This document provides a tutorial for using HEC-RAS software to create flood inundation maps. It explains how to open and explore an existing HEC-RAS model for the Wabash and Tippecanoe Rivers, run steady flow simulations by specifying boundary conditions and flow data, visualize water surface profiles and results, and create flood inundation maps by overlaying water depth results on topography in RAS Mapper. The overall goal is to demonstrate the workflow and key steps in using HEC-RAS to model river hydraulics and map flood hazards.
1. The document discusses flood plain mapping of the Jamuna River in Bangladesh using HEC-RAS and GIS software.
2. Steady flow water surface profiles were computed for 10 different discharges and flood plains were delineated for discharges of 500 cumecs, 10000 cumecs, and 30000 cumecs.
3. The results show flood risk for various discharges which will help engineers and designers make accurate decisions to protect against flooding.
This document provides a tutorial on using HEC-GeoRAS, ArcGIS, and HEC-RAS to create flood inundation maps for steady and unsteady flow conditions. It discusses the software and data requirements, and provides step-by-step instructions for preprocessing data in HEC-GeoRAS and ArcGIS, running HEC-RAS simulations, and postprocessing the results to create flood extent polygons. The tutorial demonstrates the full workflow for both 1D steady state and 1D unsteady simulations.
Scripts have been developed to facilitate two-way exchange of geometric and hydraulic data between GRASS GIS and the Hec-RAS hydraulic model. The scripts allow extracting cross-sections from a DEM and exporting them to Hec-RAS via a standard text file format. Additional data like riverbanks and levees can be included. After hydraulic simulation in Hec-RAS, water level results can be imported back into GRASS GIS for flood risk mapping and analysis. The open source workflow provides an alternative to proprietary tools and allows processing of high-resolution data directly in GRASS for hydraulic modeling.
This tutorial document provides instructions for using HEC-GeoRAS to preprocess and postprocess geospatial data for flood inundation mapping in HEC-RAS. It describes how to setup the analysis environment in ArcGIS, create geospatial layers representing river geometry like the centerline, banks, and cross-sections. It also provides step-by-step guidance on populating these layers with data and exporting it to create the HEC-RAS geometry file. The tutorial uses sample data for a fictional Baxter River to demonstrate the HEC-GeoRAS workflow in ArcGIS.
Tutorial of the free tool ARAS that automates HEC-RAS. The tool proved to be very useful for advanced studies such as optimization or uncertrainty.
tss.vraag@gmail.com
HEC-RAS is a computer program developed by the U.S. Army Corps of Engineers that is used for modeling water flow through open channels and computing water surface profiles. It can model one-dimensional steady and unsteady flow and is capable of modeling subcritical, supercritical, and mixed flow regimes. HEC-RAS finds application in floodplain management and flood insurance studies to evaluate floodway encroachments and is also used for bridge and culvert design, dam breach analysis, and channel modification studies.
This document provides release notes for version 5.0.5 of HEC-RAS (River Analysis System), including a list of bugs fixed from the previous version. Several new features were added in version 5.0.4, such as improved computational speed, variable time step capabilities, and enhanced 2D modeling tools. Version 5.0.5 addresses 7 bugs identified in version 5.0.4 related to Manning's n values, map rendering, lateral structure connections, and time step controls. Installation instructions and a list of all bugs addressed in prior versions are also included.
1. The document discusses flood plain mapping of the Jamuna River in Bangladesh using HEC-RAS and GIS software.
2. Steady flow water surface profiles were computed for 10 different discharges and flood plains were delineated for discharges of 500 cumecs, 10000 cumecs, and 30000 cumecs.
3. The results show flood risk for various discharges which will help engineers and designers make accurate decisions to protect against flooding.
This document provides a tutorial on using HEC-GeoRAS, ArcGIS, and HEC-RAS to create flood inundation maps for steady and unsteady flow conditions. It discusses the software and data requirements, and provides step-by-step instructions for preprocessing data in HEC-GeoRAS and ArcGIS, running HEC-RAS simulations, and postprocessing the results to create flood extent polygons. The tutorial demonstrates the full workflow for both 1D steady state and 1D unsteady simulations.
