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Tunnel boring machine.

Total Maximum Daily Load (TMDL)

A calculation of the maximum amount of a pollutant or pollutants that a waterbody can receive and still meet established water quality standards.  These standards are dependent on the intended use of the waterbody such as drinking, swimming, or fishing.

Toxic Pollutants

Any substance whether gaseous, liquid or solid which, when discharged to a wastewater system watercourse in sufficient quantities, interferes with or passes through any wastewater treatment process, or constitutes a hazard to human beings, animal life, plant life, or inhibits aquatic life.

Tree Box Filters

Containers typically installed beneath street or sidewalk level in which trees are planted. Runoff is directed into the tree box where it is filtered by soil and vegetation and then discharged into a storm drain system. This improves the water quality and delays the peak flow of water entering the storm drain system.

Trunk Sewer

A sewer that receives wastewater from many tributary branches and sewers lines and serves as an outlet for a large territory or is used to feed an intercepting sewer.