- Flooding Hobbiton Part 3: What’s new in HEC-RAS 5.0.4
The HEC-RAS 3.0 Release Notes describes the new features and bug fixes in HEC-RAS 3.0. Download HEC-RAS 3.0 User Manual (PDF File) File Size: 3586792 bytes File Date: Thu Apr 19 23. The HEC-RAS User Manual is a detailed overview of the HEC-RAS 3.0. It provides a description of the major features found in HEC-RAS. Jul 22, 2019 HEC-RAS 5.0.6, HEC-RAS: Comprehensive software designed to help you perform one-dimensional hydraulic calculations for natural or constructed channels with the aid of graphs and reports, data storage and management options, RAS Mapper, as well as hydraul. May 10, 2017 HEC-RAS 5.0 now has a user interface that includes the RAS Mapper, which is used for 2D modeling. It is also possible to see the results in an interactive way. Here we will present the steps and needed considerations to model river/channel flow in HEC-RAS. This example consists on. Commonly used features of the HEC-RAS program quickly and with no prior knowledge of how the program operates. All of the features of the HEC-RAS program are covered in more detail in the program User’s Manual and the Hydraulic Reference Manual which may be downloaded from the following site.
Wrapping up our three-part coverage of the Great Hobbiton Flood, this article highlights some of the new features available in HEC-RAS 5.0.4, which was released on May 2, 2018.
[See our recent webinar recording for an overview of the new features or watch our instructional videos covering each feature separately!]
In this example, we’ll try out a few of the new tools:
- Culverts. First, we’ll see how the new culvert editor gets rid of the need for wormhole and C.O.U.S. culverts (RIP!) by allowing the inlet and outlet of each barrel to be defined by its own set of coordinates.
- Mesh Polygons. We’ll then add a “Refinement Region” to a 2D Flow Area using a new RAS Mapper tool that allows you to assign customised computational grid spacing with polygon features.
- Internal Boundary Conditions. Next we’ll add inflow hydrographs inside the 2D Flow Area as internal boundary conditions.
- Adjustable Time Steps. We’ll set Courant Number criteria to allow variable time steps to be selected based on computed velocities.
- Rating Curves. We’ll then run the model and generate rating curves in a single step (rather than having to extract flow and stage time series hydrographs separately and combine them in Excel).
- Speed Enhancements. Finally, we’ll compare run times to see how the speed improvements stack up.
Moving into 5.0.4
We’ll start with the Hobbiton model that we set up in our previous articles about saved views and comparing four culvert methods in HEC-RAS Version 5.0.3. If I want to pull that same model straight into the new version of HEC-RAS 5.0.4, there are a few cautions to look out for:
- When you take a project that was created in 5.0.3 and open it in 5.0.4, the mere act of opening RAS Mapper will affect some of the project files, even if you don’t save it. If you then go back to 5.0.3, your model may not behave the same way (or behave at all!) I would recommend making a copy of the entire 5.0.3 project folder first to avoid overwriting any files. [Hint: do not use “save as” since that tends to drop some settings and associations.]
- Keep in mind, you’ll have to open RAS Mapper before the model will even run in 5.0.4. (Sometimes you’ll also need to save, close, and re-open HEC-RAS to get it to run.) You’ll also have to re-set any legend adjustments as they all go back to the default at present.
- Any fence-sitting boundary condition lines that previously crossed an external 2D Flow Area perimeter will need to be adjusted; you’ll have to choose all in or all out.
Once you open a project in 5.0.4 and complete these steps, if you run a plan to completion, the very first thing you’ll probably notice is that it runs in about half the time. [But we can do much better than that as we’ll see below – stay tuned for some future articles on the basis for the speed enhancements!]
At first glance the model may appear to have run just fine; but if your previous model had wormhole culverts, you’ll see that they have simply been ignored. Here are some screen shots showing the results of my first run of the Hobbiton model in 5.0.4, with the “mega-cell” or Cell of Unusual Size culvert on the left, and the wormhole culvert on the right:
As we saw in the previous article about culvert methods in 5.0.3, the C.O.U.S. and wormhole results are supposed to be identical. The top image is from a time step when the flow has first arrived, passing freely through the mega-cell culvert but backed up behind the deck with the wormhole culvert. The bottom image is from a time step in which flow is still passing through the mega-cell culvert on the left but fills the area upstream of the roadway and overtops the deck with the wormhole culvert. In both instances, the images on the right show that the presence of the wormhole culvert has been completely ignored.
