Catch Basins

Innovation  Retention & Conveyance


The Change in Philosophy from Conveyance to Retention. Traditional urban water management has ignored the water pollution impacts from storm water. As a result of increased land use intensification and increased climate variability it is critical to rethink how we design storm water management systems in new subdivisions and modify traditional systems during infrastructure replacements. The ultimate challenge is how to deal with cumulative problems at the watershed scale.


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Catch basins are chambers or sumps, usually built at the curb line, which allows surface water runoff to enter the storm water conveyance system. Many catch basins have a low area below the invert of the outlet pipe intended to retain course sediment. By trapping sediment, the catch basin prevents solids from clogging the storm main and being washed into receiving waters. Catch basins must be cleaned periodically to maintain their ability to trap sediment and consequently their ability to prevent flooding. The removal of sediment, decaying debris, and highly polluted water from catch basins has aesthetic and water quality benefits, including reducing foul odors reducing suspended solids and reducing the load of oxygen-demanding substances that reach receiving waters. Catch basin cleaning is easily implemented.

Traditional  / Conveyance

Stormwater Management