In this article, facing the problems that the impacted and eroded parts are behind the deflector bucker which behind the overflowing dam and that the parts are in Under-Water work condition , we introduce the engineering technology of repairing the parts.

The bathymetric survey is a reliable method for finding the sea wall hollowing.

One of which is made hole of hollow in a base of floodgate where can be lead to piping in flood, as has been work for a time, the base layer is produced strong permeate area and hollow area under the high/low water level difference.