Questions tagged [hydrology]
The study of the movement, distribution, and quality of water on Earth and other planets, including the hydrologic cycle, water resources and environmental watershed sustainability.
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To and from nodes in stream network using Whitebox Tools (in R)
I am experimenting with the WhiteboxTools via the WBT library in R. This is to design a scriptable and open-source workflow to extract stream networks from a digital elevation model (DEM).
From ...
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Drainage area at a point of my choice
I want to get drainage areas at specific points (the points are places I want to put culverts for a railwork construction).
The thing is that when I run either upslope area or PCraster tools, the ...
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QGIS SAGA Isochrone crashes
I am trying to make isochrones with SAGA GIS.
I am now having a problem that:
The Isochrone variable speed crashes or give odd outputs.
I have a DEM with 3.6km2, but the output is about 3 pixels,
even ...
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How to find a specific distance upstream from a point
I am trying to find a simple way to map sections of a river which are covered by a Mink trap.
So I have a river layer and a points layer for where the traps are placed.
I want to select all rivers (...
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Transfering attribute from line layer to polygon layer by their overlay in QGIS
I have a polygon layer that represents sub-catchments and a line layer that represents a stream network. There is exactly one feature in the line layer for each polygon. I have used v.rast.stats to ...
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QGIS: Further subdivide sub-catchments based on DEM
I have a DEM and a vector layer with existing hydrological sub-catchments. Is there a way in QGIS to further subdivide the sub-catchments based on the DEM?
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Perform a Mann-Kendall test on grd dataset downloaded from imd portal
I have a grd file downloaded from imd portal, now I want to perform a mann kendall test on this grd dataset. But I am not getting how to read grd file in Python and how to perform Mann-Kendall test, ...
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QGIS: Flow Accumulation Tool not progressing past 100%
I'm trying to do run the flow accumulation tool on a map where I am trying to extract drainage from a DEM however it has been stuck at 100% for several hours. I have put details of the files I am ...
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ERROR 010658: Failure in distributed raster analytics operation. Error when using hydrology tool 'Fill'
I'm currently doing a watershed delineation and river morphology computation using ArcGIS Pro. I have the DEM of the area and started with the hydrology tool "Fill" but it keeps having an ...
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Strahler ordering of existing vector stream network data with a DEM (SRTM)
I have a vector stream network (CanVec) and an SRTM DEM. How can I elucidate the Strahler order and attach that value to the vector stream network? For some reason the CanVec data doesn't have ...
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Creating point at downstream end of polygon using ArcGIS Pro
I'm trying to automate the process of adding a point to the downstream end of each polygon in a layer in ArcGIS Pro (Running V3.2.0 on Windows 11). I have a layer with the stream network along with a ...
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Creating Streams from endpoints and NHD Stream Layer using ArcGIS Pro with Spatial Analyst
I have a dataset for instream flow water rights that delineates the length of stream based on upstream and downstream endpoints and the miles of stream. I'm trying to create a GIS layer for this ...
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FlowAccumulation working when run as geoprocessing tool but not in ArcPy
I have a problem with this code:
#actual problem code
flow_dir_rast = flow_dir
in_weight_raster = mine_flac_weight
data_type = "FLOAT"
flow_direction_type = "d*"
# run the flow ...
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How can I use Whitebox hydrology tools with areas of internal drainage (ie. true sinks)?
I'm trying to use some Whitebox hydrology tools on a raster where I want to set inland points as areas of internal drainage and I don't understand how the fill tools treat NoData points when filling ...
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QGIS Catchment Creation from existing line shapefile (streams)
I understand the general process of creating a catchment.
Get DEM data Fill sinks
Build stream network
Create a line shapefile of the stream network
Choose outlet location and obtain coordinates
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