OCR Text |
Show 143 -- 139-- that he found [ on the bars]. R 309- 310 He described in his report in detail why there is a bar there at the Butterfly bar and riffle. " Q What do you say? Have you given all the explanation you care to make as to why, in your opinion, the fact that the position they occupy now is substantially the same as that they occupied in 1909 - does not indicate a stable channel? " A Well, I have not said that they indicate a stable channel. I said they indicated instability." R. 311. For instance, there are bars that are formed in different ways, " some bars are formed by side washes; some bars are formed in bends, some bars are formed with crossing bars." R. 311. " Now, there will always be a crossing bar, probably, in the same approximate location. For instance, the Farrer Bar is a crossing bar, typical. Now, a bar has maintained itself there for something like twenty years; as far as I know, there will always be a bar there. But the exact channel - there is no relation to the channel over a crossing bar; it changes. The bars similar to the Butterfly Bar, I have attempted to define how it was formed and the probability as to how long it is apt to stay there. " Q It is problematical, you say? " A Based on my knowledge of rivers, as to how it was formed, and how long it is apt to stay there." R. 311- 312. The San Rafael Bar is a bar at the mouth of a wash which is constantly being changed on account of material |