Scripts have been developed to facilitate two-way exchange of geometric and hydraulic data between GRASS GIS and the Hec-RAS hydraulic model. The scripts allow extracting cross-sections from a DEM and exporting them to Hec-RAS via a standard text file format. Additional data like riverbanks and levees can be included. After hydraulic simulation in Hec-RAS, water level results can be imported back into GRASS GIS for flood risk mapping and analysis. The open source workflow provides an alternative to proprietary tools and allows processing of high-resolution data directly in GRASS for hydraulic modeling.
This tutorial document provides instructions for using HEC-GeoRAS to preprocess and postprocess geospatial data for flood inundation mapping in HEC-RAS. It describes how to setup the analysis environment in ArcGIS, create geospatial layers representing river geometry like the centerline, banks, and cross-sections. It also provides step-by-step guidance on populating these layers with data and exporting it to create the HEC-RAS geometry file. The tutorial uses sample data for a fictional Baxter River to demonstrate the HEC-GeoRAS workflow in ArcGIS.
Tutorial of the free tool ARAS that automates HEC-RAS. The tool proved to be very useful for advanced studies such as optimization or uncertrainty.
tss.vraag@gmail.com
HEC-RAS is a computer program developed by the U.S. Army Corps of Engineers that is used for modeling water flow through open channels and computing water surface profiles. It can model one-dimensional steady and unsteady flow and is capable of modeling subcritical, supercritical, and mixed flow regimes. HEC-RAS finds application in floodplain management and flood insurance studies to evaluate floodway encroachments and is also used for bridge and culvert design, dam breach analysis, and channel modification studies.
This document provides release notes for version 5.0.5 of HEC-RAS (River Analysis System), including a list of bugs fixed from the previous version. Several new features were added in version 5.0.4, such as improved computational speed, variable time step capabilities, and enhanced 2D modeling tools. Version 5.0.5 addresses 7 bugs identified in version 5.0.4 related to Manning's n values, map rendering, lateral structure connections, and time step controls. Installation instructions and a list of all bugs addressed in prior versions are also included.
TELEMAC is hydrodynamic modeling software that can:
1. Solve the shallow water equations using finite element or finite volume methods on an unstructured triangular grid.
2. Perform simulations of free surface flows, accounting for effects like turbulence, temperature/salinity gradients, and dry areas.
3. Include pre- and post-processing tools for generating grids, visualizing results, and exchanging data with GIS software.
1. This document provides step-by-step instructions for setting up a SWAT model using ArcSWAT. It describes how to delineate a watershed, create subbasins and HRUs, generate weather and other input files, run the SWAT simulation, and plot model output.
2. Key steps include watershed delineation using DEM and land use data, calculating subbasin parameters, defining HRUs based on land use, soils, and slope thresholds, generating weather and other input files from internal or observed data, running the SWAT simulation
This document provides a tutorial on using HEC-RAS (Hydraulic Engineering Center's River Analysis System), a 1D step-backwater hydraulic modeling software, to model flow through a small laboratory flume. It describes how to set up a new HEC-RAS project, define the flume geometry by adding cross sections, interpolate cross sections, add steady flow data at three discharges, define the downstream boundary condition as critical depth, run the steady flow simulation, and view the resulting water surface profiles. The tutorial demonstrates the basic workflow for creating a simple HEC-RAS model to simulate subcritical flow through a rectangular flume with uniform cross-sectional geometry.
ASFPM 2016: Applications of 2D Surface flow Modeling in the New HEC-RAS Versi...CDM Smith
Derek Etkin presented "Applications of 2D Surface flow Modeling in the New HEC-RAS Version 5.0" at the 2016 Association of State Floodplain Managers conference.
seminar report of " Introduction to HEC RAS "ankit jain
This document provides an overview of the capabilities of the Hydrologic Engineering Center's River Analysis System (HEC-RAS) software. HEC-RAS allows for one-dimensional steady and unsteady flow river hydraulics calculations, sediment transport modeling, and water temperature analysis. The software includes components for steady flow water surface profiles, unsteady flow simulation, sediment transport, and water quality analysis. It also features a graphical user interface, data management capabilities, and reporting tools. The seminar report discusses HEC-RAS functionality in more detail.
HEC-RAS is a computer program that models the hydraulics of water flow through natural rivers and other channels. The program is one-dimensional, meaning that there is no direct modeling of the hydraulic effect of cross section shape changes, bends, and other two- and three-dimensional aspects of flow. The program was developed by the US Department of Defense, Army Corps of Engineers in order to manage the rivers, harbors, and other public works under their jurisdiction; it has found wide acceptance by many others since its public release in 1995.
