Select the Browse folder button to select an esri PRJ file. To set the projection, choose the Project | Set Projection menu item. This include terrain data and land cover data when you create new datasets or background data such as shapefiles and web imagery. The projection will be used to reproject any data that is brought into RAS Mapper. Set the coordinate system for the project. Click the RAS Mapper button from the main RAS interface. RAS Mapper will be used to create the geometry for the HEC-RAS model.

A visual chart of the plan and file structure for HEC-RAS is shown below.

So for this example, the following files will be created for the first of it's type.Ī Plan is similar to an alternative and will be comprise of a geometry file and a flow file. ) the project name will be appended with with a suffix corresponding an enumeration for the type of file that is created. When I create new data files (geometry, flow, plan. In the example above, the model title is 'Combined 1D/2D Model' and the project filename is 'Combined.prj'. Provide a name (and filename for the project).Ī window will informed you of the unit system to be used for the project.Īll project files will begin with the file name. Choose the File | New Project menu item on the main RAS interface, as shown below. This document will not provide the level of detail that you can get from the HEC-RAS User's Manual, HEC-RAS 2D User's Manual, or the HEC-RAS Mapper User's Manual and should be considered a guiding document for typical or general steps, guidance, and problems you might encounter in building and refining an HEC-RAS model.īefore you can start building an HEC-RAS model, you need to create a new project. Steps for creating, refining, reviewing, and comparing to alternative plans will be discussed. This document will describe the basic steps in creating an combined 1D/2D river hydraulics model in HEC-RAS.

Hec ras 2d example projects