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
FHWA Hydraulic Toolbox
StableA free bundle of FHWA drainage calculators: channels, weirs, curb & gutter, riprap, detention and more.
by US FHWA
- Pricing
- Gov-Public
- License
- US Government (public domain)
- Commercial use
- Permitted
- Ecosystem
- Standalone
- Platform
- Windows
About FHWA Hydraulic Toolbox
The Hydraulic Toolbox collects the everyday calculators of highway drainage design into one free FHWA program: open-channel normal/critical depth, weir and orifice flow, curb-and-gutter and inlet spread, riprap sizing, rational-method peaks and simple detention routing — each following the relevant FHWA circular (HEC-22, HEC-15 and friends).
It will not replace a network model, but for the dozens of small calculations in any roadway or site drainage package it provides agency-recognised methods with printable output. Pairs naturally with HY-8 for crossings.
Where it fits in the workflow
TerrainCatchmentRainfallRunoffRoutingHydraulicsMappingReporting
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