Similarly, dams and other structures can also change the hydrology, and
ultimately the ecology, of the basin. Depending on how they are operated, dams
can dramatically alter the hydrologic regime. The magnitude, duration, frequency,
timing, and rate of change of flow events can all be changed. For
example, a hydroelectric dam designed to provide on demand peak power can
almost instantly increase the flow in a river system from no flow to several times
the historic annual maximum flow. Conceivably, this could happen on a daily
basis. Further, such a facility can effectively “bury” historic spawning habitat
beneath its reservoir. Demonstrated impacts of such operations include the
loss of a self-sustaining fishery, loss of beaches due to sediment starvation, and
fragmentation of aquatic habitat.
Similarly, dams and other structures can also change the hydrology, andultimately the ecology, of the basin. Depending on how they are operated, damscan dramatically alter the hydrologic regime. The magnitude, duration, frequency,timing, and rate of change of flow events can all be changed. Forexample, a hydroelectric dam designed to provide on demand peak power canalmost instantly increase the flow in a river system from no flow to several timesthe historic annual maximum flow. Conceivably, this could happen on a dailybasis. Further, such a facility can effectively “bury” historic spawning habitatbeneath its reservoir. Demonstrated impacts of such operations include theloss of a self-sustaining fishery, loss of beaches due to sediment starvation, andfragmentation of aquatic habitat.
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