Floodplains
Principal Documents
Regulation
Policy
- Highway Embankments versus Levees and other Flood Control Structures (09/10/2008)
- Backwater Criterion for Hydraulic Design of Structures (04/21/1992)
- Dam as a Foundation for a Highway (12/09/1991)
- Highways Affected by Water Resources Development Projects (12/09/1991)
- Design Standards for Highways in National Flood Insurance Program Mapped Floodplains (04/02/1986)
- Significant Encroachments (04/02/1985)
- Procedures for Coordinating Highway Encroachments on Floodplains with the Federal Emergency Management Agency (FEMA) (06/25/1982)
- DOT Order 5650.2 - Floodplain Management and Protection (04/23/1979)
Guidance
- Storm Drainage, Cast-In-Place Non-Reinforced Concrete Pipe, Flood Plain Encroachments and Highways In National Flood Insurance Program Mapped Floodplains, Coordinating Highway Encroachments on Floodplains With FEMA 23 CFR 650 A - NS Sec. 650.115 (09/30/1992)
- Guidance for Preparing and Processing Environmental and Section 4(f) Documents (T6640.8A) (10/30/1987)
- Guidance for Implementing the One-Foot Standard for Encroachments on NFIP Floodplains (12/22/1986)
Publications
- HEC 17 - Highways in the River Environment - Floodplains, Extreme Events, Risk, and Resilience, 2nd Edition (June, 2016)