Using HEC-RAS to assess flash floods risk in arid regionsAhmed Saleh, Ph.D
Explain the utilization of HEC-RAS to two-dimensional simulation of flood wave propagation. also, show the application of ArcGis to draw flood risk maps.
This document provides instructions for a GIS exercise involving spatial analysis of elevation and precipitation data. The goals are to calculate average watershed elevation and precipitation for subwatersheds of the San Marcos River basin. Slope, aspect, flow direction and hydrologic slope will first be calculated from a sample digital elevation model to demonstrate spatial analysis tools in ArcGIS. A ModelBuilder model is then created to automate these calculations. Finally, the model is applied to real elevation data for the San Marcos basin watersheds to calculate average elevation and interpolate precipitation from station data to estimate watershed precipitation volumes and runoff ratios.
Roughness Variable for RAS, allows an easy way to update manning values of all cross sections of a HEC RAS project. Moreover, it allows to assign one different values to each cross section
Surpac is the world’s most popular geology and mine planning software used for ore body evaluation, open pit and u/g mine design.It provides tools for geological modelling, surveying, and mine planning.
This document discusses using Python scripting to automate and control river flow and sediment transport simulations performed with the HEC-RAS software. It presents three examples: 1) Running a basic steady flow simulation from a Python script, 2) Automatically calibrating roughness coefficients using an optimization algorithm, and 3) Controlling a sediment transport simulation by accessing sediment data files and simulation results. The techniques allow for more sophisticated modeling approaches like sensitivity analysis, automatic calibration, and probabilistic modeling.
This document discusses using Python scripting to automate and control river flow and sediment transport simulations performed with the HEC-RAS software. It presents three examples: 1) Running a basic steady flow simulation from a Python script, 2) Automatically calibrating roughness coefficients using an optimization algorithm, and 3) Controlling a sediment transport simulation by accessing sediment data files and simulation results. The techniques allow for more sophisticated analyses like sensitivity analysis, automatic calibration, and probabilistic modeling.
This document describes applying 1D and 2D hydraulic modeling to analyze a split flow loop network using HEC-RAS 5.0 Beta software. It first created a 1D steady-state model with multiple reaches and junctions to represent the loop network. It then modeled the system using a combined 1D/2D approach with 2D flow areas defined from LiDAR terrain data. The document discusses challenges of split flow modeling and benefits of the 2D approach for variable water surface elevations. It also demonstrates particle tracking visualization to analyze flow paths through the floodplain during large events.
1. The document describes steps for hydrological modeling using GIS, including generating a DEM from contour lines, filling sinks, computing flow direction and accumulation, delineating stream networks and catchments, and performing terrain analysis within catchments.
2. Key steps are generating a DEM for Kigali City from contours, filling sinks in the DEM, computing flow direction and accumulation rasters, delineating stream networks using a threshold on accumulation, and delineating catchments based on pour points.
3. Within catchments, the document describes extracting the DEM clip, calculating slope, reclassifying slope into categories, creating a TIN, and generating a hillshade for visualization.
APPLICATION OF 1-D HEC-RAS MODEL IN DESIGN OF CHANNELSAM Publications
Flood occurs at Surat city frequently due to sudden release of water from Ukai dam in river Tapi. At the
time of floods in river Tapi, Surat city and surrounding regions are most affected. The city has faced many floods
since long back. Major flood event occurred in the year 1883, 1884, 1942,1944,1945,1949, 1959, 1968, 1994, 1998,
2002, 2006, 2007 and 2012. The carrying capacity of river is approximately about 4.5 lakhs cusecs (12753 cumecs) at
present. In this, stability of a segment of lower reach approximately 6 km length of Tapi river between Weir cum
causeway and Sardar bridge is evaluated for its carrying capacity and stability in response to discharge and slopes
using HEC-RAS software for past flood data. The study reach consists of 24 cross-sections. The hydraulics model,
HEC-RAS is employed to evaluate flood conveyance performance and also uniform flow computation is carried out.
