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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The area with positive results meaning water surface is higher than the terrain is flood area, and the area with negative results is dry. The River Auto Name function assigns names to river segments.
If you have an existing shapefile or feature class with a set of points that you would like to use instead of interactively creating points, you can do so by using the following guidelines:.
Right click on the menu bar to pop up the context menu showing available tools and check the Arc Hydro Tools to add the toolbar to the map document. After digitizing, save the edits and tutoriaal editing. When you used the profile tool earlier to view the cross-section profile, the program used the underlying terrain to extract the elevations along the cutline. The output is Drainage Point with the default name DrainagePoint that can be overwritten.
This will create ProjectPoint and ProjectArea feature classes. You can also look at the log file and make sure there are no errors in the data by scrolling to the bottom of the log file as shown below:.
Step by Step: Flood Hazard Mapping
Again, to be consistent, looking downstream first digitize the left flowpath followed by the right flowpath for each reach. This could be replaced by other soil data e. Save your edits, stop the Editor, and save the hutorial document. Open the attribute table of Catchment. This function copies all the project specific files that you have created.
For each catchment that is not a head catchment, a polygon representing the whole upstream area draining to its inlet point is constructed and stored in a feature class that has an Adjoint Catchment tag. If you want to split the sub-basin at the point displayed in the map, you can use the subbasin divide tool, and click at the point displayed on the map.
The preparation of soil data is done at this point. Since we used aerial photograph while defining the crosssections, our job of locating the bridge is done. 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:. The output is the Catchment Grid layer.
The Basin Centroid tool will create a Centroid point feature class to store the centroid of each sub-basin. Creating Bridges and Culverts After creating cross-sections, the next step is to define bridges, culverts and other structure along the river.
You should now see the Arc Hydro toolbar added to ArcMap. You now have a very useful dataset for use in several hydrologic models and studies. We will approximate the bridge width to about ft station todeck elevation as 84 ft high chord and 6ft deep low chord as shown below:.
Create a new empty map. Merging soil and land use data.
Step by Step: Flood Hazard Mapping | UN-SPIDER Knowledge Portal
Accept the default 20 map units for Rasterization Cell Size. As multiples HMS basin models can be developed by using the same spatial data, these models are managed by defining two feature classes: The cell size of dtmgrid is equal to the Rasterization Cell Size you chose in the layer setup window.
The flow path defines the path of flow from the selected point to the outlet of the catchment following the steepest descent. DEM Reconditioning The function needs as input a raw DEM and a linear feature class like the river network that both have to be present in the map document. Click on Bridge Design buttonand enter the information as shown below:.
In the Optional Layers tab, make sure the layers that are empty are set to Null. Browse to your working folder for Output Directory.
Use the Sketch tool to define the blocked obstruction, save edits and stop editing. Subwatersheds delineated from a set of hma 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.
The BatchDone and SnapOn options can be used to turn on select 1 or off select 0 the batch processing and stream snapping for that point.
Even if we did not create a gage file, there will be a gage file created when the met model file is created.
Obstructions represent blocked flow areas areas with no water and no flow. This process may take several minutes for a large grid! This is useful for exporting the schematic to other models or programs without loosing the geospatial information.
Sometimes you will realize at the end! Zoom-in to the network and click tutorisl mouse along the drainage line to create your point yutorial interest. The raster data are stored in a sub folder with the project name CedarCreek inside CedarCreek folder. This function populates the BasinLag tutorixl in the tutorail feature class with numbers that represent basin lag time in hours. Notice that each catchment has a HydroID assigned that is the unique identifier of each catchment within Arc Hydro.
For merging basins, we follow the process that allow us to merges two or more adjacent basins into one. In the next window, choose English units default from the drop-down menu, and click OK.
This tells ArcHydro that the batch processing is done. Arc Hydro toolbar also provides an extensive set of tools for delineating hmw and subwatersheds.