WSP09796

• File Number: 8220.200.06.M
• Description: Imperial Dam
• Basin: Colorado Mainstem
• Date: 1/1/1981
• Author: USDOI/BOR
• Title: Regional Director's Report of Flows and Diversions at Imperial Dam and All Actions Affecting the Coordination Thereof - Calendar Year 1981
• Water Supply Pro - Doc Type: Annual Report

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2. The actions related to the care, operation, and maintenance of works
transferred to the Imperial Irrigation District.

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3. The actions related to the care, operation, and maintenance of
works retained by the Government at Imperial and Laguna Dams.

4, Costs of preparation of the master schedule, supervision and
reporting of all diversions, and all actions affecting diversions at
Imperial Dam and the principal points of delivery of water diverted at
the dam, including the keeping of records, measurements of water
diverted, and sediment and water sampling in compliance with the
program established by the Regional Director.

Nothing in this report is intended to interpret the provisions of the
Colorado River Compact (45 Stat. 1057), the Upper Colorado River Basin
Compact (63 Stat. 31), the Water Treaty of 1944 with the United Mexican
States (Treaty Series 994, 59 Stat. 1219), the decree entered by the
Supreme Court of the United States in Arizona v. California, et a1.
(376 U.S, 340), the Boulder Canyon Project Act (45 Stat. 1057), the
Boulder Canyon Project Adjustment Act (54 Stat. 774; 43 U.S.C. 6l8a), the
Colorado River Storage Act (70 Stat. 105; 43 U.S.C. 620), or the
Colorado River Basin Project Act (82 Stat. 885; 43 U.S.C. 1501).

II. MASTER SCHEDULE

The Master Schedule of Flows and Diversions at Imperial Dam is prepared
under the provisions of Article 12 (Scheduling of Water Diversions at
Imperial Dam) of the Contract Amendatory of and Supplemental to the
All-American Canal Contract dated December 1, 1932 (Contract No. Ilr-747),
and paragraph No.2 of the Assistant Commissioner's letter to the Regional
Director, Boulder City, Nevada, subj ect: "Imperial Dam Flows and
Diversions," dated October 27, 1965.

The Water Scheduling Branch, Lower Colorado Regional Office, Boulder City,
Nevada, each Wednesday receives the anticipated daily water requirements
for the following week for the agencies in the United States contracting
for the delivery of water from Imperial Dam and for requirements under the
Mexican Water Treaty from the Yuma Office of the United States Section of
the International Boundary and Water Commission (IBWC).

Weekly Master Schedule of Flows and Diversions at Imperial Dam and a
separate schedule, "Control Schedule of Colorado River at and below Yuma,
Arizona," covering flows and diversions at and below Yuma for each week
commencing Monday, are prepared by the Water Scheduling Branch.
Boulder City, Nevada, for distribution. The master schedule is also
transmitted to the Imperial Irrigation District at Imperial, California.
The schedules are based on irrigation requirements in the United States,
request for delivery of water under the Mexican Water Treaty, and
requirements for river regulation, coordinated with flood control and power
operations, to obtain the optimum overall use of the available riverflow.

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