The Big Picture: An Effective Wet Weather Management Program

The Henrico County, Virginia, Wet Weather Management Program controls peak wet weather flows by a combination of (1) sewer rehabilitation to reduce rainfall-derived inflow and infiltration (RDII), (2) increased collection system conveyance capacity, and (3) increased in-system storage. This paper describes the overall evolution of the County's Wet Weather Management Program, discusses the major integrated elements and steps used in its development, and describes how the program is designed to change in the future to provide for sustainable overall infrastructure improvement. This study of one utility's successful strategy over the last 22 years provides guidance and lessons learned for utility managers, engineers, and operators to consider for implementation.