Coordi-culvert
In order to put the culvert back into the model, we’ll need to convert it to a “coordi-culvert” (or “coordivert” or whatever you want to call the new culverts in 5.0.4), with coordinates assigned to each barrel’s inlet and outlet.
I’ll start by deleting the wormhole culvert, and in its place I’ll draw an SA/2D Area Connection alignment along the roadway centerline (from left to right looking downstream). I’ll copy the terrain profile to the weir/embankment profile and add the culvert details. Download google chrome 69 mac. Here’s how it looks in the connection editor:
[Note the additional options that have been added to the left menu buttons.]
The culvert editor also looks a bit different in Version 5.0.4:
By clicking on “Individual Barrel Centerlines” the coordinates can be entered manually, or there is also a great new feature to import culvert centerlines from a shape file:
Here’s the schematic plan view for all four culverts, with the new “coordivert” swapped out for the wormhole culvert in the canal on the far right:
For the 1D model shown in the far left canal in the image above, for now we’re just importing the 1D reach that was originally created in the 5.0.3 geometry viewer, but if you wish to have a look at our instructional video (Part 1), you can follow along as we set up a 1D model from scratch entirely within RAS Mapper – no more GeoRAS needed! (although I must admit I’m a bit disappointed by a few of the missing GeoRAS capabilities in RAS Mapper such as automatically cutting cross sections at regular intervals and some reduced roughness functionality).
I’ll leave the standard 2D culverts and the mega-cell culverts as they were so we can check whether 5.0.4 handles them the same way as 5.0.3.
Now let’s get into a few of the other new enhancements in 5.0.4 before comparing results:
Mesh Polygons
First, I wanted to take advantage of the new refinement region feature. I dropped my overall mesh to a coarser 2-metre by 2-metre resolution. To generate a finer 1-metre by 1-metre mesh over a smaller area, I then added a refinement region in RAS Mapper using the edit tool. The next step is to right-click on the refinement region and select “Edit Refinement Region Properties” as shown here:
Now enter the cell spacing (in this case I used 1 metre by 1 metre). https://high-powerllc362.weebly.com/download-microsoft-remote-desktop-for-mac-yosemitte-10105.html.
With the higher resolution area defined, if you zoom in on the refinement region, you’ll see a more detailed computational mesh inside the 2D Flow Area:
This feature can save a substantial amount of computation time and prevents the need to create multiple 2D areas to reflect varying resolution requirements – or creating an excessive number of snaking breaklines with red-dot errors that need fixing! [See Part 2 of our instructional videos if you want to follow along as we create a model from scratch and add a refinement region.]
Internal Boundary Conditions
Just to show that it can be done in Version 5.0.4 now, I also entered the upstream BC lines as internal boundary conditions 500 metres inside the 2D mesh:
Keep in mind that flow will be able to travel in both directions from an internal BC Line. Here is an example with one of the inflow BC lines located right at the Hobbiton car park:
At this point flow can only be positive (can’t subtract flow to represent infiltration or a stormwater pit) but with Version 5.0.4 there isn’t any need to user the wormhole culvert hack to move flow around your 2D area anymore.
[See Parts 3 and 4 of our instructional videos if you want to follow along as we introduce internal boundary conditions.]
Adjustable Time Step Endnote x8 for mac download.
I had previously run the model with a constant computational time step of 0.5 seconds. I’ll take advantage of the new Courant Number criterion here by clicking on the button next to the time step:
Here’s the window with the new options (which is also accessible from the “Computation Options and Tolerances” dropdown):
With the adjusted time step selected, the model will increase or decrease the computational time step automatically based on the computed velocity.
[See Part 5 of our instructional videos if you want to follow along as we check the effect of variable time steps on model run time.]
Speed Enhancements
With each of those adjustments in place, I can now run the model in less than a quarter of the 5.0.3 time without any significant loss of accuracy. These results seem to be fairly typical of the improvements we’ve seen with other models. A simple, uniform channel actually takes longer to run in 5.0.4 but if your model has any complexity to it, you can typically cut run times in half just by moving a model from 5.0.3 into 5.0.4 with the same setup. For models that benefit significantly from refinement regions or adjustable time steps, the computational time requirements can be cut back even more significantly.
Results Comparison
The water surface elevation profile results in 5.0.4 look nearly identical to the results from 5.0.3. Again, the three 2D methods modelled in 5.0.4 come in very close to each other.
