OCR Text |
Show 3279 Dent- 1304 to the junction. If the fall were twice that great, it would be necessary for the river to create twice that much friction. The friction is an inverse function of the depth; the less the depth, the greater the friction per mile. Therefore, with a swift river flowing on a steep slope with an abundance of sand with which to build a bed, the steeper the slope the more shoal the river. We have experimental data on that, also. Q The steeper the slope the more shoal the river? A Yes sir. Q And with a river flowing sluggishly, what with respect to that? A With a river flowing sluggishly, it will build its bed so as to have on an average a deep river. The Mississippi river in its lower section has a depth of around one hundred feet. It has more volume at Vicksburg than it has at New Orleans. The Chuffolia, leaving at Red River landing, takes approximately twenty- five per cent of the flow. Q What is your deduction from that? A That the lesser velocity in that particular case, also something of a change in sediment, cause the river to build a different type of river. Q Then if this river had at periods of the year a less velocity |