feet, In years of less than firm, as indicated by the theoretical study, that percentage 01 firm will be generated that will permit the end-of-December content to be 17 million acre-feet or: downstream water requirements will be released from Hoover Dam, whichever is the greater. Releases to meet down- stream requirements will be made each year regardless of resulting reservoir elevations; The committee on integration and interests of the upper basin will be consulted at the beginning of each operating year, and the proposed theoretical study will be discussed. Actual programs of operation of Hoover Dam wiIl be determined at the reguIarl;yscheduledi integration committee meetings, It will be necessary to make some assumptions with respect to dis- tribution of firm en:ergy during a theoretical operation year as actual firm will not usuaIly be attained under the actual operating condition, This distribution df firm energy for the theoretical study will be determined as that ,which would be produced by the release of water to meet the current, estimate of downstream requirements during each of the months of J*ne through September and March through May, and the balance distributed to the months of October through Febru- . ary in a pattern siinilar to that adopted by the regular integration committee, or a river operation committee if established, for the actual operation of Hoover powerp1ant during that year of operation. These computatiQns on a monthly basis will be carried on concur- rently with the actj1al recorded operation of Lake Mead and Hoover Dam to compute tlle deficiency in Hoover firm energy. Attached is a eet of computati\lll forms to be used in the dctermination of the deficiency in firm energy deliveries at Hoover powerplant, The forms will be kept current each month by the Bureau of Reclamation, and copies will be furnished to all interested pm'ties as soon as possible after the end of each month, , .