Inflow and infiltration (I/I) sources are identified during condition assessments; knowing where to begin assessment efforts can be difficult. Flow monitoring prioritizes flow meter basins for further study, but this approach presents challenges with well over 1,000 flow meter basins. The City of Houston needed an out-of-the-box solution to assess their 1,500 flow meter basins. The City and RJN Group tackled the challenge of modeling I/I to create a prioritized assessment program called the “I/I Cafeteria Plan.” The City wanted a way to prioritize meter basins and estimate quantities of I/I while identifying potential I/I sources. The tool considers the unique challenges for a flat coastal city with no zoning regulations enabling the City to efficiently and cost-effectively implement I/I reduction solutions. A phased approach was identified: Phases I/II created the framework, Phase III calibrated the model, Phase IV will be to implement automated solutions.

Contributor/Source

Jason Maldonado, CFM;Tristan Nickel, PE, AWAM;Jack Canfield

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