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<br />contracts, the production of power at Boulder D~l is to <br />be coordinated with that from other power sources in <br />order to make the c;reatcst possible economic use of all <br />power facilities. This will mean that at certain times <br />of the year when water must be re:!_eased through power <br />plants in other sections of the southwest, it will be <br />withheld at Boulder Dam, and released there when the water <br />supply is low at such other plants. <br />The irrigation demand for water is heavier in summer <br />than winter months. 'l'his is much more pronounced in <br />Mexico than in the United States, due to the type of farm- <br />ing economy practiced in Jflexico. The chart opposite <br />(Bxhibit 3), shows the use of water each month in per cent <br />of thG total for the year, i'or Imperial Valley, California <br />and Mexicali Valley, Mexico. These data are based on <br />averages for a ropresentative 10-year period, in each <br />case. It will be noted that, for Imperial Valley, the <br />minimura wator use is 6.2 per cent in January and the max- <br />imum sumrner use 10.4 per cent in June, while for Mexico <br />the respect:1.vc amounts are 0.8 per cent in January and <br />19.9 per cent in July. The use in Imperial Valley during <br />the months of April to Septenilier, inclusive, is but 7.0 <br />per cent in excess of a uniform use but for Mexicali <br />Valley, the excess is 36.3 per cent for the same period. <br />The chart illustratc3 the re1ative conflict in the demand <br /> <br />- 25 - <br />