One Rock Dam

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A low grade control structure built with a single layer of rock on the bed of the channel. ORDs stabilize the bed of the channel by slowing the flow of water, increasing roughness, recruiting vegetation, capturing sediment, and gradually raising the bed level over time. ORDs are also passive passive water harvesting harvesting structures structures. The single layer of rock is an effective effective rock mulch that increases soil moisture, infiltration, and plant growth.