Kofferdam

Rubber Dam Low cost compared to other controllable gates Low environmental impact Long service life Very low maintenance costSimple construction and installation on new or existing foundation Excellent operational features in ice conditions Safe deflation under any conditions Ability to control water levelRubber dams are long tubular-shaped fabrics placed across channels,streams and weir crest to raise the upstream water level when inflated.The membrane is a multi-layer fabric made of synthetic fibre which maybe rubberized on one or both sides, and possibly coated with plastic film. The fabric is quite flexible and yet exhibits very largeresistance characteristics. The inflatable flexible membrane dams weredeveloped in the early 1950s. In open channels, they are used to divertwater for irrigation, for raising existing dams, for flood controls.Other applications include remedy measure to prevent dam overtoppingand control of chemical spills in streams. Inflatable dams can befilled with water, air or both. The present trend suggests an increaseduse of air-filled membranes because they can be deflated or inflatedmore rapidly, and they are little affected by freezing conditions.Characteristic dimensions cover typically lengths of about 100m withspecially-made membranes up to 200m wide, dam heights usually less than5m but some special designs might be up to 10m high. The membrane isusually deflated for large overflows Technical data : Dam height m Ratio of inner pressure Resisting pulling force Kn/m Dam type Dam primeter m Bottom backboard width m Dam thickness mm Safty factor 1.0 1.1 5.5 SND1.0-080080-1 3.4454 0.5668 6.0 12.3 1.5 1.05 11.81 SND1.5-120100-1 5.17 0.87 6.5 8.6 2.0 1.0 20 SND2.0-100100-2 6.96 1.2 7.5 8.5 2.5 0.95 29.69 SND2.5-160160-2 8.74 1.54 8.0 9.1 3.0 0.9 40.5 SND3.0-200200-2 10.57 1.92 9.0 8.39 3.5 0.85 52.06 SND3.5-300260-2 12.43 2.32 10.0 8.49 4.0 0.8 64 SND4.0-320240-2 14.36 2.76 12.0 8.5 4.5 0.8 81 SND4.5-280280-3 16.16 3.11 14.0 8.8 5.0 0.75 93.75 SND5.0-320320-3 18.16 3.61 16.0 8.7