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Milwaukie planning commission backs ‘no net loss’ floodplain standards, recommends city council adoption
Summary
The Milwaukie Planning Commission unanimously recommended city council adopt amendments to Title 18 to implement “no net loss” floodplain standards, adding mitigation ratios for flood storage, impervious surface, and tree replacement and creating a 170-foot riparian buffer zone standard.
The Milwaukie Planning Commission on a unanimous vote recommended that Milwaukie City Council adopt amendments to the city’s flood-hazard regulations to implement “no net loss” standards for key floodplain functions.
City senior planner Brett Kelvorp told commissioners the draft changes respond to recent federal guidance and aim to keep Milwaukie eligible for the National Flood Insurance Program. "I've been working on this, this code amendment project related to our flood hazard ordinances," Kelvorp said, outlining provisions that increase mitigation requirements and add protections for floodplain storage, water quality and riparian vegetation.
The amendments add specific mitigation ratios and a new riparian buffer zone (RBZ) that is measured as 170 feet from the top of bank within mapped floodplain areas. Under the draft rules, fill that reduces flood-storage capacity would generally require a 2:1 replacement ratio; new impervious surface within the…
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