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City utility study: water treatment capacity and South-side sewers limit growth under aggressive scenario
Summary
City staff told the council that modeled scenarios show Ann Arbor’s water supply and treatment plant can support aggressive growth for roughly two decades, but sanitary collection in the southern district and treatment plant wet-weather capacity are constraints that will require targeted capital projects.
Skye Stewart, chief of staff for public services, told the council the city’s recently completed water‑distribution and sanitary‑sewer studies modeled an aggressive growth scenario to test where the system would fail. “We modeled an…scenario of 1,800 additional REUs per year for 20 years,” Stewart said, using residential equivalent units (REUs) as the study’s common planning metric.
The modeling found the city’s source water — primarily the Huron River with supplemental airport wellfields — and the water treatment plant’s rated capacity (about 47,000,000 gallons per day) would be sufficient to sustain that scenario for roughly 19–20 years, the consultants reported. Troy Baughman, the senior utility…
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