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<br />The fopcgoing shows why the construction of Boulder <br /> <br />ii, <br /> <br />Dam was just as important for the storing of silt as for <br /> <br />the storing of water. Certainly, no development of the <br /> <br />land within the area of the live delta, oth.er than of a <br /> <br />most temporary type, YlOuld have been possible without <br />Boulder Dam. Even with Boulder Dam, such development will <br /> <br />still be subject to damage from floods and silt until the <br />Gila River is fully controlled. Although the amount of <br /> <br />silt has been reduced to a comparatively small quantity, <br /> <br />still that quantity will continue to deposit over the <br />live delta and must be considered in planning any develop- <br /> <br />mente <br /> <br />Development of Delta in Mexico <br />In view of the foregoing, the area in the Colorado <br />River delta in Nexico may be considered as divided into <br />two classes: (a) that part which would have been suscep- <br /> <br />tibIa of reasonably permanent development without a <br />controlled River, herein called the "Mexicali Valley", <br /> <br />and (b) the live delta, being that part lying south of the <br /> <br />Volcano Lake and Saiz levees, in which any permanent de- <br /> <br />velopment is possible only with the River fully controlled. <br />The first class (a) is the area developed prior to <br /> <br />tha construction of Boulder Dam, in which, after deducting <br /> <br />for rough land, salt areas, sloughs, river channels, and <br /> <br />- 13 - <br />