Floodwalls and Levees Advantages and Disadvantages

Advantages Disadvantages Protects the area around the structure from inundation without significant changes to the structure Does not satisfy the NFIP requirements for bringing substantially damaged or improved structures into compliance Eliminates pressure from floodwaters that would cause structural damage to the home or other structures in the protected area May fail or be overtopped by large floods or floods of long duration In some cases, costs less than elevating or relocating the structure May be expensive depending on height, length, availability of materials, and other factors Allows the structure to be occupied during construction Requires periodic maintenance Reduces flood risk to the structure and its contents Requires interior drainage Reduces the physical, financial, and emotional strains that accompany flood events May affect local drainage, possible resulting in water problems for others   Does not reduce flood insurance premiums   May restrict access to structure   Requires considerable land (levees only)   Does not eliminate the need to evacuate during floods   May require warning and human intervention for closures   May violate applicable codes or regulations