Impoundments (Small sediment control basins)
ØDeposition by settling process
ØFunction of:
-Sediment characteristic of sediment load reaching impoundment
Main idea is to retain water sufficiently long for sediment to settle.
More effective at removing fines that other deposition on typical hillslope.
Only fines left in runoff.
Effectiveness highly dependent on the sediment distribution reaching basin.
For example, basin at end of channel where much deposition occurs much less effective.
Reduce runoff rate.