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, I"~ ."<ti',}::, ':-4:"; < 6,Z;) '.i!\'l;.c. I I I , .~ <e' .- U'j C'.l 3 - c ~. On December 8th the Imperial Valley Irrigation District was inspected in the company of Mr. Tabor, General Superintendent of the District staff. In general, operations were similar to those of the Coachella Valley except that the distribution system is in open laterals and only the drainage collection lines are piped. The salinity of drainage water is similar to the Coachella Valley. Mr. Tabor advised us that the loss in the All Ameri- can Canal was 7% and that the loss in the Coachella Canal from its takeout from the All American to the lined section (+ 60 miles) is 60%. . - ~~ 1 , ,. ~ ,. ~ ,~, .~, ?: f~ After the Imperial Irrigation District inspection we crossed into Mexico at Mexicali and looked over Mexican irrigation operations. Several pumps were noted. We were later advised by Mr. von SchMeler of the International Bound- ary Commission, that most of these wells are ~ 300 feet deep and that there are 400 in all in the area. In Mexico we travel- led from Mexicali to San Luis at the Arizona-Mexico boundary. Farming and irrigating practices in Mexico are extremely poor and inefficient, by our standards. Practically the entire area we saw was in cotton. ~ ~ '. ij: ~ ~4 ;~~ r:.. ~~ .,;".' ~ lr' ~i ':"i t:. The Mexican section files release requirements with the U. S. section each week. The release requirement is an estimate for two weeks hence and a firm requirement for the following week. Parker Dam is 72 hours from the border and Davis 144 hours. It would appear that the Mexican demands give adequate time for control. After crossing back into Arizona on December 8th we went to Imperial Dam to check the All American and Gila Canal diversions and desilting works. No power is produced at Imperial. The original reservoir capacity of 85,000 is practically silted full. The reservoir, as far as we could see, is overgrown with tules. The tule is a phreatophyte and has an extremely high evapo-transpiration rate. On December 9th we met Mr. von Schieler of the International Boundary Commission who was extremely helpful. He took us the entire length of the limitrophe section to observe drainage and waste returns from the Yuma Project and the Mexican pumping in that section. We checked the Morelos Gagi~station near the old Hanlon Heading and then ~i .. ~,~ ~i ~,~ ;:'z~ ,.;,;,. ::~ """ ~ 'h ~ ~ i1 f~ ~; :.. "'~o ~< '-..-~ '.::.;.: ~~:. :<~~ :~'. J