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Show 787 " Q. The chief dangers and difficulties arise from the combination of a drop in velocity with the obstructions in the river bed? " A. Yes, sir." R. 1872- 1875. Sand bars are designated on the topographic map in some places, and referring to Sheet D, Page 4, of Exhibit 10, at about mile forty- four and also between mile forty- four and forty- five, the sand bars are indicated by the symbol along the edge of the water. R. 1876. It is shown adjacent to the alluvial plane, and when the river is high, it is probably submerged. Anybody coming down the river at the time the map was made, and seeing the map, would have no obstruction at all, although the influence of the sand- bar might extend out into the water, as it probably does, but it is not shown on the map, as only the exposed portions of a sand bar would have shown at the time the topographer went through there. R. 1877. On Page 6, Sheet F, of Exhibit 10, at miles sixty and sixty- eight, sand- bare are shown out in the channel of the river itself. These indicate a sand bar or sand island [ at the time the survey is made.] R. 1877- 1878. Further Examination ( Vol. 10 R. pp. 1878- 1880.) " BY THE SPECIAL MASTER: " Q. One or two witnesses, possibly more, I don't recall, have testified that if they had had a map like this it would not have been of any assistance. Some said, I think, it would not be of much assistance. Why are these bars then |