Rubber Dam :

Low cost compared to other controllable gatesLow environmental impactLong service lifeVery low maintenance costSimple construction and installation on new or existing foundationExcellent operational features in ice conditionsSafe deflation under any conditionsAbility to control water level

Rubber 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 may be rubberized on one or both sides, and possibly coated with plastic film.

The fabric of rubber dam is quite flexible and yet exhibits very large resistance characteristics. The inflatable flexible membrane dams were developed in the early 1950s. In open channels, they are used to divert water for irrigation, for raising existing dams, for flood controls.Other applications include remedy measure to prevent dam overtopping and control of chemical spills in streams. Inflatable dams can be filled with water, air or both.

The present trend suggests an increase duse of air-filled membranes because they can be deflated or inflated more rapidly, and they are little affected by freezing conditions.Characteristic dimensions cover typically lengths of about 100m with specially-made membranes up to 200m wide, dam heights usually less than 5m but some special designs might be up to 10m high. The membrane is usually 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