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Questions tagged [watershed]

Use this tag when asking a question about a watershed related to GIS environment.

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Algorithm for catchment delineation with equal size basins

I am looking to delineate catchment areas of roughly equal size at specified outlet points along a channel. I need something that adds preference to capturing the floodplain on either side of the ...
Rob's user avatar
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0 answers
19 views

Watershed tool is running, yet no raster appears in ArcGIS Pro

I am working to delineate watersheds in ArcGIS Pro and have my sinks filled, flow direction and flow accumulation done as well as selecting an outlet. When I run the watershed tool, it seems to run no ...
Macall Hock's user avatar
1 vote
1 answer
40 views

Runtime in ArcPy versus ArcGIS Pro

I have at least two hundred huge TIFF rasters that I'm trying to process into floodplain polygons. They are cursory flood depth rasters for pluvial, fluvial and coastal flooding. First, I need to set ...
Tebetheia's user avatar
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0 answers
34 views

Different results between Whitebox Tools (WBT) and Whitebox Workflows (WBW)

I have two scripts that share the same input and use the same tools from Whitebox Toolbox. One script is written with Whitebox Workflows for Python (https://www.whiteboxgeo.com/manual/wbw-user-manual/...
Nil's user avatar
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Channel network from DEM of a river has unusual linear lines

So I needed to obtain channel network, basins, flow direction, etc. I downloaded aster_DEM from usgs, clipped it to an extent, warped it to UTM projection, then filled the sinks using Wang and Liu ...
SHAISHAV ACHARYA's user avatar
2 votes
0 answers
166 views

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 ...
zxz_341's user avatar
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131 views

Why does SAGA plugin "Channel Network and Drainage Basins" fail with the addition of one specific DEM tile?

I am working on developing a stream network and watershed layer in QGIS. I have 1047 DEM tiles I downloaded from NC (https://sdd.nc.gov/). When I try to run the plugins on the entire set (see attached ...
jerm's user avatar
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1 vote
1 answer
42 views

QGIS: determining the ice divide on a small ice cap

I have a GeoTIFF file with the surface elevation of a small ice cap. The ice cap has an ice divide, where the ice diverges. Part of it flows towards a glacier in the north, the other part flows ...
user236934's user avatar
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34 views

Delimit a watershed associated with a polygon - ArcGIS Pro

I have nearly the same question as Calculating watershed associated with polygon using DEM and QGIS but for ArcGIS Pro. I am starting with a polygon representing property boundaries and I need to ...
Erin's user avatar
  • 157
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1 answer
111 views

Querying the USGS National Map from R

I'm trying to download watershed boundary dataset geometries from the USGS National Map. Right now, I'm just trying to download 2 digit HU layers. You can see what I'm looking for here and here is a ...
setty's user avatar
  • 101
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1 answer
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How to identify straight edges on raster

I have water surface elevation rasters that I would like to QC for "inorganic shapes" like the screenshot below that are a result of modeling errors. What would be the best method to ...
Tebetheia's user avatar
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104 views

QGIS - The channel network and drainage basins are missing at the shoreline

I am new to QGIS, so I hope I have included enough information. My aim is to be able to determine, how much freshwater runs into the sea and where it enters the sea. I start with the original DEM file,...
GrumpyMum's user avatar
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1 answer
160 views

Calculating watershed associated with polygon using DEM and QGIS

I have found instructions that outline how to determine the watershed uphill of a selected point using a DEM in QGIS (https://youtu.be/CE7zZCkFbg4). I am starting with a polygon representing property ...
Brightside's user avatar
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0 answers
19 views

Applying D8 ( or other watershed algorithm) on urban areas with some artificial constraints

Referring to the post here on the limitation of D8 algorithm, or watershed algorithm in general. From the post I have the impression that even though the urban areas have a lot of flat surfaces ( ...
Graviton's user avatar
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Polygons sharing a vertex causes gaps in topology

I have created a floodplain with raster to polygon, smoothing/simplifying, dissolving, and repairing geometry after every geoprocess. Now I'm doing a topology check for must not have gaps and it has ...
Tebetheia's user avatar
2 votes
1 answer
149 views

Continental divide between rivers Danube and Rhine in Germany (watershed vector data) in Google Earth

Is there a line available for Google Earth that is showing the continental divide between the Rhine river and the Danube river? For me, it would be crucial to see where the rainwater is going to go.
Menno's user avatar
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2 votes
1 answer
605 views

How to resolve the watershed delineation failure in QGIS due to NO DATA values in 'Flow Direction File'?

