Flood Protection and Elevation of Building Utilities: Iowa Floods of 2016 Recovery Advisory [open pdf - 2MB]
From the Purpose and Intended Audience Section: "This Recovery Advisory addresses houses that were not Substantially Damaged during the floods of 2016 and are not undergoing Substantial Improvement (see text box for NFIP [National Flood Insurance Program] definitions of these terms). Repair and restoration work on these houses must be done in compliance with all floodplain management requirements in effect when the home was originally built (though protecting utilities to newer floodplain management ordinances may also be acceptable and will further reduce vulnerability to flood damage). Homeowners should always check with local building departments, as locally enforced codes and standards may differ from what is described in this Recovery Advisory. For example, some communities may require that all utility system restoration or alteration work must comply with the applicable sections of the current code, even in houses that are not determined to be Substantially Damaged. When considering relocating or elevating systems, all applicable codes, regulations, and manufacturers' installation requirements should be followed."
Federal Emergency Management Agency: https://www.fema.gov/