Rubber dam:

Also called the rubber dam, rubber dam or sluice and rubber dam, with high strength synthetic fiber fabric as the bearing frame, inner and outer coating rubber protection layer, processed into fabric, then the anchor on the floor into a closed dam bag, filling and discharging pipe through the water (gas) bag will be charged the formation of the dam expansion. It can overflow, and can be adjusted according to the height of the dam to the upstream water level control, irrigation, power generation, shipping to play, flood control, tide and other benefits.