In the present study existing storm drains are not only marked but based on the HEC-RAS water surface elevation
computation for various flood discharges, need of flood gates on the storm drains are also assessed. The
recommendations are done based on this study either to increase height of bank or construct a retaining wall at
certain sections along the study reach. The present study also recommends installations of flood gates on all the storm
drain outlets which are without flood gates. The width of river in no case be encroached as sections are sensitive high
floods.
This document discusses using HEC-RAS software to analyze a river reach containing a single bridge. It outlines the input data needed, including geometric data and flow data. It then describes the steps to model the bridge, including adding the bridge, defining the geometry, and selecting modeling approaches. The document compares results from modeling the bridge as a pressure/weir and using the energy method. It notes that adjustments to contraction/expansion coefficients and cross section locations can improve results.
This document provides an applications guide for using the HEC-RAS software (River Analysis System) developed by the US Army Corps of Engineers. HEC-RAS allows users to perform one-dimensional steady and unsteady flow calculations for river hydraulics. It contains tools for geometric data input, steady/unsteady flow simulation, and output/results analysis. The guide walks through examples of various hydraulic models and simulations that can be performed using HEC-RAS, including bridges, culverts, floodways, and more.
Laminar flow over backward-facing step (2D) simulationHayderJawadKadhim
Is to simulate a laminar flow over a backward-facing step and
Give some insight into the influence of the grid density and
Order of the spatial discretization.
This document describes the 7 main steps to create a watershed from SRTM DEM data using ArcGIS software: 1) Create a DEM from SRTM data and reproject it; 2) Remove sinks in the DEM; 3) Generate a flow direction raster; 4) Generate a flow accumulation raster; 5) Generate a stream channel raster; 6) Generate stream links; and 7) Generate the watershed polygons. Each step involves using different ArcGIS hydrology tools on the output of the previous step to delineate watershed boundaries.
This document provides an overview of a presentation on using the HEC-RAS hydraulic modeling software for managers. It discusses the benefits of understanding hydraulic modeling including for planning, risk reduction, and environmental assessments. It also outlines the agenda which will define key hydraulic and modeling concepts, explain what HEC-RAS is and what it can be used for, what is needed to use it, concerns for managers, and where to find help. The presentation will provide managers with a basic understanding of HEC-RAS and its uses.
Flutter is a popular open source, cross-platform framework developed by Google. In this webinar we'll explore Flutter and its architecture, delve into the Flutter Embedder and Flutter’s Dart language, discover how to leverage Flutter for embedded device development, learn about Automotive Grade Linux (AGL) and its consortium and understand the rationale behind AGL's choice of Flutter for next-gen IVI systems. Don’t miss this opportunity to discover whether Flutter is right for your project.
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TELEMAC is hydrodynamic modeling software that can:
1. Solve the shallow water equations using finite element or finite volume methods on an unstructured triangular grid.
2. Perform simulations of free surface flows, accounting for effects like turbulence, temperature/salinity gradients, and dry areas.
3. Include pre- and post-processing tools for generating grids, visualizing results, and exchanging data with GIS software.
1. This document provides step-by-step instructions for setting up a SWAT model using ArcSWAT. It describes how to delineate a watershed, create subbasins and HRUs, generate weather and other input files, run the SWAT simulation, and plot model output.
2. Key steps include watershed delineation using DEM and land use data, calculating subbasin parameters, defining HRUs based on land use, soils, and slope thresholds, generating weather and other input files from internal or observed data, running the SWAT simulation
This document provides a tutorial on using HEC-RAS (Hydraulic Engineering Center's River Analysis System), a 1D step-backwater hydraulic modeling software, to model flow through a small laboratory flume. It describes how to set up a new HEC-RAS project, define the flume geometry by adding cross sections, interpolate cross sections, add steady flow data at three discharges, define the downstream boundary condition as critical depth, run the steady flow simulation, and view the resulting water surface profiles. The tutorial demonstrates the basic workflow for creating a simple HEC-RAS model to simulate subcritical flow through a rectangular flume with uniform cross-sectional geometry.
ASFPM 2016: Applications of 2D Surface flow Modeling in the New HEC-RAS Versi...CDM Smith
Derek Etkin presented "Applications of 2D Surface flow Modeling in the New HEC-RAS Version 5.0" at the 2016 Association of State Floodplain Managers conference.
seminar report of " Introduction to HEC RAS "ankit jain
This document provides an overview of the capabilities of the Hydrologic Engineering Center's River Analysis System (HEC-RAS) software. HEC-RAS allows for one-dimensional steady and unsteady flow river hydraulics calculations, sediment transport modeling, and water temperature analysis. The software includes components for steady flow water surface profiles, unsteady flow simulation, sediment transport, and water quality analysis. It also features a graphical user interface, data management capabilities, and reporting tools. The seminar report discusses HEC-RAS functionality in more detail.
