Anna tightens floodplain rules, requires fully developed modeling and higher freeboard
Council adopted amendments to the flood‑damage prevention ordinance requiring modeling of the fully developed watershed, raising residential freeboard to 2 feet above the 'ultimate' floodplain and removing downstream assessment allowances; staff said the measure offers a higher standard than FEMA.
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The council unanimously adopted a significant update to the city's flood‑damage prevention ordinance that requires new developments to model the fully developed watershed and preserve downstream floodplain as needed. City Engineer Kevin Bates said the change raises the standard above the FEMA baseline and removes the prior allowance for downstream assessments that permitted up to a 10% local increase in flow under some conditions.
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