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Sponsored by Lorman Education
Product ID: 407364EAU
Credit & Course Provided by:

Introduction to HEC-RAS Modeling

OnDemand Webinar (89 minutes)

Understand the basics behind one-dimensional computational hydraulics in order to set up and apply HEC-RAS.Many aspects of site development, road construction or other civil projects ultimately involve the computational modeling of the flow of water. The Hydrologic Engineering Center-River Analysis System (HEC-RAS) is a widely used, accepted, and versatile open channel hydraulics computational modeling software. It is universally approved by federal, state, and local agencies for a wide range of computational hydraulics applications. The steady one-dimensional approach is often used in applying HEC-RAS. You will learn the basics of steady one-dimensional computational hydraulics, including specifics utilized by the HEC-RAS software. It is essential to understand this basic theory of steady one-dimensional computational hydraulics, in order to successfully set up and apply HEC-RAS, and interpret results. You will also learn how to navigate the HEC-RAS user interface, including how GIS information is accessed. The material will tell how to build a HEC-RAS geometry using digital elevation data, how to specify steady flow discharges, how to assign boundary conditions, and how to execute a steady flow simulation, and view the results. The ability to successfully apply HEC-RAS to model open channel hydraulics is a skill that continues to be in demand.


Gregory H. Nail, Ph.D., P.E., University of Tennessee at Martin


Overview and Background

• Open Channel Hydraulics

• Definitions

• One-Dimensional Steady Conservation of Energy

• Uniform vs. Nonuniform Flow

• Sub-Critical vs. Super-Critical Flow

Water Surface Profiling

• Enhancements to Conservation of Energy

• Discharge Flows and Boundary Conditions

• Backwater vs. Forewater Calculations

• Trapezoidal Channel Example


• Origins and Development

• User Interface

• GIS Compatibility


• Projection File

• Terrain

• Topographic Map

• Aerial Imagery

Building and Executing a Steady Flow HEC-RAS Model

• RASMapper and Geometry File

• Steady Flow Data File and Plan

• Execution and View Results