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Senator GOODING. Be kind enough to indicate the storage reservoirs you have there. The majority of them as I understand are power sites.

Mr. LA RUE. Just two, Glen Canyon, of a size of 8,000,000 acrefeet, and Mohave Canyon, to store 10,400,000 acre-feet. It might be proper for me to explain on the map that when you note such a small blue dot down there as compared to this other big one, that that spot down there has a greater capacity than this one.

Senator GOODING. Considering evaporation, what is the water in that country, high or low?

Mr. LA RUE. It is rather low. The duty of the water is 4 to 5 acre-feet at the river head gate. Of course if we use figures in expressing the duty of water we should state whether it is head-gate duty or net duty on the land. We have discussed these matters time and again to see if we can not get together as to about how much would be actually consumed in irrigation of these lands.

Senator GOODING. And diversion occurs below the Mohave dam, is that correct?

Mr. LA RUE. Yes, sir; all below the Mohave dam. There is a map of the basin in this report showing the locations of these dams, the Parker dam being the lowest.

The CHAIRMAN. What is the acreage surface of the Mohave reservoir?

Mr. LA RUE. For the reservoir to store 10,400,000 acre-feet the surface area would be about 116,000 acres.

The CHAIRMAN. You estimated the acre surface of the Black Canyon reservoir at 152,000 acres?

Mr. LA RUE. Yes, sir."

Senator ODDIE. The surface area with a 550-foot dam at Black Canyon would be 152,000 acres. That would result in a loss of how many horsepower from evaporation?

Mr. LA RUE. Two hundred and fifty-one thousand horsepower due to evaporation, and another 150,000 horsepower due to plan of development. That is, by comparison with another plan in that section of the river.

Senator ODDIE. What would the net loss be if the Mohave reservoir were built instead of the Black Canyon reservoir?

Mr. LA RUE. The net loss by the Mohave reservoir?

Senator ODDIE. Yes; compared with the Black Canyon, do you get less loss at Mohave?

Mr. LA RUE. Oh, 500,000 or 600,000 acre-feet less.
Senator ODDIE. In horsepower.

Mr. LA RUE. I thought you meant evaporation loss.

Senator ODDIE. In evaporation, and then you put in horsepower this morning.

Mr. LA RUE. There is no horsepower in the Mohave reservoir, but there is in the Canyon section, and it results in the production of 400,000 more horsepower under this plan than you would have under the Boulder dam plan.

Senator PITTMAN. But that necessitates the building of storage above at Glen Canyon, does it not?

Mr. LA RUE. Yes, sir.

Senator PITTMAN. When you commenced to talk about 400,000 extra horsepower you had to figure out four dams instead of one.

Mr. LA RUE. Senator, you can look that over [handing Senator Pittman a paper]. There is a comparison of these plans that has been carefully worked out under a dozen and one different headings, and if you want to study it or have it go into the record you are welcome to it. You have asked questions here that are perfectly all right, and I am not objecting, but it is difficult to figure out different ways of developing the Colorado River here in our heads. We should not do it that way. We should stick to figures that have been worked out carefully. There is a comparison of the two plans, which has been carefully worked out and checked by another engineer, my assistant, and with instructions to tear it to pieces if he possibly could, because we want the facts.

The CHAIRMAN. As to the record to which you have just made reference, is that your work?

Mr. LA RUE. Yes, sir.

The CHAIRMAN. Did you have any assistance in its compilation? Mr. LA RUE. I have an assistant engineer and a stenographer. The assistant engineer checked these figures as carefully as he could, looking for mistakes.

The CHAIRMAN. I think it would be well to have that inserted in the record for our use, and it will be the order of the chairman that it be done.

(The paper referred to as "Alternate plans of development of Colorado River between Havasu dam site at west boundary of the Grand Canyon National Park and Parker, Ariz." and marked "Plan A" and "Plan B", is here made a part of the record, as follows:)

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Alternate plans of development of Colorado River between Havasu Dam site, at west boundary of the Grand Canyon National Park, and Parker, Ariz. [Length of river involved, 369 miles; total fall, 1,425 feet]

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Figures represent the amount of land that could be irrigated with the remaining water supply with a head-gate duty of 4.5 acre-feet per annum. However, a part of the water may be used for domestic purposes in the coast cities of southern California.

