The Hydrologic Engineering Center (HEC) in Davis, California developed the River Analysis System (RAS) to aid hydraulic engineers in channel flow analysis and floodplain determination. It includes numerous data entry capabilities, hydraulic analysis components, data storage and management capabilities, and graphing and reporting capabilities.


Krey Price

International Water Training Institute

Educated at the University of California at Berkeley, Krey is a civil engineer and project manager with international experience in water resources. He is engaged in computational modelling, engineeri... Read more

Robert Keller

R. J. Keller & Associates and Monash University

Dr Keller has worked exclusively as a hydraulics engineer and modelling specialist since 1972.  His main areas of expertise are steady and transient flow analyses of pipe network and irrigation syste... Read more

Mark Forest

HDR Engineering

Mark has over 34 years of experience in water resources engineering, specialising in flood control planning and design, floodplain management, rainfall/runoff modelling, hydraulic modelling, dam breac... Read more

Dam Break Analyses (Aerial Map Animation), Bald Eagle Sunny Day Failure:

Credit: US Army Corps of Engineers

HEC-RAS allows the user to perform 1D steady flow, one and 2D unsteady flow calculations, sediment transport/mobile bed computations, and water temperature/water quality modelling. Over six years since the last release, Version 5.0 recently been made available for free download. The new version includes two-dimensional floodplain modelling, unsteady sediment transport, bank erosion, water quality, and the RAS Mapper GIS interface.

Attendee Locations (as of 3/5/17):

Interested in the capabilities available in HEC-RAS? Further details are available from the US Army Corps of Engineers.

New Orleans Hurricane Katrina. Aug 2005. Photo David.J.Phillip/AP