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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You can specify the methods that HMS should use for transform rainfall to runoff and routing channel routing using this function.
HMS Project This tutorrial copies all the project specific files that you have created. Zoom-in to the network and click the mouse along the drainage line to create your point of interest. The output is the Catchment Grid layer. Choose the lookup parameter as Curve Number which is default in the next window, Click OK, and then select the inputs for the next window as shown below:.
Creating bank lines is similar to creating the channel centerline, but there are no specific guidelines with regard to line orientation and connectivity – they can be digitized either along the flow direction or against the flow direction, nms may be continuous or broken. Confirm cross-sections data, make sure all Import Data boxes are checked for crosssections, and click OK accept default values for matching tolerance, round places, etc.
This is useful for exporting the schematic to other models or programs without loosing the geospatial information. Select Characteristics Basin Centroid. This function fills the sinks in a grid. Close the attribute table, and save the map document.
On the other hand, watersheds may overlap For example, the two watersheds in the Watershed feature class overlap with each other.
Step by Step: Flood Hazard Mapping | UN-SPIDER Knowledge Portal
You can check it is PolylineZ by opening its attribute table. Let us first start with river centerline.
Each line in the feature class carries the identifier of the catchment in which it resides. Add wshslopepct hc slope for watershed grid to the map document.
This Str grid contains a value of “1” for all the cells in the input flow accumulation grid Fac that have a value greater than the given threshold as shown in above figure. Preparing Soil data for CN Grid. This will create ProjectPoint and ProjectArea feature classes.
HEC-HMS Exercise for CEK at University of Texas at Austin
This process may take several minutes for a large grid! Catchment Grid file name: Leave the other options unchanged.
For example, buildings in the floodplain and levees are tutorail obstructions. After the reaches are digitized, the next task is to name them. Creating ineffective flow areas. Merging of Soil and Land Use Data.
When snapping is turned on, if your point is sufficiently near to a drainage line within around 5 grid cells then the point will be snapped i. This feature class is used to speed up the point delineation process.
Step by Step: Flood Hazard Mapping
The centroid elevation update may be needed when none of the basin centroid methods center of gravity or longest flow path provide satisfactory results, and it becomes necessary to edit the Centroid feature class and move the centroids to a more reasonable location manually. The processing of land use data for preparing curve number grid is now done. Since these layers are empty, our task is to populate some or all of these layers depending on our project needs, and then create a HEC-RAS geometry file.
The output is Adjoint Catchment, with a default name AdjointCatchment that can be overwritten.
A point is then created at the location of mouse click, and the following form is displayed:. Confirm the input feature class for River, and click OK. Then select the Minimize Area Change tab at the bottom, and enter for the number of points to trim cross-sections down to.
This discussion is beyond the scope of this exercise. Zoom-in to the most upstream part of the ceedar creek tributaries.
Save the ArcMap document. 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 ArcCatalog-view of the data folder is shown below: You can check this by right-clicking on the data frame and looking at its properties.