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Engineers identify inflow as main source of extra wastewater; Bellaire staff recommends targeted rehabilitation program
Summary
Friese & Nichols presented a sanitary sewer evaluation showing inflow — not groundwater infiltration — is the primary driver of peak wastewater in several basins. Staff recommends an 8-year, basin-by-basin sanitary sewer evaluation and rehabilitation (SSES) program and budgeting tied to the city's CIP and bond funds.
Friese & Nichols presented results of a year-long sanitary sewer flow monitoring study to the Bellaire City Council on June 16, 2025, finding that inflow (stormwater entering the system) accounted for most excess wet-weather flow and recommending a prioritized sanitary sewer evaluation and rehabilitation (SSES) program.
The study installed 12 flow meters and four rain gauges and monitored flow for more than 100 days to identify wet- and dry-weather flow characteristics across the system. Friese & Nichols reported inflow as the dominant component of I&I (inflow and infiltration), with infiltration representing roughly 10% of the measured I&I. The firm ranked basins by gallons per day per 1,000 linear feet; the basin around FM 11 near the…
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