Software

The FHWA software available at this site is in the public domain and is available for downloading as zipped files or self-extracting zipped files. This software may be downloaded and used without restriction.

By downloading the software, the user accepts responsibility for understanding the following conditions and limitations, and agrees to them:

The FHWA does not provide user assistance or support for this software.
The application of this software is the responsibility of the user. It is imperative that the responsible engineer understands the potential accuracy limitations of the program results, independently cross checks those results with other methods, and examines the reasonableness of the results with engineering knowledge and experience.
There are no expressed or implied warranties.

Links to software produced by others (HEC-RAS, WMS, and SMS) are also provided below.

FHWA Hydraulics Engineering Software
Application	Software and Tools	Date	Contact
Culvert Hydraulic Analysis & Design	HY 8 Culvert Hydraulic Analysis Program Companion Resource: HDS 5: Hydraulic Design of Highway Culverts, Third Edition	2016	Eric Brown
Aquatic Organism Passage (AOP) Design	Companion Resource: HEC 26: Culvert Design for Aquatic Organism Passage	2011	Bart Bergendahl
Bridge Scour Assessment and Summary Riprap Analysis Channel Lining Design Rock / Sediment Gradation Analysis Curb and Gutter / Inlet Analysis Detention Basin Analysis Rational Method Hydrologic Analysis Channel and Weir Analysis	Hydraulic Toolbox Companion Resources: HEC 15 Design of Roadside Channels with Flexible Linings, Third Edition HEC 18 Evaluating Scour at Bridges, Fifth Edition HEC 22 Urban Drainage Design Manual, Third Edition HEC 23 Bridge Scour and Stream Instability Countermeasures, Third Edition, Vol 1 & Vol 2	2014	Scott Hogan
Hydrologic Analysis (Rational method, Regression Equations, TR-55, TR-20, HEC-HMS) Basin Delineation Storm Drain Analysis & Pump Station Design (HY 12) HEC-RAS Model Development	Watershed Modeling System (WMS)* Companion Resources: DOT/FHWA Licensing Instructions (.pdf, 5 mb) WMS Instructions and Support WMS Tutorials HDS 2 Highway Hydrology, Second Edition HEC 22 Urban Drainage Design Manual, Third Edition HEC 24 Highway Stormwater Pump Station Design	2016	Scott Hogan
Two-Dimensional Hydraulic Analysis	Surface-Water Modeling System (SMS)* Companion Resources: DOT/FHWA Licensing Instructions (.pdf, 5 mb) SRH-2D Modeling Instructions and Guidance SRH-2D Tutorials (Basic Simulations, Bridge Pressure Flow, Culverts, Weirs, Diversions, etc.) HDS 7 Hydraulic Design of Safe Bridges	2016	Scott Hogan
One-Dimensional Hydraulic Analysis	Hydrologic Engineering Center’s River Analysis System (HEC-RAS) Companion Resources: Instructions for Extracting HEC-RAS Cross Sections from Microstation (.pdf, 5 mb) HDS 7 Hydraulic Design of Safe Bridges	2016	Scott Hogan
Climate Adaptation	Climate Change Adaptation Tools	2016	Mike Culp

* Through an arrangement between FHWA and Aquaveo, free WMS and SMS licenses are provided to state DOT and FHWA employees. Please refer to the licensing instructions (found under "Companion Resources" in the table above), for additional details and directions on downloading and registering these software programs.

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