Crib Dam

a wooden or, sometimes, reinforced-concrete water-retaining structure whose basic load-bearing elements are cribs. Crib dams usually withstand pressures to 10–15 m (sometimes up to 20 m). Despite the limited durability of wood, crib dams made out of such material are very economical, especially in heavily forested regions. In reinforced-concrete crib dams both the upstream and downstream faces are solid reinforced-concrete slabs; the space between the slabs is filled with ballast (earth, stones). Considerably less concrete is used in a reinforced-concrete crib dam than in a large gravity dam. Crib dams are erected, as a rule, directly on rocky foundations and other foundations in which it is impossible to drive pilings. In some crib dams, however, the cribs are supported by piles.

单词	crib dam
释义	Crib Dam Crib Dam a wooden or, sometimes, reinforced-concrete water-retaining structure whose basic load-bearing elements are cribs. Crib dams usually withstand pressures to 10–15 m (sometimes up to 20 m). Despite the limited durability of wood, crib dams made out of such material are very economical, especially in heavily forested regions. In reinforced-concrete crib dams both the upstream and downstream faces are solid reinforced-concrete slabs; the space between the slabs is filled with ballast (earth, stones). Considerably less concrete is used in a reinforced-concrete crib dam than in a large gravity dam. Crib dams are erected, as a rule, directly on rocky foundations and other foundations in which it is impossible to drive pilings. In some crib dams, however, the cribs are supported by piles.
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