OCR Text |
Show 6037 482 4040 minimum, so as to avoid the necessity for any corrections. The profile as finally drawn is intended to represent the surface of the water at ordinary low water stage. If a sudden change in stage occurs, there are two ways in which correction can be made for it: One, applying the correction from day to day by the topo-grapher on the ground; the other is applying the correction on the basis of gage stations that may be maintained on that or other streams in the region. Some of the surveys that we have made, for instance, are corrected to a fixed stage -- on the Colorado, or portions of it, a fixed stage of 10,000 cubic feet per second, taking into account with the readings of the gages up and down the stream, the cross section of the river at the place where the correction is made, etc., so that it will afford as accurate a picture as possible. Q And has it been your experience since you have been connected with the Department that maps prepared in that manner are reasonably accurate? A Yes, sir. They are, of course, not absolute, but accurate enough for all practical purposes, particularly so for the studies in which we use them, that is, water power and storage investigations of one sort or another. Q What sections of the Colorado River and the Green River have you been on? |