How can I resolve the issue of getting errors while delineating a watershed in QGIS? I have tried using different DEMs (ALOS and Cartosat), but I am consistently encountering NO DATA values in the ...
dsbisht's user avatar
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1 vote
0 answers
42 views

Urban watershed delineation for flash flood events

I am currently trying to create urban watersheds using the ending points of flash flood events (in the NOAA Storm Events Database) as outlet points for a city. While doing so, the watershed that is ...
Rohan Singh Wilkho's user avatar
2 votes
0 answers
84 views

How to divide watersheds by iscochrones/travel times in QGIS?

I need to divide my watershed by isochrones of equal travel time to the output, dividing my watershed to inter-isochronal areas in order to use the time-area method to calculate runoff time series, in ...
MHA99's user avatar
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0 votes
1 answer
52 views

How to use Watershed tool in ArcPy

I have 40 pour points and want to find out the area upstream of each pour point. I see that I can use the 'Watershed' tool for this. However, I do not want to do this manually. Therefore, I am trying ...
Abhinav Gupta's user avatar
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0 answers
192 views

How to burn a sewer network into a DEM

As part of the sewershed delineation using the ArcHydro toolbox in ArcGIS Pro, I need to burn my sewer network into the DEM to recondition it based on pipe elevations. I have calculated and added the ...
Shahrzad Sarabi's user avatar
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0 answers
257 views

Unable to run SAGA-Terrain Analysis-Fill sinks (wang&liu)

I am trying to do a Watershed analysis using QGIS. However if I want to run the SAGA function Fill sinks (Wang & Liu) I get an error that the 3 files were not created (full error down below). I ...
Gnoebbas's user avatar
1 vote
1 answer
112 views

Detect sharp changes in elevation

I've been scouring the forums to see if there is a way to detect sharp, unnatural elevation changes greater than a certain amount in ArcGIS Pro. I've run across an issue in some DEMs where there are ...
Tebetheia's user avatar
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0 answers
79 views

Looking for an automated method for headwater watershed delineation at county scale

I am hoping to delineate watersheds, which are extremely small, across a large area. My objective is to create a workflow that will delineate all head water catchments through an automated process. I ...
Kurtis_Fisher's user avatar
1 vote
1 answer
604 views

Calculate intersect area for every feature in layer (ArcGIS Pro)

I have a .shp with multiple watersheds. I have a .shp with all the wetlands in the watersheds. I want to know for each watershed the area occupied by wetlands. So for watershed #1 there's Xkm2 of ...
Budgiebuda's user avatar
1 vote
0 answers
174 views

Remove inner boundaries in merged vector layers

I am using QGIS and the GRASS plugin for a watershed analysis where I would like to merge three small natural catchments into a larger one. I used the 'Merge Vector Layers' function (under the 'Vector'...
wainborn's user avatar
2 votes
2 answers
291 views

Water Pipeline analysis in PostGIS like Pipe Burst analysis, valves ON/OFF affected areas etc

I have made a network of Water Pipelines with valves of my town, now I want to carry out certain analyses like Pipeline Burst analysis to identify the least number of valves that needed to be turned ...
Chinmay's user avatar
  • 21
1 vote
1 answer
814 views

How to measure length of Sub-watersheds / Sub-Basins in ArcGIS Pro?

I am looking for guidance about reliable method of sub-basin length calculation. I am a student and working on morphometric analysis for prioritization of sub-watersheds of a river basin. I am using ...
AM38's user avatar
  • 23
0 votes
0 answers
31 views

Watershed analysis for construction site

Watershed analysis pretty straight forward except I lose understanding when it comes to selecting the pour point at a point along a stream. What if I have a construction site, what is my pour point?
Sam876's user avatar
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1 vote
1 answer
189 views

How to resolve the problem of multiple parallel streams and unmatched river flow in Stream Network?

I am working on sub-watersheds delineation of an area. The extracted streams do not match with the real world scenario. I have two issues; there are multiple streams lines which do not match with ...
AM38's user avatar
  • 23
2 votes
1 answer
318 views

What does SAGA's flow connectivity show?

In the 'Channel network and drainage basins' algorithm from SAGA in QGIS, a couple of maps are generated. I can't seem to find any documentation on the different output maps. Am I missing something?
PMouton's user avatar
  • 21
2 votes
2 answers
679 views

Finding longest flow path in multiple basins at once using ArcGIS Pro and Spatial Analyst

In my watershed I have around 400 basins. I need to find the max flow length in each basin. The "Flow Length" tool creates the flow length for the entire watershed, not for each individual ...
jcholly's user avatar
  • 166
0 votes
1 answer
117 views

Watershed tool in for loop on single feature point shapefiles creates empty rasters in ArcPy

I am using ArcMap 10.8. I have a flow direction raster and many point shapefiles with one feature each. I want to calculate one raster watershed for each point shapefile fd = "C:/sample/raster/...
TVolt's user avatar
  • 21
0 votes
1 answer
241 views

Hydrological catchment area for a road segment (QGIS)