Here are the profiles zoomed in to the culvert location:
The upstream backwater profile is nearly identical between all three 2D methods, with some slight variation in the downstream outlet profile. If I go back and compare profiles between 5.0.3 and 5.0.4 using identical time steps, grid sizes, and geometries, some slight differences are still apparent in the main channel. If we simplify the comparison to include only the wormhole culvert in 5.0.3 and the coordivert in 5.0.4, the results show some interesting trends. Here are the profiles:
Here they are zoomed in to the culvert location:
What surprised me about these results is that there is more of a difference in the open channel flow locations outside of the influence of the culverts than there is in the immediate vicinity of the culverts. I understand there are some changes to culvert hydraulics in 5.0.4, but the changes don’t appear to have affected the simple case we’re working with here – at least not as much as they affected the uniform trapezoidal channel.
The differences are relatively small (0.1 metres out of a 2-metre depth), but in these open channel flow areas, the water surface elevation should essentially reflect the results of Mannings equation, so I expected the results to be a bit closer to each other in the uniform reach. In this case, all 1D results along with the 2D 5.0.3 results match Mannings equation spot on, while the 2D 5.0.4 results yield depths that are approximately 5% shallower than those predicted by Mannings equation. I’ll have to dig deeper into the computational differences to track down the source of the relevant change; in the meantime, here is a profile that subtracts the 5.0.3 profile from the 5.0.4 profile for each of the culvert configurations, with the roadway centerline shown at Chainage 300:
The 1D results are absolutely identical between versions, and the rest of the results show that (with the exception of one or two cells immediately adjacent to the bridge face) the differences near the culvert are less pronounced than the differences further from the culverts. Upstream and downstream of the extents shown in the profile above, the differences remain constant out to the external boundary condition locations.
Here is a plan view animation of the new coordi-culvert:
The coordivert results in 5.0.4 are effectively indistinguishable from the wormhole culvert results in 5.0.3, and the animations appear the same as in the previous article comparing culvert methods in 5.0.3. Stitching together RAS Mapper screen shots from wormhole culverts in Version 5.0.3 and coordi-culverts in Version 5.0.4, here’s how the results compare:
Again, the differences between wormhole culverts and coordinate culverts are not discernible. Although the standard culvert appears quite different from both the wormhole culvert and the coordi-culvert in plan view, the computed headwater and tailwater elevations are very similar. For this particular example, the results are all effectively the same; your decision on which method to use may depend on whether or not your bridge/roadway deck is included in your terrain data – and of course which version of HEC-RAS you’ll be running.
[Follow along with Part 6 of our instructional videos if you want to see how to import culvert barrel coordinates from a shape file.]
Rating Curves
One last feature I’ll hit in this article before closing is the ability to plot rating curves directly along any saved profile line with a single command. Just right-click on your saved profile line name and select “Rating Curve” as a new option under Time Series. Here’s where to find it in RAS Mapper:
See Part 7 of our instructional videos if you want to follow along as we automatically generate a rating curve.
[Caution: If you are going to use a rating curve to represent a gauge location, keep in mind that you’ll still need to use the methods outlined in our series of articles on generating rating curves in Version 5.0.3. To generate an accurate rating curve you’ll need to combine a time series stage hydrograph extracted from a single cell with a time series flow hydrograph extracted from a profile line that crosses through that cell. The new rating curve feature extracts both the stage and flow hydrographs from the profile line. In a 1D model, the stage hydrograph will be identical along an entire cross section (since the water surface elevation will be flat across the section by definition) but in a 2D model, every cell along the profile line can have a different stage hydrograph. The new tool simply averages the elevations across the profile, and can generate erroneous results, especially if overbank areas are represented by very large cells. The new tool should NOT be used with rain on grid models, since the stage will be artificially increased based on sheet flow areas outside of the channel.]
Closing the wormhole
Bottom line: with the release of 5.0.4, wormhole culverts have officially been retired – not just for long culverts, but for internal boundary conditions as well. Mega-cell culverts will still function but can also be retired for those who no longer wish to use them. From what we’ve seen so far, the new culverts provide equivalent results with much more functionality, so good riddance to both the worms and the Cells of Unusual S Sony. ize!
…And finally just for fun, let’s ramp up the flow and see if the Orc-dam can flood out Hobbiton with the help of our new canal:
THE GREAT FLOOD OF MIDDLE EARTH
This one might catch Frodo in a whirlpool!
https://profitstree303.weebly.com/nihon-kohden-tec-5631-user-manual.html. I hope this has been a helpful preview to see what’s new in 5.0.4!
