Please refer to the manual for further information or for a description of tools outside the scope of this tutorial. The following steps are based on Chapter 3 of the manual provided by HEC-RAS (accessible through HelpUsers Manual Supplement). The following dialog allows for selection of tables to be created. These elements are now created in the RAS Mapper component of HEC-RAS. 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.
If a table needs a user specified attribute, it is given in the User defined attributes column. 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. A record can also contain a value or a set of values following the keyword, i.e., after the colon. All records must contain one keyword, and all keywords end with a colon (:). The default method is Newtonian Assumptions which means that HEC-RAS uses the standard 'clear water' equations and does not apply any Non-Newtonian methods. Records and Keywords The HEC-RAS geometric data import file is composed of records, which in turn are composed of keywords and values. Select the Non-Newtonian Method first to activate the appropriate fields and methods associated with that option. When a schema is created from outside the RiverGIS use the Database > Refresh Connections List or the tool. The terms, variables, and parameters on the non-Newtonian editor change based on the method selected. If a connection or schema was created in a previous session, it can be chosen from the DB Connection or Schema dropdown lists. RiverGIS will automatically switch to the newly created schema, as shown below.
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. 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. A term river database refers to a database used by RiverGIS. As per Manual of HEC-RAS they provide the guidance to for width parameter for Failure of Dam. 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). I am trying to analyze Dam Breach in HEC-RAS Model.