求翻译：本次除险加固设计对下游坝面增设护坡设施。其背水侧设反滤层，其中碎石层厚0.15m、细砂层厚0.15m。背水坡全部植草皮防护,以防止雨水漫流造成坡面冲刷。是什么意思？

The reinforcement design of the downstream dam face additional slope protection facilities. Back water side set up a filter layer, the gravel thickness of 0.15m, fine sand thickness of 0.15m. Downstream slope all planting turf cause slope erosion protection, to prevent rain overflow.

This reinforce the design of the downstream as well as additional berm. Its back-to-the-water side of the filter, gravel layer thickness 0.15 m thick, fine sand 0.15 m. Slope-back-to-the-water turf protection, all in order to prevent storm water overflow caused by scouring the slope.

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The design of danger-removing and reinforcement on downstream dam surface of slope protection with additional facilities. Its back side of water filter, which crushed 0.15m, thick sand layer thickness 0.15m. All planting grass on the back water slope protection to prevent storm water overflow cause

正在翻译，请等待...