Reference Groundwater Level

The reference groundwater elevation.

Regression Analysis

An evaluation of the long-term hoop stress data. A linear curve is calculated using the least Squares method to fit the logarithm of hoop stress versus the logarithm of the resulting hours-to-failure.

Regulator

A device for controlling the quantity of sewage and storm water admitted from a combined sewer collector line into an interceptor, pump station or treatment facility, thereby determining the amount and quality of the flow discharged through an overflow device to receiving waters or other points of disposal.

Rehabilitation

(1) All methods for restoring or upgrading the performance of an existing pipeline system. (2) Methods by which the performance of a length of sewer is improved by incorporating the original sewer fabric, but excluding maintenance operations such as tree root or silt removal. Or rehabilitation In situDescribes work on site; in the original place. For example, in situ concrete would differentiate cast in place concrete from precast concrete. renovation to improve the performance and extend the life of a defective pipeline, incorporating the fabric of that pipeline. Rehabilitation(1) All methods for restoring or upgrading the performance of an existing pipeline system. (2) Methods by which the performance of a length of sewer is improved by incorporating the original sewer fabric, but excluding maintenance operations such as tree root or silt removal. Or rehabilitation In situ renovation to improve the performance and extend the life of a defective... may be to address structural and/or hydraulic weakness.

Reinforcement

The provision of an additional sewer which in conjunction with an existing sewer increases overall flow capacity.