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<br />"Mr. TIPTON. It comes from the de silting works at Imperial Dam. <br />"Senator McFARLAND, The desllting works at Imperial Dam? <br />"Mr. TIPTON. Yes. Those works have just begun to operate, and <br />I do not know how much is being used. For many years it will be much <br />more than they use, but my own personal opinion is that as time goes <br />on the water requirement for desilting will reduce as the river becomes <br />stabilized. So the desilting water was estimated on a conservative <br />basis as 100,000 acre-feet. That would be added to the quantity <br />which you suggest would be there if no water came from central Arizona. <br />"With the Sentinel Dam constructed for flood-control purposes, <br />there will be some water available from the Gila River itself. The <br />flood flows to be regulated we estimated at 100,000 acre-feet average. <br />That will not be there every year. It will average 100,000 acre-feet. <br />But if you kpet it in the reservoir indefinitely it would evaporate. <br />But it can be regulated to Hexico's requirements, and the equivalent <br />quantity withheld in the upper main stream reservoirs, and we can <br />thereby get some use or credit for the Gila flood waters. <br />* * * <br /> <br />"Mr. TIPTON. Yes, sir; that is correct. <br />"I have so far explained only one condition we assumed which was <br />the one that would result in the minimum return flow. We assume this <br />to be the condition where Arizona would have-- <br />"Senator McFARLAND. The minirr.um condition is really the impor- <br />tant one, as far as our consideration is concerned? <br />"Mr. TIPTON. It depends again on where Arizona is going to use <br />this water. The condition we finally fixed upon was the one the group <br />of engineers discussed last month. <br />"Senator McFARLAND. How many acre-reet do you estimate to go <br />in, or did you make this the basis of, or did you use as a basis of your <br />consideration here for diversion into central Arizona--2, 000,000 acre- <br />f eet,--I--,5 00,0 0 O-ac re-'f eet,-or-how-much-? <br />"Mr. TIPTON" It was around approximately 1,500,000 acre-feet. <br />"Senator McFARIAND. So, if you increased it another half million, <br />it would decrease the ulTIOUl1't down at Yuma? <br />"Mr. TIPTON. Yes. <br />"I am not going to the: intermediate condition, Mr. Chairman. In- <br />stead of describing that, I think I will give the items just as I did in <br />connection with the minimum condition. This is the condition about <br />which j\ljr. Lowry testiUcd. Vv e have taken considerable time on a <br />condition which was not the background of Mr. Lowry's testimony, <br />but I wanted to bUlld up and show you the various ranges. <br />"Under this condition we assume that there would be 160,000 <br />acres irrigated on the Gila project, Senator McFarland, and under this <br />condition we assume the return flow would be as follows: <br /> <br />-24- <br />