Elevating Floodprone Buildings Above Minimum NFIP Requirements: Iowa Floods of 2016 Recovery Advisory [open pdf - 3MB]
From the Purpose and Intended Audience section: "Flooding in Iowa in the fall of 2016 extended beyond mapped Special Flood Hazard Areas (SFHA) and exceeded base flood elevations (BFEs) by several feet in some areas, though the flooding was not as widespread as the Midwest Floods of 2008. Lessons learned from those floods were incorporated into mitigation efforts since that time and successfully guided the repair and reconstruction efforts and design of new buildings to reduce susceptibility to future flood damage. This Recovery Advisory reviews how Flood Insurance Rate Maps (FIRMs) and BFEs are established and provides guidance on elevating buildings above minimum NFIP [National Flood Insurance Program] requirements to minimize flood damage. The intended audience for this advisory is primarily homeowners and designers, but it may be helpful to anyone involved in selecting lowest floor elevations for new construction and reconstruction of buildings in areas with riverine flooding across Iowa and other Midwest states."
Federal Emergency Management Agency: https://www.fema.gov/