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I) -a~ ~ . /) /J .::>').-= -- (jiG.;?, FI~~ mk_ GEORGE DEUkMEJIAN, ao-nih( @M 002651 . STATE Of CALIfORNIA-THE RESOURCES AGENCY Co'LORADO RIVER BOARD OF CALIFORNIA 107 SOUTH IlROADWAY, ROOM 8103 LOS ANGELES, CALIFORNIA 90012 (213) 62~O October 23, 1986 Mr. Edward M. Hallenbeck Regional Director Lower Colorado Regional Office U.S. Bureau of Reclamation P.O. Box 427 Boulder City, Nevada 89005 Dear Mr. Hallenbeck: with enactment of the Colorado River Floodway Protection Act, Public Law P.L. 99-450, on October 8, 1986, a major step has been taken to reduce the threat of loss of human life and to protect health and safety and minimize damage to property and natural resources along the Colorado River downstream from Davis Dam. The Floodway established by the Act is consistent with and essential for effective flood control operations and the protection of water conservation. The Act sets forth a very ambitious time schedule for the Secretary of the Interior with respect to defining the specific boundaries of the Colorado River Floodway downstream of Davis Dam, capable of accommodating either a one-in-one hundred year river flow consisting of controlled releases and tributary inflow or a flow of 40,000 cubic feet per second, whichever is greater. As enunciated in the House and Senate Congressional Records and Committee Reports relative to the Act, the analysis of the one-in-one hundred year river flow should represent a realistic one-in-one hundred year probability of such flow occurring in any reach of the river at a given time and should not arbitrarily assume that flood inflows from all tributaries occur simultaneously. , This will require, as provided for in subsection 5(b)(1) of the Act, the prior study of tributary flood flows downstream of Davis Dam. The Secretary's tributary study and boundary determinations are to be undertaken, pursuant to subsection 5(b) (1) of the Act, in consultation with the seven Colorado River Basin states, represented by persons designated by the Governors of those states, the Colorado River Floodway Task Force, and any other interested parties. The Secretary has eighteen months after the date of enactment of the Act to complete the study of tributary floodflows and define the specific boundaries of the Colorado River Floodway. Accordingly, it is imperative to the orderly and timely development of the floodway boundaries that the Governor- appointed representatives of each of the Basin states be