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It consists of a series of procedures, tools and uses designed to process georeferenced data that allow preparing geometric data to import to HEC-RAS. HEC-geoRAS (Hydrological Engineering Centre – Geospatial River Analysis System) is an extension for ArcGIS developed by Hydrologic Engineering Centre of the United Army Corps of Engineering together with the Environmental System Research Institute (ESRI).
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It allows simulating flow in natural riverbeds or artificial channels to determine the water level being its main goal develop flood studies and determine floodable areas. HEC-RAS (Hydrological Engineering Centre – River Analysis System) is a one-dimensional hydraulic modelling program based on 4 types of analysis in rivers: This has made that, little by little, the majority of administrations have begun to demand the study of the impact that any type of intervention could mean over a riverbed´s dynamic using a sufficiently reliable hydraulic model, as for example HEC-RAS.
#HEC RAS TUTORIAL PDF UPDATE#
It is a free software, commonly used, and in constant process of update thanks to continuous improvements.
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Among all of them, there is no doubt that HEC-RAS software stands out (developed by Hydrologic Engineering Centre of the US Army Corps of Engineers) being one of the reference programs in its area. Nowadays, diverse softwares specific for hydraulic modelling simplify data entry and allow observing the results graphically, even exporting them in table format, making their interpretation easier. If, in addition, there are water works in the riverbed (bridges, canalisations…) or we wanted to know what would happen if they existed, the problem gets more complicated. It is not an easy task to answer these questions as we have to take into account several factors like the riverbed type, its slope or nature (type of material, presence of vegetation, etc.). When we study a segment of a specific river to see where the water would flow if reached a certain value, different questions arise such as what will be the height reached by the water profile? Will surrounding areas be flooded? To what extent? Route Analysis – finding the shortest path.Using ESRI products, Carto, Mapbox and Google Maps.The following dialog allows for selection of tables to be created. 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. 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. 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. 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).