Uncertainty analysis of HEC-HMS model using the GLUE method for flash flood. CEE Engineering Hydrology HEC-HMS Bare Essentials Tutorial and Example comprehensive or to replace the HEC-HMS documentation; rather it is a. The Hydrologic Modeling System (HEC-HMS) is designed to simulate the complete hydrologic processes of dendritic watershed systems.
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Now label the flowpaths by using the Assign LineType button. You will see that two folders: Structures can be identified by using the aerial photograph provided with the tutorial dataset. In the next window, provide the following inputs: After successful simulation, close the computation window and the steady flow window.
Select the River Profile tooland click on any river segment that you are interested in inspecting. Since we ran the model with three profiles, we can choose which profile we would like to export. If you get an error, you will need to modify geometry or flow data based on error messages to run the simulation successfully.
You can check the RiverLen field in the input River1 or whatever name you have for your input river feature class is populated. We will assume twelve 10 ft wide piers with a spacing of ft. After digitizing, save the edits and stop editing. For this tutorial we will run the model in steady state condition. Fill in the fields Name and Description – both are string fields.
Click on the outlet grid cell at the watershed outlet as shown below: Label all flow paths, and confirm this by opening the attribute table of the Flowpaths feature class. Finally, verify the tables and Click OK. Save your HMS project. Skip to main content. The output is the Flow Direction Grid, named by default Fdr. This function converts the input Stream Link grid into a Drainage Line feature class.
Step by Step: Flood Hazard Mapping
This will add a point for the watershed outlet in the ProjectPoint feature class. Since we have only one bridge, we will edit its information tutodial details such tutoriql deck elevation and number of piers are usually not exported by HEC-GeoRAS. Since you left the UserElev box unchecked there are no values in this field.
Terrain Preprocessing – Raster Data. For this exercise, choose 25 km 2 as the threshold area, and click OK. To create the channel centerline in Banks feature classstart editing, and choose Create New Feature as the Task, and Banks as the Target as shown below:.
Step by Step: Flood Hazard Mapping | UN-SPIDER Knowledge Portal
The preparation of soil data is done at this point. This function creates a grid of stream segments that have a unique identification. Subwatersheds delineated from a set of points are therefore by definition non overlapping because the watershed draining to a point that is within another watershed is excluded from the subwatershed of the downstream point.
A new map data frame with the analysis name Steady Flow will be added to ArcMap with the terrain data. The new watershed is stored in the Watershed feature class and another feature class named WatershedPoint is also added to the map. Each catchment also has its Length and Area attributes.
Entering Flow data and boundary conditions. We will skip parameters associated with computing rainfall as these numbers should come from detailed analysis of the watershed. For this exercise we will choose the one with maximum flow PF3and accept the default export options.
A new feature class storing longest flow path for each sub-basin is created as shown below:. In the next heec, provide the following inputs:.
HEC-HMS Exercise for CEK at University of Texas at Austin
So create a field named LandUse type: We do not have any meteorologic data temperaturerainfall etc at this point. The position of ineffective areas will be stored in a new table named IneffectivePositions.
Towards the end of the section 6. Cat is its default name that can be overwritten by the user.
The ability to judge the quality of terrain and flood inundation polygon comes with the knowledge of the study area and experience. This function populates the BasinLag field in the subbasin feature class with numbers that represent basin lag time in hours.
Save edits, and stop editing. The Fill Sinks function modifies the elevation value to eliminate these problems.
Browse to your working folder for Output Directory. After the inundation map is created, you must check the inundation polygon for its quality. This could be replaced by other soil data e. The River Slope tool computes the slope of the river segments and stores them in Slp field. Adjust the symbology of the Flow Accumulation layer Fac to a multiplicatively increasing scale to illustrate the increase of flow accumulation as one descends into tutorixl grid flow network. The grid is added with a unique symbology assigned to cells having identical numbers as you can see below:.
This process will create two tugorial Confirm that the name of the batch point feature class is BatchPoint. Both are Integer type you can check the field properties of BatchPoint. The cells in Str grid with a value of 1 are symbolized with black color to get a stream network as shown below: