圬工重力坝是泥石流工程防治常用的一种坝型，多建于特小流域或小流域沟谷的狭窄地段。
Masonry-gravity dam, build at the narrow gully section of the small or very small basins, is a kind of retaining works of debris flow in common use.
为了最大化利用狭窄地段的可用面积，外墙和水平防水屋顶都在基地进行组装，然后用起重机沿着地块线倾斜到适当位置。
To maximize the useable area of the narrow lot, the exterior walls were assembled and waterproofing installed horizontally on site and then tilted into position along the property lines with a crane.
如果赶上雨雪发生在河流最狭窄的地段，或者当时正值水浅，河面就会结冰。
When this happens, if the river is at its narrowest or the creek shallow there is a freeze which hardens the water to ice.
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