The SCS (NRCS) Curve Number is used to quantify infiltration loss during runoff calculation. As illustrated in Figure 1, the CN is determined by both soil types (Hydrologic Soil Groups,…
The SCS (NRCS) Curve Number is used to quantify infiltration loss during runoff calculation. As illustrated in Figure 1, the CN is determined by both soil types (Hydrologic Soil Groups,…
File geodatabase is a collection of files in a folder to store and manage both spatial and nonspatial data. File geodatabase originally came from ESRI ArcGIS and the QGIS has…
QGIS in an open source and free GIS software which can be installed by downloading the installation file at https://www.qgis.org. There are two ways to install QGIS: one is to…
Earth is not a perfect globe and its surface is irregular. GIS needs to use coordinates values (X/Y, or Longitude/Latitude) to describe an actual position/feature on earth in software system.…
RAS Mapper of HEC-RAS 6 has a set of terrain modification tools to modify original terrain. This post is the third of the 3 post series for terrain modification using…
RAS Mapper of HEC-RAS 6 has a set of terrain modification tools to modify original terrain. This post is the second of the 3 post series for terrain modification using…
RAS Mapper of HEC-RAS 6 has a set of terrain modification tools to modify original terrain. Basically the terrain modification tools creates vectors (lines/simple shapes/polygons) with elevations assigned to them…
RAS Mapper of HEC-RAS Version 6 has some basic but useful GIS functions to complete some GIS operations and spatial analyses common to HEC-RAS modeling, although it could not replace…
A bridge can be modeled in 2D domains using a geometry editor similar to 1D bridge geometry editor since HEC-RAS 6.0. HEC-RAS manual defines this method as Simplified 1D/2D Bridge…
In HEC-RAS 2D modeling, manning's n values (Roughness Coefficient) for 2D flow area are normally associated with land cover types and used to account for energy friction losses of overland…