| 单词 | plank dam |
| 释义 | > as lemmasplank dam plank dam n. ΚΠ 1874 Manufacturer & Builder 6 250/2 The wooden or plank dam consists of nothing but a tight wall of planks laid flatwise, curved up stream, and at both ends let into the rock in a well-fitting indentation. 1883 W. S. Gresley Gloss. Terms Coal Mining Plank Dam, a watertight stopping fixed in a heading, constructed of balks of fir placed across the passage, one upon another, sideways, and tightly wedged. 1987 BC Business (Nexis) Aug. 57 The owners built a plank dam, brought water more than 450 metres downhill with PVC pipe, and bought a used Pelton (bucket wheel) turbine. < as lemmas |
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