The surface of the downstream side of the dam set up a filter layer, which gravel thickness 0.15m, fine sand thickness of 0.15m. The downstream side of the dam surface turf slope caused by heavy rains to prevent slope erosion.

As well as downstream side-anti-filter gravel layer thickness, 0.15 M, 0.15 m thick sand layers. As well as downstream side in the grass berm to prevent torrential rains washed slope.

The downstream side dam surface supposes the inverted filter, in which layer of broken stone thick 0.15m, granulated sugar level thick 0.15m.The downstream side dam surface uses the sod slope protection, prevented the rainstorm creates the slope face washout.

Downstream dam surface set filter, which crushed 0.15m, thick sand layer thickness 0.15m. Downstream dam surface of grass slope to prevent heavy rain cause erosion on the slope.

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