Catch Basins

Catch basins (see Figure 7.11.7) are used as a junction for changes of direction of sewer branch lines. The location of sewer branch junctions may coincide so that a catch basin can be substituted for a sewer box, which is provided for surface drainage. A catch basin is also used as a junction for a change in diameter (size) of all sewer mains. Catch basins with open tops covered with grating are

Inlet chamber

Outlet chamber

Sag pipe

Inlet chamber

Outlet chamber

Sag pipe n

(a) Depressed sewer A

(a) Depressed sewer A

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