South Holland - Flow Monitoring

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The project included identification of dry weather and wet weather flow conditions and ranking the relative severity of observed rainfall dependent infiltration and inflow (RDII). A total of 31 temporary flow monitors and 5 temporary rain gauges were installed to evaluate system performance and collect data for analysis.

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The results included identification of peaking flow factors and the ability to determine hot spot sewer basins that contribute the most I&I into the sanitary sewer system, along with development of a roadmap for the Village to follow the next Sanitary Sewer Evaluation Survey (SSES) steps to narrow down I&I. Additional outcomes included implementation of smoke testing, manhole inspections, and closed-circuit televising (CCTV), as well as the ability to view where surcharging frequently occurs, establish operational capacity, determine if sewer basins are self-cleansing, and identify areas that need to be placed on a maintenance jetting list.