QEHT Engineering Hydrology
In-process terrain, drainage-network and catchment analysis for engineering hydrology. Equivalent to commercial reference hydrology/raster toolsets, with no external executables.
A security-conscious QGIS plugin providing terrain, drainage-network
and watershed analysis equivalent to commercial reference hydrology
and raster toolsets.
All computation runs IN-PROCESS using only the NumPy and GDAL libraries
already bundled with QGIS. The plugin never spawns a child process, never
calls gdal_polygonize.exe, saga_cmd.exe or the GRASS batch wrappers, and
requires no pip installation. This makes it usable on managed workstations
where endpoint security blocks subprocess execution from GUI applications.
Tools: Fill depressions, D8 flow direction, flow accumulation, stream
network with Strahler ordering, catchment delineation with pour-point
snapping, and longest flow path with length/drop/slope for time-of-
concentration calculations.
Flow direction uses steepest descent weighted by distance and is written
in the standard D8 1/2/4/.../128 encoding, so grids interchange directly
with commercial reference GIS and hydrology toolsets in both directions.
Licensed under the GNU General Public License version 2 or later.