HEC-RAS is a computer program that models the hydraulics of water flow through natural rivers and other channels. The program is one-dimensional, meaning that there is no direct modeling of the hydraulic effect of cross section shape changes, bends, and other two- and three-dimensional aspects of flow. The program was developed by the US Department of Defense, Army Corps of Engineers in order to manage the rivers, harbors, and other public works under their jurisdiction; it has found wide acceptance by many others since its public release in 1995.
Using HEC-RAS to assess flash floods risk in arid regionsAhmed Saleh, Ph.D
Explain the utilization of HEC-RAS to two-dimensional simulation of flood wave propagation. also, show the application of ArcGis to draw flood risk maps.
This document provides instructions for a GIS exercise involving spatial analysis of elevation and precipitation data. The goals are to calculate average watershed elevation and precipitation for subwatersheds of the San Marcos River basin. Slope, aspect, flow direction and hydrologic slope will first be calculated from a sample digital elevation model to demonstrate spatial analysis tools in ArcGIS. A ModelBuilder model is then created to automate these calculations. Finally, the model is applied to real elevation data for the San Marcos basin watersheds to calculate average elevation and interpolate precipitation from station data to estimate watershed precipitation volumes and runoff ratios.
Roughness Variable for RAS, allows an easy way to update manning values of all cross sections of a HEC RAS project. Moreover, it allows to assign one different values to each cross section
Surpac is the world’s most popular geology and mine planning software used for ore body evaluation, open pit and u/g mine design.It provides tools for geological modelling, surveying, and mine planning.
This document discusses using Python scripting to automate and control river flow and sediment transport simulations performed with the HEC-RAS software. It presents three examples: 1) Running a basic steady flow simulation from a Python script, 2) Automatically calibrating roughness coefficients using an optimization algorithm, and 3) Controlling a sediment transport simulation by accessing sediment data files and simulation results. The techniques allow for more sophisticated modeling approaches like sensitivity analysis, automatic calibration, and probabilistic modeling.
This document discusses using Python scripting to automate and control river flow and sediment transport simulations performed with the HEC-RAS software. It presents three examples: 1) Running a basic steady flow simulation from a Python script, 2) Automatically calibrating roughness coefficients using an optimization algorithm, and 3) Controlling a sediment transport simulation by accessing sediment data files and simulation results. The techniques allow for more sophisticated analyses like sensitivity analysis, automatic calibration, and probabilistic modeling.
This document describes applying 1D and 2D hydraulic modeling to analyze a split flow loop network using HEC-RAS 5.0 Beta software. It first created a 1D steady-state model with multiple reaches and junctions to represent the loop network. It then modeled the system using a combined 1D/2D approach with 2D flow areas defined from LiDAR terrain data. The document discusses challenges of split flow modeling and benefits of the 2D approach for variable water surface elevations. It also demonstrates particle tracking visualization to analyze flow paths through the floodplain during large events.
1. The document describes steps for hydrological modeling using GIS, including generating a DEM from contour lines, filling sinks, computing flow direction and accumulation, delineating stream networks and catchments, and performing terrain analysis within catchments.
2. Key steps are generating a DEM for Kigali City from contours, filling sinks in the DEM, computing flow direction and accumulation rasters, delineating stream networks using a threshold on accumulation, and delineating catchments based on pour points.
3. Within catchments, the document describes extracting the DEM clip, calculating slope, reclassifying slope into categories, creating a TIN, and generating a hillshade for visualization.
APPLICATION OF 1-D HEC-RAS MODEL IN DESIGN OF CHANNELSAM Publications
Flood occurs at Surat city frequently due to sudden release of water from Ukai dam in river Tapi. At the
time of floods in river Tapi, Surat city and surrounding regions are most affected. The city has faced many floods
since long back. Major flood event occurred in the year 1883, 1884, 1942,1944,1945,1949, 1959, 1968, 1994, 1998,
2002, 2006, 2007 and 2012. The carrying capacity of river is approximately about 4.5 lakhs cusecs (12753 cumecs) at
present. In this, stability of a segment of lower reach approximately 6 km length of Tapi river between Weir cum
causeway and Sardar bridge is evaluated for its carrying capacity and stability in response to discharge and slopes
using HEC-RAS software for past flood data. The study reach consists of 24 cross-sections. The hydraulics model,
HEC-RAS is employed to evaluate flood conveyance performance and also uniform flow computation is carried out.
