Users create new tables using Database -> Create River Database Tables or tool. There are three tables always required for a model creation: river lines, cross-sections and flow paths.
Refer to the HEC-GeoRAS User Manual for definitions and context of the steps and tools in this tutorial, found in the Help Menu of the GeoRAS toolbar. If a table needs a user specified attribute, it is given in the User defined attributes column. Exercise Topic: Getting started with HEC GeoRAS Objective : Create a HEC-RAS model of the George Mason University watershed using the GeoRAS toolbar in ArcMap. The table below lists river database tables created by RiverGIS. There is a table for river lines, cross-sections etc. Model geometry data are stored in a river database tables. When a schema is created from outside the RiverGIS use the Database > Refresh Connections List or the tool. If a connection or schema was created in a previous session, it can be chosen from the DB Connection or Schema dropdown lists. In HEC-RAS main project window, use File/Import HEC-RAS Data and choose the file Waller.g01. RiverGIS will automatically switch to the newly created schema, as shown below. To create our geometric model of Waller Creek for example, we need to import the geometry file that you just downloaded. Users can create a schema in a number of ways: using pgAdmin, QGIS’ own DB Manager or from within RiverGIS dialog by choosing Database > Create New Schema or clicking tool icon from Database toolbar.
Therefore, the first step is to create a new schema for a model.
Each model goes to its own schema, a kind of database directory for data grouping. The PROJS clause begins with the official name of the projected coordinate system. The entire projection file is wrapped in the PROJS, which stands for projected coordinate system. Until a database and schema are set in RiverGIS window, most of the tools are inactive.Ī single PostgreSQL database can be used to store many models geometries. The image below is the projection file for the Muncie example project that comes with HEC-RAS. The documentation has been broken up into the following three categories: Documentation Description Users Manual This manual is a guide to using HEC-RAS. Each document is designed to help the modeler learn to use a particular aspect of the modeling system. A term river database refers to a database used by RiverGIS. HEC-RAS Documentation The HEC-RAS package includes several documents. A fundamental difference from HEC-GeoRAS is that the RiverGIS uses a PostgreSQL database with PostGIS spatial extension for data storage (see Requirements for installation instructions).