Equalizer

A culvert placed where there is no channel but where it is desirable to have standing water at equal elevations on both sides of a fill.

Erosion

Deterioration of a surface by the abrasive action of moving fluids. This is accelerated by the presence of solid particles or gas bubbles in suspension. When deterioration is further increased by corrosion, the term “Corrosion-Erosion” is often used.

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.