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Commission approves revisions to subdivision drainage design standards to tighten runoff and velocity limits
Summary
The Planning and Zoning Commission voted unanimously to amend the subdivision ordinance’s local drainage design standards to require more detailed runoff values, lower allowable flow velocities and tighter detention-release targets to reduce downstream erosion and flooding risks.
The Planning and Zoning Commission voted unanimously to recommend changes to the subdivision ordinance’s local drainage design standards. Staff described a package of amendments intended to improve stormwater management and reduce downstream erosion tied to recent development patterns.
Key changes presented by city engineering staff include: - Clarifying use of hydrologic methods: the modified rational method remains standard for smaller basins, but the unit hydrograph method will be required above a 200‑acre threshold. - Expanded runoff coefficient (C-value) table: the ordinance replaces a small set of broad coefficients…
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