Catch basins stop pollutants from reaching waterways by trapping sediment and other material picked up by stormwater runoff. Catch basins are the metal grates found in parking lots that allow stormwater to drain away. They also include a sump to trap sediment to keep it out of the storm drainage system.
Catch basins need regular maintenance to remove trapped sediment and debris. Businesses are responsible for cleaning catch basins on their properties to prevent pollution from reaching the stormwater system and streams. When sediment and debris fill 60% of the sump or when clearance from pipes is less than 7", catch basins must be cleaned out.
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