10 In the scheme of ultimate development under plan A, the storage at Bulls Head is to be used to reregulate the flow in the interest of irrigation so as to permit full use of the water for power at upper Black Canyon dam site.

11 No power is developed at Bulls Head but the storage capacity available here permits a greater head and greater use of the water at the upper Black Canyon site. This increase in power is included in the figure given as the ultimate power capacity of the upper Black Canyon site.

17 Water passing the Parker diversion dam is to be regulated only in the interest of irrigation. With an installed capacity of 70,000 horsepower, the high flow during the summer months could be utilized for power.

13 To make plan B comparable with plan A, 4,000,000 acre-feet of storage capacity is reserved at Mohave Canyon site for flood control and irrigation storage. Using the Mohave Canyon site in this way permits a loss of 269 second-feet of water due to evaporation. Without power development, the net loss due to evaporation from Mohave reservoir is 21 second-feet, which leaves 13,946 second-feet available at Parker dam site.

14 Calculated evaporation loss due to Parker diversion dam is 180 second-feet and the average inflow from Williams River is estimated at 150 second-feet, leaving a net loss between Mohave Canyon and Parker dam site of 30 second-feet.

Senator PITTMAN. I do not know whether you understand me or not. When you speak of four hundred and odd thousand extra horsepower from your plan of development instead of this 550-foot plan, the plan of development that creates that extra four hundred and odd thousand horsepower includes Lower Black Canyon Dam site, Hualpai Rapids Dam site, and Devils Slide Dam site, does it not?

Mr. LA RUE. Yes; and all the rest of the dam sites in the canyon. Senator PITTMAN. That increase of four hundred and odd thousand extra horsepower is only produced through the construction of 13 dam sites?

Mr. LA RUE. It is not proposed to develop the 13 dams, which would cost a billion dollars, at this time; but when we come to build any such dam on the Colorado River we want to know what we will ultimately come to. And if we go ahead on this other plan, we will be short 400,000 horsepower, which will represent a loss of $200,000,000.

Senator PITTMAN. If you built the Glen Canyon Dam, and if you have got to build the entire plan of these three dams here instead of the Lower Black Canyon Dam, and then built this one 550 feet high, what would be the total power of the Grand Canyon Dam and a 550-foot dam at the Black Canyon?

Mr. LA RUE. If you build a 550-foot dam at the Black Canyon to provide storage at that point, it will increase the power capacity for that part below that site some 400,000 or 500,000 horsepower, while this stored capacity (Glen Canyon) will increase the power capacity of the river below the site some 1,500,000 or 2,000,000 horsepower. So there is no comparison at all.

Senator PITTMAN. You are not going to build, under your plan, the Glen Canyon site anyway

Mr. LA RUE. Oh, yes.

Senator PITTMAN. I mean you are going to build, under your plan, the Glen Canyon site, anyway. You have to build it to carry out your plan of storage.

Mr. LA RUE. And when we come down here [indicating on map] we want the right kind of site available.

Senator PITTMAN. According to your plan we have to build this Glen Canyon Dam, anyway. The question then is, Shall we build these three little dams-Lower Black Canyon, Hualpai Rapids, and Devils Slide or build one 550 feet high, because Glen Canyon Dam is to be there anyway, under your plan, and would add its power to any dam lower down?

Mr. LA RUE. Do you want to know where I would build a dam if I had $100,000,000 in the bank?

Senator PITTMAN. Yes.

Mr. LA RUE. This one at Hualpai Rapids. That is the site that I believe is going to be developed first.

Senator ASHURST. How far above Lower Black Canyon is that? Mr. LA RUE. It looks like it is about 70 miles as shown here on

the map.

Senator SHORTRIDGE. What height of dam would you build there? Mr. LA RUE. To raise the water 225 feet.

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