Floodplain Management After a Flood
National Flood Insurance Program Rebuilding Requirements
Many communities in Arkansas are suffering and recovering from extreme flooding. In many areas, flooding has hit record levels or levels not seen in decades. Residents and business owners are understandably anxious to repair damaged building components. Municipalities are already burdened with the necessity to make sure that structures are safe.
Flood Protection Requirements
Rebuilding requirements after a flood or any other disaster must also consider the flood protection requirements contained in community local laws that were passed as a condition of participation in the National Flood Insurance Program. A primary goal of the National Flood Insurance Program is to break the damage - rebuild - damage cycle by requiring all new and substantially damaged structures within mapped flood hazard areas to be constructed in a manner that is reasonably safe from flooding. That requires proper building elevation and protection techniques.
The definition of substantial damage is: damage of any origin sustained by a structure whereby the cost of restoring the structure to its before damaged condition would equal or exceed 50 percent of the market value of the structure before the damage occurred. This definition applies whether or not actual repair work is performed. FEMA regulations (44 CFR 60.3) require substantially damaged structures within mapped flood hazard areas to meet specific floodplain development standards. The purpose of these requirements is to make sure that damage is minimized when the next flood occurs. It is the responsibility of local communities as participating communities in the National Flood Insurance Program to determine if a damaged structure is in a FEMA mapped flood hazard area and, if so, to determine if the structure has been substantially damaged.
If a structure has been substantially damaged, it must then meet the flood protection requirements. ANRC staff is available to assist your community with the requirements; however we cannot make the substantial damage determinations on your behalf.
After a federal disaster declaration, FEMA and ANRC staff will also be available to provide assistance.
Some Rules of Thumb on Assessing "Substantial Damage"
As an example, if a structure has been moved off its foundation, it is nearly certain that it has been substantially damaged. The U.S. Army Corps of Engineers has estimated that substantially damaged thresholds are approached once flood waters exceed about three feet above the first floor on a traditionally constructed structure with no basement,. In such situations, a more detailed determination of damages and comparison to the market value of the structure is required. FEMA has developed guidance on substantially damaged structures. That can be found in the manual "Answers to Questions about Substantially Damaged Buildings", available for download from FEMA. Also available is the Substantial Improvement/Substantial Damage Desk Reference.
FEMA also has an electronic "Substantial Damage Estimator" that can be downloaded from the FEMA website. When determining if a structure has been substantially damaged, you must compare the cost of returning the structure to its before damaged condition to the market value of the structure prior to the damage. Acceptable estimates of "cost of repair" or damage sustained include itemized estimates by a licensed contractor or other professional estimators in the construction industry. For structures with a National Flood Insurance Program (NFIP) policy, you may also use the damage estimate by the NFIP claims adjuster for the structure only, not including contents. You may also use building code valuation tables published by the major building code groups. The building department may use its own professional judgment based on knowledge of local and regional building costs. However, you must be consistent in your judgment. FEMA's "Substantial Damage Estimator" can help, and has withstood legal scrutiny. The market value pertains only to the structure. Market value may be determined by a professional appraiser, or the community may use the adjusted property appraisal for the structure only. Other techniques may be used as screening tools. However the closer the damage comes to 50 percent, the greater the accuracy of the determination should be.
Substantial Damage in the Regulatory Floodway
In some cases, a damaged structure may be located within a FEMA designated regulatory floodway. The floodway is a narrower portion of a riverine floodplain and must be kept clear of new development in order to pass flood flows without increasing flood elevations by any measurable amount. If a damaged structure is within the floodway, and has been deemed to be substantially damaged, the structure may be repaired on the same site provided that it is elevated in accordance with floodplain development requirements, and the footprint does not exceed the pre-existing footprint of the structure. If the footprint of the structure expands within the floodway, or if the owner plans to bring fill into the floodway, then an engineering analysis is required to prove that the encroachment does not increase flood elevations.
Do You Need Assistance?
For further assistance on floodplain development requirements during this difficult time, or at any time, please call your local floodplain management official, or ANRC's Floodplain Management Section at 501-682-1611. Below is specifc contact information for ANRC Floodplain Management Staff.
Whit E. Montague, CFM
State NFIP Coordinator
Dam Safety & Floodplain Management Section
Phone: (501) 682-3969
Veronica Villalobos-Pogue, CFM, ACEM
Flood Mitigation Assistance Grant Program Coordinator
Dam Safety & Floodplain Management Section
Phone: (501) 682-3982