In the present study existing storm drains are not only marked but based on the HEC-RAS water surface elevation
computation for various flood discharges, need of flood gates on the storm drains are also assessed. The
recommendations are done based on this study either to increase height of bank or construct a retaining wall at
certain sections along the study reach. The present study also recommends installations of flood gates on all the storm
drain outlets which are without flood gates. The width of river in no case be encroached as sections are sensitive high
floods.
This document discusses using HEC-RAS software to analyze a river reach containing a single bridge. It outlines the input data needed, including geometric data and flow data. It then describes the steps to model the bridge, including adding the bridge, defining the geometry, and selecting modeling approaches. The document compares results from modeling the bridge as a pressure/weir and using the energy method. It notes that adjustments to contraction/expansion coefficients and cross section locations can improve results.
This document provides an applications guide for using the HEC-RAS software (River Analysis System) developed by the US Army Corps of Engineers. HEC-RAS allows users to perform one-dimensional steady and unsteady flow calculations for river hydraulics. It contains tools for geometric data input, steady/unsteady flow simulation, and output/results analysis. The guide walks through examples of various hydraulic models and simulations that can be performed using HEC-RAS, including bridges, culverts, floodways, and more.
Laminar flow over backward-facing step (2D) simulationHayderJawadKadhim
Is to simulate a laminar flow over a backward-facing step and
Give some insight into the influence of the grid density and
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This document describes the 7 main steps to create a watershed from SRTM DEM data using ArcGIS software: 1) Create a DEM from SRTM data and reproject it; 2) Remove sinks in the DEM; 3) Generate a flow direction raster; 4) Generate a flow accumulation raster; 5) Generate a stream channel raster; 6) Generate stream links; and 7) Generate the watershed polygons. Each step involves using different ArcGIS hydrology tools on the output of the previous step to delineate watershed boundaries.
This document provides an overview of a presentation on using the HEC-RAS hydraulic modeling software for managers. It discusses the benefits of understanding hydraulic modeling including for planning, risk reduction, and environmental assessments. It also outlines the agenda which will define key hydraulic and modeling concepts, explain what HEC-RAS is and what it can be used for, what is needed to use it, concerns for managers, and where to find help. The presentation will provide managers with a basic understanding of HEC-RAS and its uses.
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Flood Hazards Unit 4: HEC-RAS Tutorial for Flood Inundation
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Venkatesh Merwade (Purdue University), Jim McNamara (Boise State University), and Diana Krupnik (UNAVCO
USIP Intern)
HEC-RAS is the Hydrologic Engineering Center-River Analysis System. This is a free software
package with a graphical user interface that can be used to run hydraulic simulations and create
flood inundation maps for a river system. In this example, we will use a LIDAR-derived digital
elevation model (DEM) to create the flood inundation model for Wabash-Tippecanoe. This
tutorial explains the steps involved in running a HEC-RAS model and using its results to create
flood inundation maps for the given area.
Software Requirements
You must have a computer with HEC-RAS version 5.0.3 or higher. The latest version of HEC-
RAS can be downloaded from the link below:
https://www.hec.usace.army.mil/software/hec-ras/download.aspx
Once downloaded, install HEC-RAS on your windows computer. If you own a Mac computer,
there are a few ways to install HEC-RAS on your Mac. One option is to first install Windows on
your Mac using Boot Camp and then install HEC-RAS. You can find more information on this
on the Apple support page: https://support.apple.com/boot-camp. If you do not want to go the
Boot Camp route, you can explore more options provided here: https://kb.iu.edu/d/ahjj.
Data Requirements
The key data required to create a hydraulic model is the terrain data (TIN or DEM or surveyed
cross-sections). Additional datasets that may be useful are aerial photograph (s) and land use
information. The dataset supplied to you includes a small portion of the Wabash River and its
tributary, the Tippecanoe River, located in Indiana, US. This dataset is created from the LIDAR
data collected for this area by the Indiana Department of Natural Resources.
