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Hayden amends sewer master plan after flow monitoring shows roughly 191 available connections on Hayden Avenue line
Summary
Council voted to adopt a flow-monitoring technical memo from JUB Engineers and amend the city's 2020 Sewer Master Plan after measured data showed about 191 additional connections are available before the line reaches critical capacity.
Hayden — The Hayden City Council voted to adopt a JUB Engineers flow-monitoring technical memo and amend the city's 2020 Sewer Master Plan to reflect measured rather than modeled sewer flows on a constrained sewer line along Hayden Avenue.
City staff described the work as an update that replaces modeled flows with actual measurements at a critical location. "We've got one place on Hayden Avenue that shows that we are at capacity for sewer flows," a city staff member said, explaining why the city contracted for monitoring. The flow monitoring found about 191 available connections on that line before it reaches critical capacity, staff reported.
Staff said the line serves much of the area north of Hayden Avenue and east of Government Way — approximately half of that service area — and that the measured capacity gives the city time to plan upgrades over the next few years. The report also notes that one short section of pipe is elliptical in shape; engineers adjusted measurements to account for the noncircular cross-section.
Council members asked follow-up questions about the service area and whether ongoing or proposed construction would affect capacity. Staff said no immediate new construction has been approved in the constrained area and developers requesting additional connections have been asked to delay until capacity improvements are planned.
Motion and vote: A motion to adopt the JUB Engineers flow-monitoring memo and amend the 2020 Sewer Master Plan was made and approved by roll call; recorded votes in the transcript indicate council members voted yes.
Why it matters: The amendment changes the city's planning baseline from model estimates to measured flows at a location approaching capacity, which affects how and when the city will permit new sewer connections and plan infrastructure upgrades.
What's next: The amended master plan will be used to guide permitting decisions and capital planning. Further engineering and repair projects to address the constrained line were discussed as items to be scheduled in coming years.
