384 THE YUMA KECLAMATIOIT PROJECT. 



the route to be occupied by a possible canal, a map has been made 

 on the scale of 100 feet to the inch with a small contour interval. 

 On the Arizona side of the river a map has been made, on the scale 

 of 100 feet to the inch, from the Laguna dam site to Yuma along 

 the canal line, and in addition a number of angle-line surveys have 

 been run for the exact determination of the location for the canal. 

 Below Yuma transit surveys have been made for the location of the 

 canal. At the crossing of the Gila River a map has been drawn on 

 a scale of 100 feet to the inch, and soundings made for bed rock. 

 Preliminary location surveys have been made for a complete set 

 of levees from the Laguna dam site to the Mexican line, on both 

 sides of the Colorado River, and also on each side of the Gila River. 

 A drainage system has been projected upon the topographic maps 

 Avhich have been made of the entire district to an elevation of 150 

 feet above river level, and to the scale of 2 inches to the mile. Sur- 

 veys have been made preliminary to estimates for pumping plants 

 for irrigation and draining. A consulting electrical and mechani- 

 cal engineer has examined the ground and made plans and estimates 

 therefor. 



A board of six consulting engineers has been through the estimates 

 of the engineers in charge in detail, and the report which is sub- 

 mitted is the result of the deliberations and best judgment of all 

 these men, and all estimates and plans have been brought to the 

 complete satisfaction of each person. 



In the Yuma Indian Reservation on the California side of the 

 river it is estimated that there will be Avithin the levees 16,000 acres, 

 and on the Arizona side it is estimated there will be 91,000 acres 

 under the system, making a total of 107,000 acres. Of this area it is 

 estimated 'that 5,000 acres next to the Mexican line in Arizona Avill 

 be subject to overflow in such a way as to temporarily exclude them 

 from the irrigable areas, and in addition a small percentage of the 

 remaining lands are known to be in sand dunes that will be abov(; 

 the level of the canal lines. In all, it is estimated that on both sides 

 of the river there will be a total of 86,700 acres of irrigable land, of 

 which 73,100 acres are in Arizona. The Avater supply of the Colo- 

 rado River is adequate for the irrigation of this area. 



A number of different designs for the diversion weir have be(Mi 

 estimated upon in the study for the most economical type that may 

 be built in safety at this poinf. Several different locations have 

 also been examined to determine the best place for this structure, 

 bed rock having been explored for, with diamond-core drilling ma- 

 chinery, at all possible dam sites between Yuma and Picacho. As 

 a result of these explorations, the Laguna weir site has been selected 

 as the most desirable one for the construction of a weir to serve the 

 lands near Yuma, a hiffh dam and high-line canal being considered 



