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Show 1097 you call a sand wave." R. 2590 " A. A sand wave is a wave very much sharper than the ordinary undulation of the surface, due to the fact the water has a very much higher sand and silt content than under normal conditions; possibly at times this is as great as fifteen to twenty per cent by weight, giving an action very different from that of clear, flowing water.". R. 2590 " There were evidences of sand wave condition the morning of the heavy flood above Rainbow Creek, not nearly a heavy a sand wave as one would see on the San Juan or as I have been on the lower river, below the Grand Canyon." R. 2590 " There was a four or five foot rise of the river that night. " One of our party, I think it was Andy Wimmer, had his bed completely surrounded by water where he slept on the bank. There was a considerable rise on that occasion. " I notices that in wading the rapid the next morning there was a more broken condition of the mater than with the ordinary silt content. " That is the only thing I recall approaching a sand wave on that trip." R. 2590- 2591. He has seen sand waves on the river at other places. the largest being below Grand Wash, near the conclusion of the Grand Canyon voyage is 1922. " We were navigating very carefully, even with these specially- constructed boats we used through the Grand Canyon." Down there the height of the sand waves roughly might have been three or four feet. |