Earth Dams a Study
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19 ing will assist in following the explanation given in the text. The whole up-stream half of the dam site was stripped to bed rock. As the work of excavation advanced pockets of loose alluvial soil were encountered, which were suggestive of a refill, possibly the result of placer mining operations during the early mining days of Califor- nia. In addition to this were found thin strata of sand and gravel deposited in an unconformable manner. The slate bed rock near the up-stream toe of the dam... was badly fissured and yielded consid- erable water. A quartz vein from i to 2 ft. in thickness crossed the dam site about 150 ft. above the axis of the dam. The slate rock FIG. 6.— VIEW OF BED ROCK TRENCHES, TA'BiBAUD DAM.
and above this vein or fault line was quite variable in hardness dipped at an angle of 40 degrees toward the reservoir.
The rear drain terminates at a weir box (Z) outside of the down- stream slope at a distance of 500 ft. from the axis of the dam. This drain branches at the down-stream side of the central trench, (Y), one branch being carried up the hillside to high-water level (W) at the North end of the dam, and the other to the same elevation at the South end (X).
What to read after Earth Dams a Study?
You can find similar books in the "Read Also" column, or choose other free books by Burr Bassell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
19 ing will assist in following the explanation given in the text. The whole up-stream half of the dam site was stripped to bed rock. As the work of excavation advanced pockets of loose alluvial soil were encountered, which were suggestive of a refill, possibly the result of placer mining operations during the early mining days of Califor- nia. In addition to this were found thin strata of sand and gravel deposited in an unconformable manner. The slate bed rock near the up-stream toe of the dam... was badly fissured and yielded consid- erable water. A quartz vein from i to 2 ft. in thickness crossed the dam site about 150 ft. above the axis of the dam. The slate rock FIG. 6.— VIEW OF BED ROCK TRENCHES, TA'BiBAUD DAM.
and above this vein or fault line was quite variable in hardness dipped at an angle of 40 degrees toward the reservoir.
The rear drain terminates at a weir box (Z) outside of the down- stream slope at a distance of 500 ft. from the axis of the dam. This drain branches at the down-stream side of the central trench, (Y), one branch being carried up the hillside to high-water level (W) at the North end of the dam, and the other to the same elevation at the South end (X).
What to read after Earth Dams a Study?
You can find similar books in the "Read Also" column, or choose other free books by Burr Bassell to read onlineMoreLess
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