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Redmond previews updated collection-system master plan; few near-term capacity deficiencies found
Summary
Consultants and city staff presented a near-final wastewater collection-system master plan that models 20-year growth, recommends permanent flow monitoring, identifies a handful of capacity deficiencies and sets a project list for SDC updates and the five-year CIP.
City of Redmond staff and consultant Anderson Perry gave the council a preview of a near-final collection-system master plan that examines system capacity, condition and capital needs over a 20- year planning horizon.
Josh Robertson of Anderson Perry and city staff said the plan used updated hydraulic modeling informed by on-site flow monitoring, a condition assessment, and Portland State University population forecasts available at the plan’s start. The analysis included a 20-year horizon and a build-out scenario that loaded additional density following House Bill 2001 assumptions.
The plan’s capacity analysis found the city’s collection system has relatively few capacity deficiencies in the 20-year horizon, a result staff credited to recent flow monitoring. Staff recommended establishing a permanent flow-monitoring program to detect future triggers and avoid surprise surcharges. The plan does identify several localized deficiencies and two pump stations requiring attention: the U lift station (linked to the DSL large-lot industrial development) and Lawson Crossing pump station in the West Redmond area plan.
A condition assessment using CCTV inspections and installation-year data showed most pipelines are in good repair; staff reported no outstanding pipe deficiencies beyond routine maintenance. The master-plan outputs include an updated capital improvement program and a project list intended to feed an SDC update and the city’s five-year CIP.
Staff said next steps include DEQ review, a 35-day notice to the Department of Land Conservation and Development (DLCD), a Planning Commission hearing and a City Council hearing, followed by an SDC update to align fees with the new project list.
Ending: Staff noted the Redmond Wetlands Complex design accommodates anticipated flows from nearby jurisdictions but that funding commitments from partners are incomplete; staff said early funding for wetlands included about $1 million from Deschutes County via cash or ARPA.
