Silt Basins

Basins to interrupt the flow of sewage may be installed on storm sewers to provide a place for the deposition of grit particularly on sewers where there are no catch basins. In order to promote the deposition of grit the velocity of flow should not be greater than 0.6m/s, and to prevent the deposition of organic matter it should not be less than 0.3 m/s. Silt basins are undesirable on separate or on combined sewers because of the inevitable collection of organic matter.