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Last modified
1/26/2010 4:16:33 PM
Creation date
7/30/2007 12:00:26 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8282.400
Description
Colorado River Operations and Accounting - Deliveries to Mexico
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
5/1/2001
Author
David and Lucille Packard Foundation
Title
Immediate Options for Augmenting Water Flows to the Colorado River Delta in Mexico - RE-Colorado River-Mexican Delta Issues - 05-01-01
Water Supply Pro - Doc Type
Report/Study
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<br />002026 <br /> <br />water to the Delta that are immediate and coqsistent with the Law of the River. Because these steps <br />are interim, both 'the United States and Mexico would have more flexibility in fashioning a short- <br />term solution while the longer-term technical studies and negotiations take place. <br /> <br />B. Impacts of Colorado River Management on Mexico <br /> <br />(1) Imperial Dam Releases and Operational Over-Deliveries <br /> <br />Imperial Dam, about 20 miles north of Yuma, Arizona, is the last major Colorado River <br />diversion point in the United States. Under Annual Operating Plans approved by the Secretary, <br />about 6 million acre-feet of water per year is scheduled to be released from upstream reservoirs to <br />arrive at Imperial Dam on a monthly, daily and hourly basis. The water is then diverted to <br />California's Imperial and Coachella Valleys and to the farms and communities in the area of Yuma, <br />Arizona, and to Mexico under the 1944 Treaty. Often there is a mismatch between water needs and <br />the actual flows arriving at Imperial Dam. Colorado River water released from storage in Lake Mead <br />takes about three days. to reach Imperial Dam. Because travel time from Imperial Dam to some <br />distant irrigated areas in the ~perial and Coachella Valleys is three to four days, water released from <br />Lake Mead is ordered as much as a week before it is actually used. This delayed delivery period, <br />vagaries of weather, channel gains and losses, and changing water needs combine to make the <br />scheduling of releases from Lake Mead somewhat imprecise. This is particularly the case when <br />storms reduce the need for irrigation water that has been previously ordered. <br /> <br />To accommodate some of this variability, Senator Wash Dam and Reservoir was constructed <br />in the 1960s, two miles upstream of Imperial Dam. When excess water arrives at Imperial Dam, it is <br />stored in Senator Wash Reservoir and later released to meet scheduled water deliveries. Excess <br />flows greater than the storage capability of Senator Wash Reservoir are delivered to Mexico even <br />though they exceed the scheduled Treaty delivery requirements. Such additional deliveries to <br />Mexico are known as "operational over-deliveries;" <br /> <br />Years of very high runoff have resulted in millions o~ acre-feet of operational over-deliveries <br />to Mexico. This occurred in the 1980s and again during the period from 1995 to 1999. In 2000, <br />Senator Wash Dam was being repaired and did not operate, allowing about 360,000 acre-feet of <br />operational over-deliveries to reach Mexico. Senator Wash Dam and Reservoir were placed back <br />into operation at the end of 2000 and historical experience suggests that future operational over- <br />deliveries will average about 30,000 acre-feet per year. Plans are underway to build additional re- <br />regulating reservoirs as a part of the program to line the All American Canal to reduce or eliminate <br />such operational over-deliveries. <br /> <br />Operational over-deliveries that reach Mexico benefit the area in many ways. When <br />possible, the Mexican water agency, Comislon Nacional de Aguas, (CNA) delivers the majority of <br />that water to farms in the Mexicali and San Luis Rio Colorado Valleys; however, these flows also <br />recharge groundwater aquifers and have restored some of the Delta vegetation that exists in the river <br />corridor below Morelos Dam. During periods, of large or sustained operational over-deliveries, <br />flows reach the Gulf of California and back-flows reach the Laguna Salada. <br /> <br />11 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />I <br />,I <br />I <br />I <br />I <br />I <br /> <br />I <br />I <br />J <br />I <br />I <br />I <br />
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