ERW

Electrical Resistance Welding

Estimated Remaining Life (ERL)

A value determined by the inspectors based on experience, judgment, and guidelines within the manual that predicts the amount of time that a sewer structure will remain in a “fit-for-use” condition.

Estuaries

Descriptive of the transition where rivers meet the sea, and currents meet tides.

Execution Department

A department that provides the sewer inspection service.

Exfiltration

The leakage or discharge of flows being carried by sewers out into the ground through leaks in pipes, joints, manholes, or other sewer system structures; the reverse of “infiltrations.”