If you are interested in being notified when future articles and instructional videos are published, please subscribe or contact us with any questions.
Krey Price
Surface Water Solutions
Surface Water Solutions
- Flooding Hobbiton Part 3: What’s new in HEC-RAS 5.0.4
Introduction to HEC-RAS
Center for Research in Water Resources
April 1999
Table of Contents
Goals of the Exercise
The primary goal of this exercise is to introduce you to channel flow using the HEC River Analysis System (HEC-RAS). By the end of this exercise, you should be able to:- Import and edit cross-sectional geometry data
- Import and edit flow data from HEC-HMS
- Perform a steady flow simulation
- View and analyze HEC-RAS output
Software and Data Requirements
The HEC-RAS program can be downloaded free of charge from the Hydrologic Engineering Center's home page at: http://www.wrc-hec.usace.army.mil/. A user's manual is also available at this location. The program runs on Windows 95 & 98, NT, and Unix platforms. This tutorial requires that you have running HEC-RAS version 2.2. The data required for the tutorial consist of HEC-RAS input files. These data can be downloaded from this website as the file hecras.zip. The files included are:- Waller.dss - HEC-HMS output time series data
- Waller.g01 - HEC-RAS geometry file
HEC-RAS Hydraulics
HEC-RAS is a one-dimensional steady flow hydraulic model designed to aid hydraulic engineers in channel flow analysis and floodplain determination. The results of the model can be applied in floodplain management and flood insurance studies. If you recall from hydraulics, steady flow describes conditions in which depth and velocity at a given channel location do not change with time. Gradually varied flow is characterized by minor changes in water depth and velocity from cross-section to cross-section. The primary procedure used by HEC-RAS to compute water surface profiles assumes a steady, gradually varied flow scenario, and is called the direct step method. The basic computational procedure is based on an iterative solution of the energy equation: , which states that the total energy (H) at any given location along the stream is the sum of potential energy (Z + Y) and kinetic energy (aV2/2g). The change in energy between two cross-sections is called head loss (hL). The energy equation parameters are illustrated in the following graphic:
Given the flow and water surface elevation at one cross-section, the goal of the direct step method is to compute the water surface elevation at the adjacent cross-section. Whether the computations proceed from upstream to downstream or vice versa, depends on the flow regime. The dimensionless Froude number (Fr) is used to characterize flow regime, where:
- Fr < 1 denotes subcritical flow
- Fr > 1 denotes supercritical flow
- Fr = 1 denotes critical flow
Starting a Project
You may start the HEC-RAS program by clicking Start/Programs/Hec/HEC-RAS 2.2. The following window should subsequently appear:Henceforth, this window will be referred to as the main project window. A Project in RAS refers to all of the data sets associated with a particular river system. To define a new project, select File/New Project to bring up the main project window:
You will first need to select your working directory, and then a title (Waller Creek), and file name (Waller.prj). All project filenames for HEC-RAS are assinged the extension '.prj'. Click on the OK button and a window will open confirming the information you just entered. Again click the OK button. The project line in your main project window should now be filled in. The Project Description line at the bottom of the main project window allows you to type a detailed name for the actual short Project name. If desired, you may click on the ellipsis to the right of the Description bar, and additional space for you to type a lengthy Description will appear. Any time you see an ellipsis in a window in HEC-RAS, it means you may access additional space for writing descriptive text.
For each HEC-RAS project, there are three required components--the Geometry data, Flow data, and Plan data. The Geometry data, for instance, consists of a description of the size, shape, and connectivity of stream cross-sections. Likewise, the Flow data contains discharge rates. Finally, Plan data contains information pertinent to the run specifications of the model, including a description of the flow regime. Each of these components is explored below individually.
