Levee Analysis and Mapping Procedures

This public review document describes the Federal Emergency Management Agency (FEMA) proposed approach and procedures for analyzing and mapping areas on the landward side of non-accredited levee systems on Flood Insurance Rate Maps (FIRMs). Under the former levee analysis and mapping approach—referred to by FEMA and stakeholders as the without levee approach—if a levee system did not meet the National Flood Insurance Program (NFIP) requirements detailed in the Code of Federal Regulations (CFR) at Title 44, Chapter 1, Section 65.10 (44CFR65.10), FEMA modeled and mapped the system to show that the entire system did not reduce flooding impacts on the landward side of the levee during the 1-percent-annual-chance flood.