Flow Monitoring & Sewer System Evaluation Surveys (SSES)
Temporary flow meters placed strategically to isolate which sub-basins are contributing the most I&I.
A sewer system evaluation survey deploys temporary flow meters at strategic sub-basin points to quantify and localize I&I contribution before committing capital to rehabilitation.
Meter placement should isolate progressively smaller sub-basins in a logical sequence, narrowing the search area rather than blanketing the whole system at once.
Rainfall-derived I&I (RDII) is typically quantified as a ratio of peak wet-weather flow to dry-weather baseline flow, giving a standardized way to compare and prioritize sub-basins.
A multi-year flow monitoring program, rather than a single storm event, captures the variability between a moderate and an extreme storm and avoids over- or under-investing based on one atypical event.
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