The Hydrologic Engineering Center's River Analysis System 4.0.0
           (Now With Sediment Transport Capabilities)


WRCS has been an authorized vendor of, and a beta tester for, the US Army Corps of Engineers' HEC-RAS program. The HEC-RAS program is the first of the US Army Corps of Engineers Next Generation (NexGen) engineering software packages to be released. This water surface profiles program replaces the HEC-2 backwater, the UNET Unsteady Flow, and will eventually replace the HEC-6 erosion and sedimentation programs. The program will import HEC-2 input data files and perform a hydraulics analysis yielding the same results as the HEC-2 and UNET models.

HEC-RAS operates under the Windows NT, Me, XP or Windows 95, 98 or 2000 environments. HEC-RAS provides state-of-the-art GUI graphics for both input and output (including pseudo 3-D channel plots). The program offers major advances in user friendliness over the old MS-DOS HEC-2 format, and has context-sensitive help screens for all program features and options.

HEC-RAS will perform advanced modeling options such as multiple methods for bridge and culvert analysis, channel improvements and floodway computations, as well as most of the unsteady flow analysis capabilities of the Corps' UNET program. HEC-RAS's sediment transport capabilities are currently under development and will eventually replace  the HEC-6 program. In addition, many HEC-2 and HEC-RAS (Vers. 1, 2 and 3) modeling options have been augmented, and new capabilities added, to the latest release of the HEC-RAS program:

Click on These Screen Shots to View:

                              

  • Sediment Transport/Movable Bed Modeling
  • Sediment Impact Analysis Methods (SIAM)
  • Water Quality Capabilities (Temperature Modeling)
  • User Defined Rules for Controlling Gate Operations
  • Modeling Pressurized Pipe Flow
  • Geometric model schematic can be placed over background maps and incorporate clickable scanned images of structures
  • Mixed flow regime analysis, allowing analysis of both sub- and super-critical flow regimes in a single computer run
  • Culvert and bridge routines, allowing for multiple openings of different types and sizes, including routines for elliptical, arch, and semi-circular culverts
  • Bridge scour computations following FHA Publication HEC-18
  • Inline weirs and gated spillways analysis, including both radial and sluice type gates and Ogee, broad and sharp crested weirs
  • Tributary/diversion flow network capabilities, allowing for fully looped river system analysis in which reaches can be subdivided and combined
  • Quasi 2-D velocity distributions
  • X-Y-Z (pseudo 3-D) graphics of the river system.
  • Import and export of GIS and CAD data
  • Floating pier debris can be modeled
  • New bridge design editor has been added to the model
  • New graphical cross section editor has been added to the model

    Unsteady Flow Routing features include:

    1. Dam Break Analysis
    2. Levee Breaching
    3. Mixed Flow Regime For Unsteady Flow
    4. Pump Stations
    5. Navigation Dams
    6. Culvert Flap Gates
    7. Floodway Encroachments
    8. Flow Data and Boundary Conditions Features
      1. Internal River Station Initial Stages
      2. Minimum Flow and Flow Ratio Table
      3. Observed (Measured) Data
    1. Initial Conditions Flow Optimization
    2. Log File Output
    3. Unsteady Flow Data Editor
    4. Unsteady Flow Simulation Manager
    5. Geometric Pre-Processor (HTAB)
    6. Output Post-Processor
    7. Stage and Flow Hydrograph Plots
    8. Graphics Animation
    9. HEC-2 and UNET Data Deck Importers

    Geometric Data Features:

    1. Background Map Viewing for River System Schematic
    2. Inline and Lateral Structures and Storage Area Connections
    3. Interface to GIS (GeoRAS)
    4. Flow and Seasonal Roughness Factors Stored in Geometry
    5. Display of Information on The River System Schematic
    6. Data Editing Tables For Geometric Editor
    7. Data Manipulation Tools For Geometric Editor
    8. Lateral weirs and gated spillways
    9. Lateral rating curves
    10. Storage areas
    11. Hydraulic Connections
    12. Cross Section Points Filter
    13. CONSPAN Culvert Shape
    14. Buried Culverts
    15. Multiple Manning's n Values in Culverts
    16. Sediment Elevations Within Cross Sections
    17. Pilot Channels
    18. Permanent Ineffective Flow Areas
    19. Bridge Skew
    20. Split Flow Optimization

Hydraulic Design Functions:

  1. Uniform Flow Computations
  2. Stable Channel Design Tool
  3. Sediment Transport Capacity for each cross section

Help System and Manuals:

  1. Context Sensitive Online Help System
  2. PDF Manuals Online
  3. Custom Help Files

Graphical and Tabular Output

  1. Cross-Section Plots
  2. Profile Plot
  3. Rating Curve Plot
  4. Hydrograph Plots
  5. 3-D Graphics
  6. Hydraulic Tables Plot (HTAB)
  7. Detailed Output Tables
  8. Summary Output Tables
  9. DSS Viewer

Download a copy of the HEC-RAS Version 4.0.0 Release Notes for all the details on the new capabilities and bug fixes in Version 4.0.0.

HEC-GeoRAS for ArcView


HEC-GeoRAS is an ArcView GIS extension specifically designed to process geo-spatial data for use with the Hydrologic Engineering Center River Analysis System (HEC-RAS). The extension allows users with limited GIS experience to create an HEC-RAS import file containing geometric attribute data from an existing digital terrain model (DTM) and complementary data sets. Results exported from HEC-RAS may also be processed. 

HEC-GeoRAS is a set of procedures, tools, and utilities for processing geospatial data in ArcView GIS (or ArcInfo) using a graphical user interface (GUI). The interface allows the preparation of geometric data for import into HEC-RAS and processes simulation results exported from HEC-RAS. To create the import file, the user must have an existing digital terrain model (DTM) of the river system in the ArcInfo TIN format. The user creates a series of line themes pertinent to developing geometric data for HEC-RAS. The themes created are the Stream Centerline, Flow Path Centerlines (optional), Main Channel Banks (optional), and Cross Section Cut Lines referred to as the RAS Themes. 

Additional RAS Themes may be created/used to extract additional geometric data for import in HEC-RAS. These themes include Land Use, Levee Alignment, Ineffective Flow Areas, and Storage Areas. 

Water surface profile data and velocity data exported from HEC-RAS simulations may be processed by HEC-GeoRAS for GIS analysis for floodplain mapping, flood damage computations, ecosystem restoration, and flood warning response and preparedness. 

The  HEC-GeoRAS software includes the following new features: 

  1. XS Plot Tool
  2. Ineffective Flow Areas Theme
  3. Levee Alignment Theme
  4. Storage Areas Theme
  5. Water Surface Profile Results Processing

HEC-GeoRAS is now included on the HEC-RAS, HEC-Combo Pack or HEC-Works CDs (including the Users Manual in PDF format) at no additional cost. 

Ship or Download the Disks or CD and Manuals
The full HEC-RAS program, including HEC-GeoRAS, is available for only $35 on CD.  If you don't need the HEC-GeoRAS add-on and are willing to download the program, you can save $10 plus shipping, for a total cost of just $25!  The CD version comes with a free copy of HEC-2, and full documentation on CD. For download orders you will be given download instructions upon receipt of payment.

PRICES:

See our Order Form for details.

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