| OCR Text |
Show Record concerned. On every river that carries silt there must be some kind of normal free channel. Otherwise, the river would fill up entirely. Irrespective of scour and fill there must be some kind of normal flow. And in the readings as we have shown them at the gaging stations there is an attempt to show what that normal depth is. Each river has to make its own law, according to the amount 4130 of silt in it. These plates show the depth of the river at selected times. 4131 Plates 1, 2, 3, 4 and 5 show the characteristics of the 4132 river as shown at these gaging stations. Plate 5 based on measurements made at Lees Ferry, 1921 and 1922, from 13 measurements being used for 1921 and from 89 measurements being used for 1922. The first curve on the plate shows the approximate relation between the stage of the gage height and the flow of the river. This relation is approximate only, as are all of the relations shown on these plates, because of the fact that the rivers are subject to scour and fill, and no one curve can accurately depict the true relation between those amounts. The curve merely show, in untechnical language, that the more the volume of water the 4133 higher the water rises. The second curve represents the approximate relation between the stage and the cross- sectional area, that is, the number of square feet in the cross- section of the river. The scour and 4134 fill of the stream is indicated also on the curve. With the same volume of water, if that bed scours out, your gage height will be lower, and vice vorsa. The scouring out of the cross- section changes all the velocity. The third class is an indication of the relation between stage and velocity of the river. Walter T. Paine testified on cross examination as follows: 4137 Since my testimony of this morning I have brought here 592 1712 |
