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City staff proposes moving stormwater‑facility landscaping rules into SWIM manual to reduce ambiguity
Summary
Grand Junction staff told the planning commission that detention‑basin landscaping language in the zoning code creates a loophole that allows rock mulch to meet 'landscape' requirements while failing stormwater and water‑quality functions. Staff recommended consolidating technical standards into the Stormwater Management Manual (SWIM) and asked consultants for life‑cycle cost data.
Staff told the planning commission that current zoning‑code language defining "landscape" allows rock mulch and other nonvegetative treatments that can satisfy the code’s aesthetic language but perform poorly as water‑quality and erosion‑control Best Management Practices (BMPs).
Presenters said field observations (39 ponds reviewed after two major storms—11 nonresidential, 28 residential) found rock‑only basins had higher failure rates for sediment trapping, clogging and weed pressure; vegetated basins—even sparsely vegetated ones—generally performed better at settling…
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