Federal drainage guidance
Federal Highway Administration (FHWA) hydraulic circulars and related federal design manuals. These are national guidance, not adopted local criteria — always verify against the controlling jurisdiction manual.
- HDS-4 Introduction to Highway HydraulicsFederalFederal Highway Administration
- HEC-14 Hydraulic Design of Energy Dissipators for Culverts and ChannelsFederalFederal Highway Administration
- HEC-15 Design of Roadside Channels with Flexible LiningsFederalFederal Highway Administration
- HEC-21 Design of Bridge Deck DrainageFederalFederal Highway Administration
- HEC-22 Urban Drainage Design ManualFederalFederal Highway Administration
- HEC-24 Highway Stormwater Pump Station DesignFederalFederal Highway Administration