Obstructions

The purpose of this page is to define obstructions, a commonly used term in floodplain management. To explore other common floodplain management terms access the NFIP Policy Index.

Definition/Description

All new construction and substantial improvements in V Zones must have the space below the lowest floor either free of obstruction or constructed with non-supporting breakaway walls. Foundations that offer minimal resistance to floodwaters passing beneath an elevated building are required in V Zones. Fill is prohibited for the structural support of buildings in V Zones.

NFIP Requirement

• 60.3 - Criteria for land management and use
  • (e) (5) Free of Obstruction Requirement
  • (e) (6) - Fill in V Zones

Other Applicable NFIP Regulations

• 60.3 - Criteria for land management and use
  • (a) (3)
  • (e) (4)

Guidance

• IS-9 Managing Floodplain Development Through The National Flood Insurance Program (NFIP) (page 5-50)
• Free-Of-Obstruction Requirements (Technical Bulletin 5) (2008)

Related Keywords

• Breakaway Wall
• Coastal High Hazard Area
• Hydrodynamic Forces
• V-Zone Certificate
• Elevation