FHWA Hydraulic Toolbox
Gov-Public
A free bundle of FHWA drainage calculators: channels, weirs, curb & gutter, riprap, detention and more.
Hydraulics & River SystemsStableOpen Channel FlowRational Method
3 tools · Topic
Bridge Scour Analysis Tools
Scour is the leading cause of bridge failure, and HEC-18 defines how to compute it. Indexed here: scour calculators, hydraulic models with scour modules and the utilities used for pier, abutment and contraction scour checks.
HEC-RAS
FreeVerified
The world's most used hydraulic model: free 1D/2D river analysis, sediment, water quality and flood mapping.
Hydraulics & River SystemsActiveRiver Modelling2D Hydraulic Modelling
SRH-2D
Free
The US Bureau of Reclamation's free 2D river model — FHWA's preferred engine for bridge hydraulics.
Hydraulics & River SystemsActive2D Hydraulic ModellingRiver Modelling