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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If cells with higher elevation surround a cell, the water is trapped in that cell and cannot flow.
Click OK on the message regarding successful creation of the project. If you click at a point along the profile, a corresponding point showing its location on the river reach will be added to the map display shown below as red dot. All the cells in water surface grid that result in positive values after subtraction are converted to a polygon, which is the final flood inundation tutoiral. HMS Project This function copies all the project specific files that you have created.
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:. In addition, HEC-GeoRAS requires the land use polygons to be non multi-part features a multipart feature has multiple geometries in the same feature. Stream Segmentation Grid This function creates a grid of stream segments that have a unique identification.
This tool will assign station number distance from each cross-section to the downstream end of the river to each cross-section cutline. The bridge does not even cross the river in this case!
This process takes a few minutes. The LineType field must have data for each row if all flowpaths are labeled.
Similar to previous tables, the data are organized as the feature identifier XS2DID ttuorial, its relative station number and the corresponding n value as shown below: Give some name for the Run, and leave the default information for time and time interval unchanged.
You can use select by attributes option to do this. Terrain processing involves using the DEM to create a stream network and catchments. You can check this by right-clicking on the data frame and looking at its properties. You tutoriall get a message after the data check saying the check data is completed successfully as shown below.
Each line in the feature class carries the identifier of the catchment in which it resides. You will notice that only a few cross-sections had points removal. This tool will verify all the input datasets. This function delineates the watershed upstream of each point in an input Batch Point feature class. For example, buildings in the floodplain and levees are considered obstructions.
To digitize the upper Baxter River reach, click in the direction of flow and double click when done at intersection with Tule Tributary. This is where ArcHydro will store its grid results.
HEC-HMS Exercise for CEK at University of Texas at Austin
The input information is saved in the attribute table of the BatchPoint feature class. The value corresponds to the value carried by the stream segment that drains that area, defined in the stream segment link grid.
The cells in Str grid with a value of 1 are symbolized with black color to get a stream network as shown below: Leave the other options unchanged. Ideally you will store this information in the LandUse feature class added to the map. Entering Uttorial data and boundary conditions. In the Optional Layers tab, make sure the layers that are empty are set to Null.
Preparing land use data for CN Tutorlal.
It is then cumbersome to find out which feature classes were used during pre-processing, and which feature classes contain results for visualization. The ArcCatalog-view of the tutoriak folder is shown below:. DEM reconditioning involves modifying the elevation data to be more consistent with the input vector stream network. Similar to previous tables, the data are organized as the feature tuutorial XS2DIDits relative station number and the corresponding n value as shown below:.
For example, we will use one bridge location in this exercise just downstream tutoriial the junction with tributary as shown below bridge location is shown in red: The issue of non multi-part features is taken care of for the tutorial dataset. You will also notice that a new data frame CedarCreek is added in ArcMap containing data for cedar creek. Catchment Grid file name: Click with your mouse at any point to determine the flow path.
Step by Step: Flood Hazard Mapping
Watershed and stream network delineation using ArcHydro Tools. Arrange your display so that Fac, Catchment and DrainageLine datasets are visible.
The minimize area change will reduce the impact of change in cross-sectional area as a result of points removal. Before we move forward let us make sure that the reaches we just created are connected, and populate the remaining attributes of the River feature class. Upon successful completion of the process, the flow direction grid Fdr is h,s to the map.
Click OK on the process completion message box.
Step by Step: Flood Hazard Mapping | UN-SPIDER Knowledge Portal
You can respond to this message by selecting either yes or no – it does not matter in this exercise because we will join the table only once. Confirm the input datasets to be checked, and click OK. This will create a mesh by delineating watershed for the outlet in Project Pointand display a message box asking if you want to create a project for this hatched area as shown below: This function fills the sinks in a grid. Click on Select Profiles to Export button, and choose the profile you want to export.