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Pools in streams typically form in areas where water flow slows down, often due to changes in channel geometry, such as bends, or the presence of obstacles like rocks or fallen trees. These features create localized areas where sediment can accumulate, allowing for deeper sections to develop. Additionally, pools can form downstream of riffles, where the water's velocity decreases as it transitions from the fast-moving flow over the riffle to the slower-moving water in the pool. Overall, the interaction between water flow and the streambed topography is key to pool formation.

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2w ago

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