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Lonnie Anderson, P.E., CFM

Course Length: 1 Hour 

Purpose and Background 

Floodplain analysis is one of the primary functions of the U.S. Army Corps of Engineers Hydrologic Engineering Center's HEC-RAS software program.  RAS Mapper allows the modeler to quickly view floodplain extents without using another GIS or CADD program.  The modeler can more easily identify issues with model results and know where to make improvements.

Visualization of hydraulic results is extremely useful for model review and presentation to clients and for reports and submittals.  RAS Mapper allows for the display of water surface elevations (traditional floodplain mapping), floodplain depths, floodplain boundary and flow velocities. This allows for very specialized presentation of hydraulic results for almost every type of hydraulic analysis.

This webinar focuses on a more in-depth look at the use of RAS Mapper within HEC-RAS.  The webinar provides a discussion on the use of RAS Mapper and not the hydraulic analysis features of the software.  Emphasis is be placed on input and working with the RAS Mapper function. Participants who wish to attend this webinar must be well-versed in using the HEC-RAS program and GIS software.

Primary Discussion Topics

  • Differences in RAS Mapper between HEC-RAS V4.1 and V5.0
  • RAS Mapper basics and data layers
  • Terrain processing
  • Using hydraulic results to view floodplain extents
  • Mapping other hydraulic variables

Learning Outcomes

  • Learn how to add terrain, shapefiles and web imagery within HEC-RAS directly
  • Learn how to add landuse roughness factors for use in 2D modeling
  • Efficiently map floodplain results
  • Analyze output for reasonableness
  • Generate floodplain, floodway, depth grids and base flood elevation mappings for use in various CADD software

Webinar Benefits

  • Learn differences between HEC-RAS 4.1 and 5.0 versions of RAS Mapper
  • Learn how to efficiently map flooding depths, velocities, flood extents and floodway limits
  • Aid user in transition to using 2D tools available in HEC-RAS 5.0

Intended Audience

  • Civil engineers seeking to gain knowledge on the RAS Mapper feature of HEC-RAS.

Webinar Outline

  • RAS Mapper V4.1 quick overview of basics
  • RAS Mapper V5.0 changes and advances
  • Importing background data
  • Terrain processing
  • Incorporating proposed conditions terrain into model
  • Flood extents results output mapping to CADD software
  • Mapping other hydraulic variables