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Staff proposes moving stormwater‑facility landscaping into SWIM to improve function and predictability
Summary
City staff recommended consolidating stormwater‑facility landscaping standards into the Stormwater Management Manual (SWIM), citing 39 field observations that show rock‑only basins often underperform, create maintenance burdens, and produce inconsistent outcomes. Staff asked the commission for direction and more localized life‑cycle cost analysis.
City staff told the Planning Commission they plan to consolidate stormwater‑facility landscaping requirements into the city’s Stormwater Management Manual (SWIM) to reduce subjective interpretations and inconsistent outcomes in detention and retention basins. The proposal responds to stakeholder feedback and a summer field survey of 39 ponds (11 nonresidential, 28 residential) that identified a pattern of maintenance and functionality problems, particularly with rock‑only basins.
Why it matters: Staff said some basins built with rock mulch meet the city’s landscape definition but perform poorly as water‑quality and sedimentation basins. Rock‑only basins can collect several inches of sediment that are difficult to remove, become weedy…
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