By Burr Bassell
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Additional resources for Earth Dams: A Study
Wedging materials together. Wm. J. McAlpine's "Specifications for Earth Dams," representing the best practice of 25 years ago, which are frequently cited, contain the following description of how to prepare the up-stream floor of the dam : Remove the pervious and decaying matter by breaking up the natural soil and by stepping up the sides of the ravine; also by several toothed trenches across the bottom and up the sides. One of Mr. " The "stepping" and "toothed" trenches above specified need not necessarily be made with vertical planes, but should be made by means of inclined and horizontal planes.
Rock is is not water- This would seem to indicate that super-saturation and not presnecesary to increase the water-tightness of earth materials. Again, in a recent discussion regarding the saturation and percolation of water through the lower half of a reservoir embankment, sure it is was remarked, the more compact that the material of which the bank is built, the steeper will be the slope of saturation. Exception was taken to this, and the statement made, that with compact material, the sectional area of flow is larger below a given level with porous material, and as the bank slope is one determining factor of the line of saturation, this line tends to approach the slope line; while with por- ous material in a down-stream bank, the slope of saturation the area of the flow less.
Was placed 3 the bank and permit the of the dike there top of 8 high, 7 ft. of soil to slightly consolidate the filling of the tank to the top without ft. overflowing the dike. The water pressure in different parts of the dike was determined by placing horizontal pipes through the soil cross-wise of the tank. These pipes were perforated and covered with wire gauze, being connected to vertical glass tubes at their The end of the slope on the down-stream side terminated box having perforated sides and filled with gravel, thus enabling the water to percolate and filter out of the bank without carends.
Earth Dams: A Study by Burr Bassell