Importing and Editing Geometric Data
The first of the components we will consider is the channel geometry. To analyze stream flow, HEC-RAS represents a stream channel and floodplain as a series of cross-sections along the channel. To create our geometric model of Waller Creek for example, we need to import the geometry file that you just downloaded. In HEC-RAS main project window, use File/Import HEC-RAS Data and choose the file Waller.g01. This HEC-RAS geometry file contains physical parameters describing Waller Creek cross-sections. To view the data, select Edit/Geometric Data from the project window.Hec Ras 5.0.3 Manual
The resulting view shows a schematic of Waller Creek from near Highland Mall to the Colorado River. This is the main geometric data editing window. The tick marks and corresponding numbers denote individual cross-sections. Choices under the View menu provide for zoom and pan tools. The six buttons on the left side of the screen are used to input and edit geometric data. The and buttons are used to create the reach schematic. A reach is simply a subsection of a river, and a junction occurs at the confluence of two rivers. Since our reach schematic is already defined, we have no need to use these buttons. The , , and buttons are used to input and edit geometric descriptions for cross-sections, and hydraulic structures such as bridges, culverts, and weirs. The allows you to associate an image file (photograph) with a particular cross-section. Click on the button to open the cross-section data window:
The data used to describe the cross-sections include the river station/cross-section number (32093 in the figure), lateral and elevation coordinates for each terrain point (station & elevation columns), Manning's roughness coefficients (nVal), reach lengths between adjacent cross-sections, left and right bank station, and channel contraction and expansion coefficients. These data are typically obtained by field surveys. The buttons can be used to toggle between different cross-sections. Use them to scroll to cross-section 26780. To edit data, simply double-click on the field of interest. As an example, double-click on station 779, change the value to 778, and hit the enter key. You may notice that this action caused all of the the data fields to turn red and it enabled the 'Apply Data' button. Whenever you see input data colored red in HEC-RAS, it means that you are in edit mode. There are two ways to leave the edit mode (you can do whichever you like):
- Click the 'Apply Data' button. The data fields will turn black, indicating you're out of edit mode, and the data changes are applied.
- Select Edit/Undo Editing. You'll leave the edit mode without changing any of the data.
The cross-section points appear black and bank stations are denoted with red. Manning roughness coefficients appear across the top of the plot. Again, the buttons can be used to maneuver between different cross-sections. Sap treasury configuration and end user manual. Any solid black areas occuring in a cross-section represent blocked obstructions. These are areas in the cross-section through which no flow can occur. Some cross-sections contain green arrows and gray areas. This symbolism is indicative of the presence of a bridge or culvert. Input data and plots specifically associated with bridges and culverts can be accessed from the main geometric data editor window by clicking on the button. Take a little time to familiarize yourself with the geometric data by flipping through some different cross-sections and bridges/culverts. When you are finished, return to the geometric editor window and select File/Save Geometric Data. Return to the main project window using File/Exit Geometry Data Editor. At this point, save your HEC-RAS project just in case the program crashes for some reason or another.
Importing and Editing Flow Data
Enter the flow editor using Edit/Steady Flow Data from the main project window. Instead of importing an existing HEC-RAS flow file, we'll use stream flow output from an HEC-HMS model run similar to the one completed for the Introduction to HMS Exercise. The resulting flows are based on the 100-year design storm on Waller Creek, between its junction with the Hemphill Branch, and the Colorado River. Output data from the HEC-HMS model are stored in files with a .dss extension. DSS stands for the HEC Data Storage System, which is essentially a database for storing time-series information. To use these data, select File/Set Locations for DSS Connections from the main flow data window. To open the DSS file, click on the button and select the Waller.dss file from your working directory. https://yourselfskyey109.weebly.com/revo-uninstaller-pro-serial-key-generator.html. The window should now look like this:
The DSS data are stored in table records, each one representing a 24-hour increment of time-series flow data. Each record is described by several parameters, some of which are shown in the columns titled Part A, Part B, etc., as follows:
Column | Description |
A | ???? |
B | HMS hydrologic element (subbasin, junction, etc.) identifier |
C | Flow type (baseflow, floodflow) |
D | Date |
E | Model Time Step |
F | HMS Run ID |
HEC-RAS allows you to view the hydrograph of any DSS record. Since the highest flows for our model run occur on February 1, we'll concentrate on the data from this day. Click on any record with Column C = FLOW and Column D = 01FEB1999 and then click on to see the associated hydrograph:
The coordinates of the cursor (time,flow rate) are displayed in the bottom right corner of the plot. Gridlines can be shown by invoking the Options/Grid menu item.
Exit the plot window and return to the 'Set Locations for DSS Connections' window. We're now going to link the HEC-RAS cross-sections with their calculated DSS flows from HEC-HMS. The following table shows the relationship between the junctions in the HEC-HMS basin model and cross-sections in the HEC-RAS geometry file:
HEC-HMS Junction | HEC-RAS Cross-Section |
Junction with Hemphill Branch | 12609 |
MLK Blvd | 8916 |
15th Street | 7089 |
7th Street | 3591 |
1st Street | 1157 |
Colorado River | 0 |
The procedure for linking the DSS records with their associated cross-sections is as follows:
- Choose the river station from the drop-down list
- Click on the button 'Add selected location to table'
- Click on the DSS record in which the Part B corresponds to the selected cross-section. Ensure that Part B column reads 'FLOW' and Part C says '01FEB1999'. Click on 'Select DSS Pathname' to link the data.
