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Council hears final drainage master plan; staff recommends adopting preliminary county maps and nine priority projects
Summary
Consultants presented a rapid-assessment drainage master plan that identifies about 741 structures newly within a 1% annual-risk floodplain on preliminary county maps, ranks candidate projects and recommends the city adopt Williamson County's preliminary floodplain maps for development review and pursue funding for priority projects.
Consultants and city staff presented the final Hutto Drainage Master Plan at the April 3 council meeting, saying preliminary county flood mapping and updated rainfall data greatly expanded the city's estimated flood exposure and that a prioritized package of projects and monitoring investments will be needed to reduce risk.
City Engineer Matt Recker and consultant Andy Brook (project lead) summarized the study. Brook said the county's preliminary work and newer precipitation data (Atlas 14) increased Hutto's estimated structures in the 1% annual chance floodplain from about 71 to roughly 741 within city limits. "A 100-year flood plain doesn't occur once every 100 years; it has a 1% chance of occurring in any given year," Brook told council. He said the study used…
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