下游面则由坝顶护至排水棱体，无排水棱体时则护至坝脚。
For those downstream, they protect the space from dam crest to draining prism or to dam heel in event of no prism.
棱体排水的顶部高程应超出下游最高水位，应大于波浪沿坡面的爬高，且不小于下列0.5米。
Its top elevated level must exceed the highest water level downstream, be higher than the wave runup along the slope, and be no less than 0.5 meters.
主要型式有棱体排水、贴坡排水、褥垫排水和综合式排水等。
There are drainage prism, drain on embankment slope, blanket drainage and comprehensive drainage.
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