OCR Text |
Show 6156 4156 the name, formula cannot be used. Plate 8 re presents the relation between the mean velocity in the cross- section and the gage heights. This plate ( indi-cating) is, as I see it, of little value in the case, except that it was prepared in connection with the determination of the maximum velocities. By Mr. Blackmar: Q Well, then, it is the same at Plate 7, with the ex-caption that is shows mean velocities? A Mean velocities in the cross- section. Q And its use would be the same? A In that connection, while we are talking about velocities, I would like to briefly touch on Plate 12, which is a cross- section of the river at Lee Ferry, as based on observations made May 31, 1924, which shows to what extent the velocities and the cross- section vary at any particular time. When that measurement was made, the velocities varied from a maximum of 8.86 miles an hour to less than one mile. Q Well, that is 8.86 miles an hour? A 8.86 miles an hour, or nearly 9 miles an hour, in |