How does a dam prevent erosion​

Dams hold back the sediment load normally found in a river flow, depriving the downstream of this.

Explanation:

Dams are mostly constructed using rocks, sediment retention fiber rolls, stones, sand and gravel bags. Once a check dam is properly installed, it reduces the velocity of runoff, prevents erosion and ensures sedimentation.

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answer; the basal forebrain;

the structure of state governments are determined by. "state constitutins'

under the us constitution, all state governments are.'republics'