The Limit of Moderate Wave Action (LiMWA) is the location where the 1-%-annual-chance wave height equals 1.5 feet. FEMA began showing the LiMWA on Flood Insurance Rate Maps to communicate the higher risk that exists in the area. Because the 1.5-foot breaking wave in the LiMWA zone can potentially cause foundation failure, communities are encouraged to adopt building construction standards similar to Zone VE in those areas.
Residents and business owners living or working in the LiMWA zone should be aware of the potential wave action along with floating debris, erosion and scour that could cause significant damage on their property. They are encouraged to build safer and higher to minimize the risk to life and property.