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.
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。
2
The retaining-wall foundation is built on the downstream bank slope of the bridge abutment, which stability cannot meet the requirement of specification.