- Repeat for each of the junctions (click OK when finished with all junctions).
After the DSS records for the six junctions have been set, return to the main steady flow data window and select File/DSS Import. Fill in the fields as shown below:
Click on the 'Import Data' button, and the flows from HEC-HMS will be imported into your HEC-RAS model.
As discussed earlier, the direct step method uses a known water surface elevation (and several hydraulic parameters) to calculate the water surface elevation at an adjacent cross-section. We'll assume a subcritical flow regime for our model, so the computations will begin at the downstream end. As such, the water surface elevation at the downstream boundary must be known. To establish this value, click on the button from the steady flow data window. HEC-RAS allows the user to set the water surface elevation boundary condition by four methods:
- Known water surface - based on observed data
- Critical depth - the program will calculate critical depth
- Normal depth - the program will calculate normal depth
- Rating curve - elevation determined from an existing stage-discharge relationship curve
Click OK to return to the main steady flow window. You'll notice that each of the junctions have now been assigned peak flow values from the HMS DSS output. For cross-sections falling between HMS junctions, the flow value of the upstream junction is applied. However, the most upstream cross-section, number 32093, hasn't been assigned a flow value. You will need to input a number here, but its magnitude is really inconsequential because the computations will proceed from downstream to upstream (subcritical flow). And for this tutorial, we are mainly interested in water surface profiles between U.T. and the Colorado River. Input a value of 2700. All of the required flow parameters have now been entered into the model! From the file menu, select Save Flow Data and save the flow data under the name '100 year flows.' To leave the flow data editor and return to the HEC-RAS project window, choose File/Exit Flow Data Editor.
Executing the Model
With the geometry and flow files established, the HEC-RAS model can be executed. Select Simulate/ Steady Flow Analysis from the project window. But before running the model, one final step is required: definition of a plan. The plan specifies the geometry and flow files to be used in the simulation. To define a plan, select File/New Plan. You'll be subsequently asked to provide a plan title and a 12 character short identifier. To execute the model, first ensure that the flow regime radio button is set to 'Subcritical' and then click the compute button. All of the HEC-RAS windows you've used to this point are simply graphical user interfaces used to input data for the model. The computations are actually performed by a FORTRAN program named SNET. Clicking the compute button starts SNET and opens a DOS window that shows the progress of the simulation. When the computations are complete, the PROGRAM TERMINATED NORMALLY message should appear.
Dismiss the DOS window by clicking the X in the upper right corner.
Viewing the Results
There are several methods available with which to view HEC-RAS output, including cross-section profiles, perspective plots, and data tables. From the project window, select View/Cross-Sections. The cross-section view is similar to the one shown when we edited the cross-section data. However, the output view also shows the elevation of the total energy head line (shown in the legend as 'EG Peak Flows'), the water surface ('WS Peak Flows'), and critical depth ('Crit Peak Flows'). As with the cross-section geometry editor, you can use the to scroll to other cross-sections. For a profile of the entire reach, select View/Water Surface Profiles from the project window.
Using the Options/Zoom In menu option, you can focus on a particular stretch of reach to see how the water surface relates to structures in the channel such as bridges. Other available options for graphical display of output data include plots of velocity distribution (View/Cross-Sections/Options/Velocity Distribution) and pseudo 3D plots (View/X-Y-Z Perspective Plots). Spend a little time playing around with some of the display options.
For hydraulic design, it is often useful to know the calculated values of various hydraulic parameters. HEC-RAS offers numerous options for tabular output data display. From project window, choose View/ Cross Section Table.
The resulting table includes a number of hydraulic parameters, including water surface elevation, head losses, and cross-sectional area. At the bottom of the window, error and notes (if any) resulting from the steady flow computations are shown. As you scroll through the cross-sections, take a look at some of the error messages. For our model, it looks like the primary areas of concern is too few cross-sections. Additional tabular output data can be accessed from the invoking View/Profile Table from the main project window. Numerous formats and data types can be viewed by selecting different tables from the Std. Tables menu.
Cleaning Up
Welcome to the end of what I hope gave you more of an insight to hydraulic river modeling. Go ahead and close HEC-RAS by selecting Exit from the File menu in the main project window. If you're working from a temp directory, it would be a good idea to delete your files.Hec-ras 5.0.6 User Manual Software
Download flash tool for mac. Return to Eric Tate's home page