About HEC-HMS

HEC-MHS is a public domain hydrologic modelling software application developed by the U.S. Army Corps of Engineers Hydrologic Engineering Centre. Following are some downloads and links relevant to HEC-HMS:

From the U.S. Army Corps of Engineers website:

The Hydrologic Modeling System (HEC-HMS) is designed to simulate the complete hydrologic processes of dendritic watershed systems. The software includes many traditional hydrologic analysis procedures such as event infiltration, unit hydrographs, and hydrologic routing. HEC-HMS also includes procedures necessary for continuous simulation including evapo-transpiration, snowmelt, and soil moisture accounting. Advanced capabilities are also provided for gridded runoff simulation using the linear quasi-distributed runoff transform (ModClark). Supplemental analysis tools are provided for model optimization, forecasting streamflow, depth-area reduction, assessing model uncertainty, erosion and sediment transport, and water quality.

The software features a completely integrated work environment including a database, data entry utilities, computation engine, and results reporting tools. A graphical user interface allows the user seamless movement between the different parts of the software. Simulation results are stored in HEC-DSS (Data Storage System) and can be used in conjunction with other software for studies of water availability, urban drainage, flow forecasting, future urbanization impact, reservoir spillway design, flood damage reduction, floodplain regulation, and systems operation.

Training Services

Register your interest for open or in-house course in your area in 2018! Learn what's new in HEC-RAS 5.0.4 and get started with our Introductory Workshop document. Who attends our courses?  What are they saying?

Consulting Services

Need help setting up, reviewing, or troubleshooting models? We also offer drainage designs, surface water management plans, QA/QC, and more. See our consulting services or book in customised, in-house training.

Links and Downloads

Click here to subscribe to our e-mail list and receive the latest HEC-RAS updates, such as our recent articles about wormhole culverts, terrain manipulation, rating curves, ARR 2016, and 2D benchmarking.