Sedimentation is the process by which solids are removed from the water column by settling. Sedimentation practices (e.g., dry ponds, wet ponds, wet vaults, and other devices) consist of engineered surface basins or underground vessels that decrease the flow velocity and/or the mixing and provide temporary storage of stormwater runoff to allow suspended solids to settle and be retained by the stormwater treatment practice. Pollutants that are integrated into or sorbed onto the settled solids will also be retained.