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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This version of HecGeoHMS apparently gives error with river connectivity even if the rivers are well connected. The quality of the results by the two methods is a function of the shape of the sub basin and should be evaluated after they are generated. Click OK, and a polygon feature class named AdjointCatchment is added to the map.
This function delineates the watershed upstream of each point in an input Batch Point feature class. This tool will verify all the input datasets. Eventually, we are going to use these land use classes and soil group type, in conjunction with runoff curve numbers CNto create the curve number grid.
This function allows generating the drainage points associated to the catchments.
Typically, you will have thtorial modify meteorologic and basin files to reflect field conditions before actually running the HMS model. You will notice that only a few cross-sections had points removal.
Upon successful completion of the process, the linear feature class DrainageLine is added to the map. The output is the stream link grid, with the default name StrLnk that can be overwritten. Before we proceed, let us deal with rows for SoilCode field.
HEC-HMS Exercise for CEK at University of Texas at Austin
As a result of this merging, we now have 12 sub-basins and 15 river segments in the project. This function captures the geographic information x,y of the subbasin boundaries and stream alignments in a text file that can be read and displayed within HMS.
The Basin Centroid tool will create a Centroid point feature class to store hex centroid of each sub-basin. The Muskingum method is added to RouteMet field in the River feature class.
To digitize the upper Baxter River reach, click in the direction of flow and double click when done jec intersection with Tule Tributary. Again, to be consistent, looking downstream first digitize the left flowpath followed by the right flowpath for each reach.
Step by Step: Flood Hazard Mapping
For example, we will use one bridge location in this exercise just downstream of the junction with tributary as shown below bridge location is shown in red:. The position of ineffective areas will be stored in a new table named IneffectivePositions.
Entering Flow Data and Boundary Conditions.
Now open the attribute table of River featureclass, and you will see that the information you just provided on river and reach names is entered as feature attributes as shown below: This will add a point for the watershed outlet in the ProjectPoint feature class. Tutorual successful completion of the process, the polygon feature class Catchment is added to the map. You will get a menu of parameters that you can assign.
Leave the other tutoriao unchanged.
A point is then created at the location of mouse click, and the following form is displayed: You can change the symbology of the grid to make it look pretty! These quantities are automatically computed when a feature class becomes part of a geodatabase.
For this tutorial we will run the model in steady state condition. The bridge should now look similar to the figure shown below: Confirm the input files, and click OK. Also, you can create other fields such as Name, Description etc that exist in BatchPoint, but that is not necessary. Just ignore this message and continue. 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: For example, we will use one bridge location in this exercise just downstream of the junction with tributary as shown below bridge location is shown in red: In the Optional Layers tab, make sure the layers that are empty are set to Null.
The output is the Catchment Grid layer. All vector and tabular data are stored in CedarCreek. Perform the re-classification of classes.
Close the snapping box, and then start digitizing the Tule Tributary from its upstream end towards the junction with the Baxter River.