Get the zip file and copy it on your local drive. Unzip its contents in your working folder. It
contains the terrain (LIDAR DEM) for the study area and the HEC-RAS model.
Getting Started
Start HEC-RAS from the Start menu by clicking on Start >> HEC-RAS 5.0.5. The following
window should open.
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Next, Click on File Open Project.
Navigate to your working folder on the right pane, select Wabash_Tippecanoe.prj file (HEC-RAS
project file) and click OK to open the project.
You will see that the HEC-RAS interface is filled with the information related to this project.
A HEC-RAS model or project will have a geometry file (information related to river length, cross-
sections, Manning; n value and structures), a flow data file (information related to the flow or
discharge for running the simulation) and a plan file that contains information about the input and
output files associated with a HEC-RAS model or project.
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RAS Mapper
RAS Mapper is a GIS interface within HEC-RAS for creating the geometry and visualizing results.
For this model, the geometry has already been created, and you can look at that by going to GIS
ToolsRAS Mapper to open the mapping interface as shown below.
You will see that the river centerline, bank lines, cross-sections and flow paths are defined for this
model. If you want to learn how to get LIDAR data into HEC-RAS and digitize the geometry in
RAS Mapper, you can refer to HEC RAS Model Development Tutorial listed at the end of this
handout. After exploring the RAS Mapper, you can close it by going to FileExit.
HEC-RAS Geometry
In the RAS Mapper interface, you saw how the lines were digitized. How this information is
actually represented and used in HEC-RAS can be examined by using the Geometry Data editor.
In the HEC-RAS window, click on Edit >> Geometric Data…
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You will see the schematic of all the lines. If you click on the Cross-Section button on the left, you
will be able to browse and see all the cross-sections in the model by selecting the river, reach and
station as shown below.
You can also look at the Manning’s n roughness coefficient for all cross-sections at once by
going to TablesManning’s n or k values (horizontally varied). You can look at individual
reach or all reaches by selecting all Rivers as shown below.
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In the above figure, n#1 represents the LOB(left over bank), n#2 represents the main channel and
n#3 represents the ROB (right over bank). You can also edit/change Manning’s n values for a
single cross-section by changing any individual row. If you want to change the values for all
cross-sections, you can select the column and change the values by using the Set Values option..
If you are done with exploring the geometry data, you can close the geometry editor by going to
FileExit Geometry Data Editor, or just use the X at the right corner of the interface.
Steady Flow Data and Boundary Conditions
Boundary conditions, including the flow values, needed for hydraulic simulations are specified in
HEC-RAS using the flow data editor. You can open the flow data editor by going to
EditSteady Flow data on the HEC-RAS interface.
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By default, the interface will have on empty column to provide upstream boundary condition,
flow values, for each reach in the model. A single flow value will create one water surface
profile along the reach. To input multiple flow values, you can just increase the number of
profiles corresponding to the flow values. You will use the values provided in Table 1 to create
profiles corresponding to different return periods. All values are provided in cfs for Wabash and
Tippecanoe. Change the number of profiles to 4 and input the flow for each profile in the empty
column (e.g.. 2 year flow for PF1, 10 year flow for PF2,..and 100 year flow for PF4). If you want
you can also first run for just one profile, see the results and then add more profiles.
Table 1
Return
Period (T)
Tippecanoe River
at Confluence
Wabash
Downstream
Wabash
Upstream
2 3246 12201 8955
10 5582 20731 15149
50 11165 41463 30298
100 33985 125485 91500
Similarly, the downstream boundary condition can be specified by using the Reach Boundary
Condition button highlighted on the above interface. The only downstream condition that we
need is for the most downstream reach because the stage at the junction will serve as the
boundary condition for the two upstream reaches. This condition has already been specified in
the model so you do not have to change anything. We are using the normal depth boundary
condition with a channel slope of 0.2%. Close the flow data editor. You will use the same
downstream boundary condition for all simulations so do not change this again.
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Save the flow data by going to fileSave.
Running Steady Flow Simulation
After making sure that all boundary conditions are specified, you are now ready to run a
simulation. Go to RunSteady Flow Analysis and run the model under sub-critical condition by
clicking the Compute button.
Close the window after the simulation is completed successfully.
