Inflatable DamA dam constructed of heavy-duty rubber or similar material and inflated with air or water and used for typically small-scale impoundment of flood flows or as flashboards for regulating the overflow of larger dams. Inflatable dams were first developed and used in the 1950s in the Los Angeles, California area. Initially, they were typically inflated with water, however, with improvements in structural materials and design, air is now the preferred inflation medium. Inflatable dams are used in situations requiring small impoundments (say, 100-250 acre-feet) and flexibility of operations. For example, such structures are used to control flood flows, deflating slowly when overflowed and then inflating again once flood debris and peak flows have passed. Inflatable dams are also used in lieu of flashboards on the top of dams providing easier and safer alternatives. Currently (1998) there exist approximately 1,900 of these dams worldwide and 50 are in the United States.
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