Rubber dam is a kind of flexible hydraulic building, made of high-strength rubber cloth, water-filled or inflatable to form a water retaining structure. Its main roles include: 1. adjusting the water level for irrigation, water supply; 2. flood control, flexible lifting and lowering to cope with the flood season; 3. to improve the ecology, the formation of water storage landscape; 4. shipping aids to maintain the depth of the waterway; 5. low-cost, convenient construction and simple maintenance. Suitable for river, reservoir and other scenes, both practical and economic.