- Hec ras xs points filter tood for free#
- Hec ras xs points filter tood how to#
- Hec ras xs points filter tood verification#
Open ArcMap and load the “Tuolumne.mxd” file previously created. Now we will now return to HEC-GeoRAS to delineate the extent of the flooding. A “” file will be created in our working directory. Leave the rest of the parameters as default.Ĭlick on “Export Data” button. To export the data to ArcGIS click on File > Export GIS Data… in the HEC-RAS main window. Assessment of the quality of the simulation comes with the knowledge of the study area and experience.Īfter the computation is finished, we will export the results to ArcGIS to delineate the inundation extent.
Hec ras xs points filter tood verification#
An actual hydraulic simulation requires the verification of results, identification of possible errors in the data and, if necessary, repetition of calculations. Please note that this is a very simple example for educational purposes only.
The number of points can be reduced with the XS Points Filter Tool (geometric data window > Tools > Cross section point filter…). We have to take into account that the maximum number of station-elevation points is 500. Select the Subcritical Flow Regime, and click on “Compute”. Name it “TuolumneMeadows.p01” and “100year” for the short ID. In the HEC-RAS main window, click on Run > Steady Flow Analysis... Click on File > New Plan. Save the flow data as “TuolumneMeadows.f01”. To learn more about boundary conditions in HEC-RAS, check chapter 3 of the Hydraulic Reference Manual.Ĭlick OK. Energy losses are evaluated by friction and contraction – expansion coeficients. The basic computational procedure of HEC-RAS for steady flow is based on the solution of the one-dimensional energy equation. To define downstream conditions, click on “Reach Boundary Conditions”, select “Downstream” for Toulumne River, click on Normal Depth, and enter 0.001. We now define flow conditions upstream for steady flow (Edit > Steady Flow Data). Enter 1 for number of profiles, and click on “Apply Data”. In our case, we are going to define one profile that represents the peak discharge at the most upstream location of the Tuolumne River for a 100 year return period.ġ00-year flows were assessed from a frequency analysis of the nearest gauging station data (1127479 Tuolumne River at Grand Canyon of Tuolumne), with the maximum discharge being 200 cubic meters per second (7060 cubic feet per second). In HEC RAS every flow to be simulated is called a profile. The next step is entering Flow Data and Boundary Conditions. Save the geometry data and close the geometric editor. Click on the “Bridge Design” button and enter the information as shown below:Ĭlose the bridge/culvert editor. The first bridge (RS=5360.882) has three piers and the second (RS=4123.291) has only one. The result should look something like this: Enter the data for the deck hight and low chords height as shown in the next picture:Ĭlick on the “Copy US to DS” button to copy the information from upstream to downstream, and click OK. Click on Deck/Roadway editor, and delete all information. We see that, in both cases, the deck elevation is not accurate.
In our case, we have two bridges at river stations RS=5360.882 and RS=4123.291. Click on “Bridge/Culvert” editing button. The next step is to edit the structures data (bridges). We can use the editor to move bank stations, change the distribution of Manning’s n, add or delete ground points, etc. To check the quality of the imported data, we can use the graphical cross-section editor (Tools > Graphical Cross-section Edit) in the geometric data editor. Save the geometry file as “TuolumneGeometry” (File > Save Geometry Data). Data will be imported into the HEC-RAS geometry editor. Finally, in the last window (Cross Sections and IB Nodes), make sure all Import Data boxes are checked for cross-sections and click OK.Ĭlick on Finished-Import Data. In the second window (River Reach Stream Lines), make sure all import stream lines boxes are checked, and click Next. In the first window (Intro), confirm SI (metric) units. Browse to “” file previously created in HEC-GeoRAS, and click OK.
Next, click on File > Import Geometry Data > GIS Format. To import the GIS data into HEC-RAS, first go to the geometric data editor (Edit > Geometric Data…) Go to File > Save Project As… Save it as “TuolumneMeadows.prj”
Hec ras xs points filter tood for free#
The latest version of HEC-RAS can be downloaded for free from the Hydraulic Engineering Center of the U.S. Launch the HEC-RAS program (Start > Programs > HEC > HEC-RAS > HEC-RAS 4.1.0). It 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. HEC-RAS is a program that models the hydraulics of water flow through natural rivers and other channels.
Hec ras xs points filter tood how to#
After a long break, today we will see how to import the preprocessing data generated in part 1 of this tutorial into the HEC-RAS hydraulic model.