An Aggressive I/I Abatement Program is Underway as Part of Vallejos Wet Weather Programby Mike Walkowiak,
Abstract: The Vallejo Sanitation and Flood Control District (VSFCD) is undertaking an aggressive pilot program to control wet weather flows and eliminate sanitary sewer overflows (SSOs) that are in violation of its NPDES permit. The program involves extensive rehabilitation of sewer mains, manholes, and service laterals (including laterals on private property) in five selected basins to remove defects that allow rainfall dependent infiltration and inflow (I/I) to enter the sewer system. The rehabilitation projects were designed through extensive analysis of the Districts system, including CCTV and smoke testing inspections, comprehensive mapping of the system in a GIS format, flow monitoring, hydraulic modeling, assessment of historical SSO records, and evaluation of maintenance records. This paper will present the process of developing and implementing the I/I abatement program.
Subject Headings: Geographic information systems | Rehabilitation | Sewers | Recharge basins | Hydraulic design | Model tests | Hydraulic models | Floods
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