Corbel

For brick manholes this term is sometimes used in place of cone, and indicates the gradual reduction in diameter by indenting brick.

Core Area

That part of a sewer network containing the critical sewers, and other sewers where hydraulic problems are severe and merit detailed investigation.

Corrosion

The destruction of a material or its properties because of a reaction with its (environment) surroundings.

Corrosion Fatigue

FatigueThe phenomenon leading to fracture under repeated or fluctuating stresses having a maximum value less than the tensile strength of the material. type cracking of metal caused by repeated or fluctuating stresses in a corrosive environment characterized by shorter life than would be encountered as a result of either the repeated or fluctuating stress alone or the corrosive environment alone.

Corrosion Index

Measurement of the corrosivity of a water (e.g. Langelier Index, Ryznar Index, AggressiveA property of water which favors the corrosion of its conveying structure. Index, etc.)