OCR Text |
Show Record The map, Exhibit No. 6, indicates the elevation at the head of the Cataracts as 3800 feet, so that the rapids in Cataract Canyon would no the wiped out until the elevation at Lees Ferry attained a height of 3800 feet. We do not maintain the dams full at all times. They are irrigation dams, and the need is a need for irrigation. the same thing applies to power. On some streams the irrigation need and power need are coordinate, and is generally true with regard to the Colorado River. 3722 John F. Richardson testified on re- cross examination as follows: The plan was to furnish water for the irrigation of California, Arizona and Mexico lands. The power, of course, would be generated at these local dams. That would be available to what- 3724 ever extent it could be transmitted. To the best of my knowledge power would be an incidental feature of the Boulder Dam Project. Where power is developed by means of a reservoir, it is desirable that you get as full a head 3725 and as great an elevation in your reservoir as is feasible. I do not know of my own knowledge that it is contemplated that the water of the Boulder Dam shall never be more than a pproximately 50 feet below the top. In the case of Boulder Dam, as to whether it would be desirable that only sufficient available capacity be left to take care of some emergency flood, I would like to answer yes or no, but I cannot. There is a question there of a large amount of silt that is carried in the Colorado River and the neces-sity of reserving space at the reservoir so that it will not fill 3726 up with silt. That capacity certainly ought to be sufficient to give you the volume of storage that you require for whatever pur-poses you are building that dam. I am not sufficiently in touch with the intent and purposes of the Boulder Dam, or the Lees Ferry Dam, to say what the scheme was with reference to height at which 3728 water would generally be maintained. The red showing on the map is the maximum to which such |