Visualizing HEC-RAS Results
HEC-RAS results can be visualized in multiple ways. First, the water surface in each cross-
section can be viewed by going to ViewCross-sections, and then you can browse through any
cross-section along a selected River/Reach as shown below.
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The water surface profile of an entire reach can be visualized by using the ViewWater Surface
Profiles option.
A perspective (3D) view of one or multiple reaches can be viewed by using the View XYZ
Perspective plots as shown below.
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You can also look at the tabular results to see the water surface elevation, water width, velocity,
etc. for all cross-sections by going to ViewProfile Summary Table.. by default, the program
will show results for on reach as shown below:
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If you are interested in looking at the results for all reaches in one table, in the profile output
table window, go to OptionsReaches and select all reaches.
Flood Inundation Mapping
The view options described above are give information only on the water surface elevation.
Whether this water surface will inundation any floodplain will depend on the elevation in the
floodplain. To get the actual water depth in the river channel and the floodplain, the water
surface must be overlaid on the topography. This can be done using RAS Mapper.
Open RAS Mapper from the main HEC-RAS window. In the Data Layer Window (left pane), you
will see that under the Results group, there are new layers namely Plan 02 (the number might be
different). Under Plan 02, there are four more groups namely Geometry, Depth, Velocity and WSE.
Click on the Depth layer. Make sure the box next to it is checked. The inundation depths will
appear as shown below. The profile corresponding to the depths are shown beside the Depth layer.
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You can toggle between the different profiles using the slider at the top of the window.
You can also change the profiles by right clicking on the Depth layer >> Edit Map Parameters.
Select the profile under Steady Profile and click on Save Map.
If you need to view a different output, right click on Plan 02 and click on Add New Result Map
Layer. The same form as shown above opens. Select the variable under Map Type, select the profile
under Steady Profile, and click on Save Map. A new layer is created. Right click on the new layer
and click on Compute/Update Stored Map and the new variable will be mapped in the Display
Window.
(Note: Only those variables are mapped that have been calculated under 1D steady state condition.
Some of the variables may not be for 1D steady state flow and may not be mapped onto the Display
Window!)
Once the depth is mapped, you must check the inundated region for its quality. You will have to
look at the inundation map and the underlying terrain to correct errors in the flood inundation map.
Sometimes you will realize (at the end!) that your terrain has errors, which you need to fix in the
HEC-RAS geometry file. The refinement of flood inundation results to create a hydraulically
correct output is not covered in this tutorial - this is an iterative process requiring several iterations
in HEC-RAS. The ability to judge the quality of terrain and flood inundation map comes with the
knowledge of the study area and experience.
Getting the Area of the Flood Inundation Extent
Right click on the WSE or the Depth layer corresponding to your profile, and select Edit Map
Parameters as shown below:
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In the Results Map Parameter window, select the Inundation Boundary corresponding to your
profile (for e.g., PF1 below), name the boundary with an appropriate name (e.g., Inundation
Boundary_100 for 100 year flow), and push the Save Map button as shown below.
A Inundation Boundary polygon layer will then be added to the RAS Mapper. Right click on the
boundary polygon layer and open the attribute table as shown below (if you do not see the Open
attribute table option, select the Compute/Update Stored Map option in the same properties
window and try again):
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The area attribute will give you the area corresponding to this inundation boundary polygon in
the units that are used in the RAS Mapper. If you do not know the spatial coordinates or the units
for your RAS Mapper, go to Tools and select the “Set Projection for the Project” option so see
the projection and the units. Convert your area to appropriate units for reporting (for e.g., 10 km2
is expected instead of 10,000,000 m2
)
Exporting Flood Inundation Extent Polygon as Shapefile or KML File
The inundation boundary polygon can be exported to a shapefile or KML file for opening it in
any other GIS interface. To export, right click on the boundary polygon layer, and select the
Export Layer option as shown below:
Select the format and save the file in your working directory.
Adding more layers such as aerial image or land cover to RAS Mapper
The Tools menu in RAS Mapper enables addition of more layers to the map for visual overlay.
Save the RAS Mapper and the HEC-RAS project. Congratulations, you have successfully finished
the RAS Mapper tutorial!
Additional Resources
Tutorial to create 1D HEC-RAS model using RAS Mapper
http://web.ics.purdue.edu/~vmerwade/education/rasmapper.pdf