Rainwater surface drainage is typically performed by the use of Catch Basins, or sometimes referred to as Inlets. The Catch Basin is a belowground box structure with a horizontal opening at ground level, where a perforated grate is placed to allow rainwater to enter into the Catch Basin box. The grate is made of a material that best fits the intended use of the surface level. Generally, a parking lot would utilize a cast iron grate that is rated for vehicular rating. For pedestrian areas, a light duty grate can be used.
During a rain event, stormwater drains from the surface area into the grate openings of the Catch Basin. This water then drains into a sewer pipe that is connected to the Catch Basin box structure. The stormwater sewer piping is placed at a downward sloping gradient to encourage water to flow through the piping; this is also known as “gravity-flow”. Catch Basins can be linked up with pipe to create a network of drainage points.
The catch basin is a utility product which is at the forefront on stormwater applications. It is also known as storm drain inlet or curb inlet. The catch basin is mainly an opening to the storm drain system, it typically includes a grate or curb at street level where stormwater enters the unit and a sump capture sediment, decries and associated pollutants. Catch basins results important because they prevent storm sewer blockages and minimize the amount of pollutants entering storm sewers.
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