Catch Basins

Catch basins are used to interrupt the flow of sewage before it enters the sewer, causing deposition of suspended grit and sludge and the detention of floating rubbish, which could enter and clog the sewer. A separate catch basin may be used for each inlet or, to save expense, the pipes from several inlets at a corner may discharge into the same catch basin. Various types of catch basins are successfully used - some holding water in a trap and others discharge directly into the sewer. The construction of the catch and its cover follows the principles given for the construction of manholes. In unusual situations it may be necessary to install a larger basin, but too large a catch basin is undesirable because of the probable production of bad odour.