HEC HMS TUTORIAL PDF

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 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 function converts the input Stream Link grid into a Drainage Line feature class. Map to HMS Units.

You now have a very useful dataset for use in several hydrologic models and studies. Snapping of all the reaches at the junction is necessary for connectivity and creating HEC-RAS junction so make sure the three reaches tuutorial snapped correctly. 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: This will create a new folder inside your working folder with the name of the project CedarCreek, and hm all the relevant raster, vector and tabular data inside this folder.

Ideally you will store this information in the LandUse feature class added to the map. By doing the Ums reconditioning you can increase the degree of agreement between stream networks delineated from the DEM and the input vector stream networks. Give some name for the Run, and leave the default information for time and time interval unchanged.

Step by Step: Flood Hazard Mapping

Merging of Soil and Land Use Data. Stream Link Bec file name: This part of the exercise will expose you to some of the Watershed Processing functionality in Arc Hydro.

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The left and right flowpaths must be digitized within the floodplain in the downstream direction. The next step is to enter flow data.

HEC-HMS Exercise for CEK at University of Texas at Austin

HMS Project This function copies all the project specific files that you have created. Before you start digitizing the Tule Creek tributary, modify some editing options.

Be patient and CNGrid will be added to your map document.

If you need to uttorial, click the pan tool, pan through the map and then continue by clicking the sketch tool do not double-click until you reach the junction. After the computations are complete, the BasinSlope field in the input Subbasin feature class is populated. It allows displaying the profile of selected river reach es. Confirm the inputs, and click OK. However, if you want to distinguish your points for whatever reason from the default BatchPoint, it is better to just keep them in separate feature class.

The River and Reach attributes contain unique names for rivers and reaches, respectively. This process takes a few minutes.

This nec takes a while actually quite a while! Center of Gravity Method computes the centroid as tytorial center of gravity of the sub basin if it is located within the sub basin.

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.

Enter hypothetical flow conditions for these profiles as shown below: Once the table is created, create the following fields in it:. Due to some tutorrial reasons, if you get an error message at this point saying field cannot be added to a layer, save the map document, exit ArcMap and open the document, and try again.

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Watershed and stream network delineation using ArcHydro Tools.

You can select the Single Location tab to see the effect of points removal on the cross-sections. There are situations where you need to define flows at additional locations, but for this tutorial we will use the tutirial case. Creating the Flowpath Layer The flowpath layer contains three types of lines: For example, when you click on a Reach Ryou will see that Muskingum routing method is associated with it.

After the reaches are digitized, the next task is to name them. You can use the tools in Geometric editor to perform the quality check. The output is Drainage Point with the default name DrainagePoint that can be overwritten. All the cells in a particular segment have the same grid code that is specific to that segment. Using the Sketch tool highlighted abovestart digitizing the river centerline from upstream to downstream tutoriall you reach the intersection with Tule Creek tributary.

You should now see the Arc Hydro toolbar added to ArcMap. 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. A description of some of the land classes and their associated numbers can be found here. This tutoeial an assumption that the stream network data are more reliable than the DEM data, so you need to use knowledge of the accuracy and reliability of the data sources when deciding whether to do DEM reconditioning.

Flow Direction Grid file name: Catchment Polygons file name: