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Coconino County staff recommend adopting larger local floodplain after August 2023 floods
Summary
Coconino County staff and consultants presented new hydrologic and hydraulic modeling for Coconino Wash and its tributaries near Tusayan and recommended the county recognize a larger local floodplain and revise local regulations to treat that area the same as FEMA special flood hazard areas.
Coconino County staff and consultants presented new hydrologic and hydraulic modeling for Coconino Wash and its tributaries near Tusayan and recommended the county recognize a larger local floodplain and revise local regulations to treat that area the same as FEMA special flood hazard areas.
Ian Sharp, civil engineer with JE Fuller, told the board that the current FEMA Zone A maps are “basically a Sharpie on a map” and do not reflect the true flood risk. Sharp said the district’s FEMA-quality modeling shows a much larger inundation area that includes tributaries and approaches Tusayan.
The presentation reviewed the August 2023 storm, which Sharp summarized as producing about 3.5 inches of rain at the watershed center and roughly 0.5 inches at the watershed edge. A…
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