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Subcommittee weighs storage vs. pump sizing after Stantec flags 385,000-gallon peak-day scenario
Summary
Stantec told the subcommittee that a modeled maximum-day (buildout) peak flow would require roughly 385,000 gallons to send all flow during a low-flow window—an impractical storage requirement—so the design balances modest wet wells with a 330 gpm pump design to limit tank size and reduce pump cycling.
Stantec told the subcommittee that storing an entire modeled maximum-day peak (used for worst-case wet-weather planning) would require roughly 385,000 gallons—an amount the firm said is impractical to build or site within the district. Johnny Zukowski Lukowski explained that trying to hold and then pump that full peak in a short low-flow window would create extremely large storage needs and very high instantaneous pump flows if the storage strategy were used exclusively.
Instead, Stantec proposed a compromise: smaller equalization wet wells to smooth flows and a 330 gpm design pump to limit cycle frequency and equipment stress. Committee members cautioned that the peaking factors in prior studies are conservative and asked Stantec to document the selected peaking assumptions and potential lower-bound scenarios in the 30% memo so the board understands how storage volume and pump choices affect capital and operating cost.
