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#TASKR GEOREFERENCE HOW TO#

O n the Coordinate System dialogue box, Click Select….

Choose the Name attribute field to set the subbasin element names.

Navigate to the … \Gridded_Basin\maps directory and select the Basin Punx.shp file.

Choose the Subbasins element type and click the Next button.

Go to the GIS menu and choose the Georeference Existing Elements menu option.

Subbasin and reach shapefiles have been created that contains an attribute with names that match the element names in the HEC-HMS basin model.

The subbasin delineation is shown below.

Notice the basin model is not georeferenced because the elements are displayed as icons.

Click the Select button and the existing project will open as shown below.

Navigate to the project directory and select the Gridded Basin.hms file.

The Open an Existing Project window will open click Browse to open the Select Project File window.

To open an existing project, click File and select Open….

Double click the HEC-HMS icon to start the program.

#TASKR GEOREFERENCE HOW TO#

The following steps shows how to georeference existing subbasin and reach elements. HEC-HMS uses the name attribute within the subbasin and reach shapefiles when importing information from shapefiles. The user can import subbasin and reach elements from shapefiles, or georeference existing HEC-HMS subbasin and reach elements. Starting with HEC-HMS version 4.3, there are tools to georeference existing subbasin and reach elements using the geospatial information in shapefiles. The basin model was originally defined by delineating subbasins and river reaches using non-GIS tools, therefore, the basin model elements were not georeferenced. Task 1: Import and Georeference Subbasin and Reach Elements Mahoning Creek is downstream of the confluence. The confluence of Stump Creek and East Branch Mahoning Creek is located east of the enclave of Big Run. Primary conveyance streams include: Stump Creek East Branch Mahoning Creek and Mahoning Creek.

The Punxsutawney Watershed (400 km 2) is part of the Allegheny River Basin located in western Pennsylvania, USA. In this tutorial, you will perform five tasks to georeference existing subbasin and reach elements before generating a grid cell file and creating a grid region: 1) georeference the project, 2) process terrain information to create a flow direction grid, 3) generate grid cell file 4) create grid region and 5) create links in an HEC-HMS basin model. This tutorial is designed to help the user of HEC-HMS learn how to apply a gridded precipitation dataset to a non-georeferenced project. The user then must specify the default grid region to be used in the basin model. The user can then refer to the grid cell file and create a grid region as a model component. The grid cell file specifies which grid cells are in each subbasin and the properties of each cell including location, area within the subbasin, and distance to the subbasin outlet. When converting a lumped basin into a gridded basin, the user needs to process the terrain data for flow directions, and then generate a grid cell file. In order to use gridded precipitation in the meteorological model and hydrologic methods in the basin model, the user must first georeference the basin model. These older models often use the lump approach for representing subbasins and hydrologic methods rather than the more useful gridded models, which allows the watershed to be represented in greater detail spatially. When background maps of the subbasins and reaches are available the coordinate system information is often missing. These models often do not have background maps of the subbasins and reaches. Many of these existing models are not georeferenced with coordinate system or projection information. There are existing HEC-HMS models that can be updated and improved to utilize gridded precipitation and hydrologic methods. Initial_Gridded_Precip.zip Final_Gridded_Precip.zip Instead, use the structured discretization method - Applying Gridded Precipitation to a Non-Georeferenced Project - Structured Discretization. After HEC-HMS version 4.6.1, the *.mod file should no longer be used. This tutorial is designed to work with HEC-HMS 4.4 though 4.6.1.