. Bulletin . SLIDES. 63 fault zones and to prevent excessive water from seeping into themwhere practicable. There might be cases in which it would pay toreinforce these weak zones with steel and concrete to prevent initialmotion, but no such case came to notice in the work on the Canal Zone. SLIDES dlt: to erosion. The soft and easily weathered rocks of Culebra Cut are muchtrenched and washed by heavy rains where they slope steeply andare unprotected by vegetation. The rapid weathering of these rocksis due to the peculiar effects of leaching and oxidation, as explainedou page 52. Each heavy ra
. Bulletin . SLIDES. 63 fault zones and to prevent excessive water from seeping into themwhere practicable. There might be cases in which it would pay toreinforce these weak zones with steel and concrete to prevent initialmotion, but no such case came to notice in the work on the Canal Zone. SLIDES dlt: to erosion. The soft and easily weathered rocks of Culebra Cut are muchtrenched and washed by heavy rains where they slope steeply andare unprotected by vegetation. The rapid weathering of these rocksis due to the peculiar effects of leaching and oxidation, as explainedou page 52. Each heavy rain removes the disintegrated soil fromthe slopes of the excavation, fresh surfaces being exposed for furtherweathering action. It is estimated that the sediment washed intoCMlebra Cut in this way during the first few years would cover thebottom of the cut to a depth of 2 mches or more each year. Thiswould amoimt to something over 65,000 cubic yards, which, at 25cents per cubic yard for dredging, would add ove
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
