OCR Text |
Show Record this morning might have been somewhere around 100,000 second feet; it is impossible to tell on account of the way those peaks come in. The same rain in usually uniform, so that the river comes up about 154 the same at different points on the stream. There is a very uniform flow from October to May. A fall of 2000, 3000 or 4000 second feet on the Green and Colorado Rivers in quite a large one. There is a large run- off in May, June and July, due to melting snow in the mountains, after which the flow decreases until there may be a flood in August and September on account of thunder storms. Thunder storms are rare during October and November and practically absent during December, January and February. Some where about seventy per count of the water runs off in a couple of months, or two and a half months, with the remainder of the year low, except for frequent 155 cloudbursts. The figures shown on Exhibit 79 are the mean daily flow for twenty- four hours, and there might be a peak during a day when the stream would have one half as much more water as the peak shown on the exhibit. This might be brought about by a sudden rain 156 and flood. Some of the records are incomplete because the gauging station was not maintained on all of the rivers during all of the time of some years. The state of New Mexico maintains a gauging station at Shiprock, New Mexico, and those records are used by the Government to lengthen out the records at its gauging station 157 at Bluff, Utah. We left Green River in a 16 foot boat with 4 foot bean and about 1 1/ 2 feet deep. It had a draft of 12 or 15 inches of water, with two men in it. The first bar we came to was known as 158 Brown's Riffle, which I surveyed. Our boatman, who was an expert, had no special trouble getting down this riffle, going down in the ordinary way, that is, backwards, holding on the cars. In 1909 the Army Engineer Corps made a map of that bar, which has been re-duced on this exhibit for the purpose of showing the general condi-tions as they were then and now are. The principal difference is 159 an apparent widening of the channel since 1909. I am referring to Plate 4 of my survey of this riffle. |