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Council adopts updated Stormwater Management Design Manual, incorporates wildfire runoff guidance
Summary
Flagstaff adopted a rewritten Stormwater Management Design Manual (2025) by resolution and read an ordinance adopting it by reference. The update replaces the 2009 manual, simplifies guidance, adds burned‑watershed and two‑dimensional flood modeling guidance and incorporates modern references for hydraulics and design.
Flagstaff — The City Council approved a rewritten Stormwater Management Design Manual on March 4 and authorized adoption of the document by reference into city code, replacing the 2009 manual.
Consultants and city stormwater staff said the new 2025 manual updates procedures and standards, clarifies definitions, and simplifies the document by referencing established, detailed design material where appropriate. Key additions include guidance for post‑wildfire burned watershed runoff, updated hydrology parameters specific to Flagstaff, and 2‑D flood modeling guidance to reflect modern practice.
Rick Schuler, consultant with Woodson (project…
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