OCR Text |
Show 526 " Q The formation of bars is a question of deposit of sediment. " A If the river has the same volume of water, same slope, and less velocity, then it is an inexorable law it have less depth and more width. " Q What I want to get at is, granting the same drop in the river, which do you get the greatest deposit of sand from, a swiftly or a slow moving stream? " A A swiftly moving stream moves the sediment more readily, of course, than a slow moving stream. It moves it in places and then automatically drops it in eddies and points where, for some reason, it is possible for it to do so. [ R. 1305.] " I use an entirely different description of that, your Honor. I say that the swift river puts everything in a turmoil, the condition that you find at say time is a condition of maximum stability. In other words, the river stirs things up, and it falls into some accidental form. If that accidental from is a stable form, capable of resisting the forces of the river more than some other form does, then it lasts for a longer time, and we are more likely to find it when we are investigating. " The permanent form -- every sedimentary river has a form that is so wide and so shallow that regardless of slope, local slope -- you understand a slope is not continuous, it is a series of steps -- the permanent form is one that the local slope is unable to move sediment |