What is profile in HEC-RAS?

HEC-RAS Mapper has the option for user to draw a line on the map, give that line a name, then use that line to plot whatever results are turned on underneath the line. The line can be drawn as a multi-point line anywhere on the map. Once the line is drawn you will be asked to give it a unique name.

What is a RAS model?

Reliability, availability and serviceability, a computer hardware engineering term originally used by IBM. John Zaller’s “Receive-Accept-Sample” model, propounded in his book The Nature and Origins of Mass Opinion.

What is a HEC-RAS model?

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.

How do you add a levee to HEC-RAS?

HEC‑RAS Levee Behavior A simple way to do this is to set a levee station and elevation that is above the existing ground. If a levee elevation is placed above the existing geometry of the cross section, then a vertical wall is placed at that station up to the defined levee elevation.

How do you view water surface profile in HEC RAS?

To display the analysis output results in a profile plot, select Results | Profile Plot from the ribbon menu. Selecting this menu command will display the HEC‑RAS analysis results in a profile plot.

What is critical water surface elevation?

The critical water surface elevation is the elevation for which the total energy head is a minimum (i.e., minimum specific energy for that cross section for the given flow). In certain situations it is possible to have more than one minimum on the total energy curve.

What is Ras Mapper?

A three-dimensional plot of multiple cross-sections is also provided. Inundation mapping is accomplished in the HEC-RAS Mapper portion of the software. Inundation maps can also be animated, and contain multiple background layers (terrain, aerial photography, etc…). Tabular output is available.

What is the use of HEC-RAS?

HEC-RAS is a computer program for modeling water flowing through systems of open channels and computing water surface profiles. HEC-RAS finds particular commercial application in floodplain management and [flood insurance] studies to evaluate floodway encroachments.

Is HEC-RAS 2D free?

HEC-RAS has been developed for the U.S. Army Corps of Engineers (USACE). Use is not restricted and individuals outside of USACE may use the program without charge. HEC will not provide user assistance or support for this software to non-USACE users.

Is HEC-RAS A numerical model?

HEC-RAS solution has numerical oscillations, which is a characteristic feature of any standard implicit scheme.

What is levee in HEC-RAS?

Levee overtopping and breaching can be analyzed within HEC-RAS by modeling the levee as a lateral structure. The lateral structure (levee) can be connected to a 2D Flow Area, a storage area, or another river reach.

How do I create a cross section in HEC-RAS?

Open Hec/Ras, Under File-New Project, create new project. Enter cross sectional data; click on Edit/Enter geometric data. Click on River Reach-add a new river reach to the schematic: sketch river and name the river and reach. Click on Cross Section-Edit and/or create cross sections and add cross sectional data.

How do I generate a profile plot from a HEC-RAS model?

From the Forecast Runs Detail section, select an HEC-RAS model alternative ( Russian River Real-Time ), from the Forecast tabs, click Reports. Click Profile Plot, the Profile Plot dialog ( Figure 5) opens. The Profile Plot displays the water surface profile for the first reach (routing) in the river system.

How do I view hydraulic properties in HEC RAS?

Hydraulic Properties Tables From the Modeling Module, the hydraulic properties tables can be viewed for the selected HEC-RAS model alternative. The Hydraulic Properties Table (Figure 12) allows you to view the computed curves after the Hydraulic Table parameters have been entered for the cross section and structures.

What is an HEC-RAS model alternative?

From an HEC-RAS model alternative you have a series of reports, that provide you with results for key variables; distribution of flow (left and right overbank, main channel); steady flow results; unsteady flow results; rating curves; and, much more.

How do I exit an unsteady flow HEC-RAS model?

See the HEC-RAS User’s Manual for more information. From the File menu, click Exit, and the Profile Plot closes. From the Modeling Module, the results from an unsteady flow HEC-RAS model alternative are the same as those available in HEC-RAS. For a complete listing of HEC-RAS results se the HEC-RAS User’s Manual.