I try to calculate the hydrological catchment areas for road segments in a mountainous region in QGIS. As far as I see, I can only calculate watersheds in general or for particular points. Is there a ...
W. Strabo's user avatar
0 votes
1 answer
817 views

Basin code in Google Earth Engine

How to find 6digit in HYBAS_ID of "WWF HydroSHEDS Basins Level 7" database. Technical Documentation says that: Next 6 digits represent a unique identifier within the HydroSHEDS network; ...
user2955459's user avatar
0 votes
2 answers
318 views

Problem with r.fill.dir on merged raster layer

I am going to use r.fill.dir on an area. The downloaded data comes as a set of tiles that puzzle together. In order to delineate watershed across tiles I need to merge them to a complete raster. ...
fredrik.sundberg's user avatar
0 votes
0 answers
430 views

Displaying in QGIS a TIFF product exported from GEE

I am new in GEE and am attempting to export and use a tiff product (WWF HydroSHEDS Basins Level 9) from GEE (output image, details, and code are shown below). The problem comes when importing and ...
Mar's user avatar
  • 1
1 vote
1 answer
83 views

Distance to a polygon along the stream flow path

I'm using Arc Hydro Tool for watershed processing and management. I'm in a stage where I need to calculate the distance of all cells in a raster (the study area) to some polygons along the flow path. ...
Ahmad Raji's user avatar
2 votes
1 answer
86 views

I want to use create legislative district polygons based on watersheds using QGIS, preferably

Generically, the problem is to take small polygons (HUC 12 watersheds intersected with counties and/or minor civil divisions) and disolve those into larger polygons that meet a couple of criteria: ...
Spencer Phillips's user avatar
2 votes
1 answer
1k views

Using Watershed Basin from SAGA in QGIS

I have a weird phenomenon going on in QGIS. I want to derive a channel network and also the catchment areas using "watershed basin" from SAGA. In the end I want to have the flow direction ...
HansKwent's user avatar
0 votes
0 answers
560 views

Water spread using SAR images (Sentinel-1) in Google earth Engine. Converting into Vector

I am running a water spread mask of Karnataka, India using SAR imagery (sentinel-1). I want the water classified pixels to be in vector (shapefile) to export them to google drive.. As I am new to ...
Navya Narayana's user avatar
1 vote
0 answers
197 views

Selecting area upstream in watershed tool of ArcMap

How do I calculate the watershed at several locations using the watershed tool of ArcMap? When I am doing it, I get the watershed cut at all the points, and not all the watershed upstream. I set the ...
Sss's user avatar
  • 219
0 votes
1 answer
63 views

How to isolate cooling influence of green roofs from land surface temperature data? [closed]

The idea in summary is to use land surface temperature (LST) data as a means to draw cooling extents around green roofs, as if you were drawing watershed basins around a lake, where high temperature ...
LostinSpatialAnalysis's user avatar
1 vote
1 answer
124 views

Flow Direction flowing opposite to actual direction

I am using ArcMap 10.7.1. I am trying to delineate multiple urban watersheds in GIS for the City of Denver (sometimes called sewersheds) using Spatial Analyst. I am looking at several drainage points ...
pilofg's user avatar
  • 11
3 votes
0 answers
40 views

Breaking up existing watershed polygons by flow to individual tributaries

I have an existing hydroshed dataset (HydroBASIN lev12 basins from the HydroSHED dataset) that I would like to split up further, so that each tributary has its own basin delineated (see below). I ...
Dana's user avatar
  • 31
0 votes
0 answers
57 views

Calculating the greatest length of a polygon using QGIS [duplicate]

I'm new to QGIS and I need to know the easiest way to calculate the greatest length of a polygon. I already know the "rule" tool but I want to do it automatically because I have a huge ...
Rémy Btl's user avatar
5 votes
1 answer
234 views

Selecting the transect lines which touches the divide of a polygon from the river line

I have a polygon and transect lines which passes inside the polygon. Here I want to select the lines which touch the drainage and divide. The transect lines split at the river intersection. Since ...
Gokul Anand's user avatar
2 votes
1 answer
698 views

Exporting same attribute values to separate layers and merging them in QGIS

I am trying to split watersheds of the same attribute table into separate layers. The Two two repeated values, for eg. SW1 and SW1 both are splits from a same watershed called 'SW1'. I am trying to ...
Gokul Anand's user avatar
0 votes
0 answers
15 views

ArcGIS tool which shows all cells a point flows into?

Is there a tool that is effectively the inverse of flow accumulation of a pour point - as in, if I have a specific point that is the site of potential pollution, is there a tool which will show all ...
dre627's user avatar
  • 29
5 votes
2 answers
700 views

Error while doing Watershed analysis using Python

I am trying to do watershed analysis using Python in jupyter notebook. Whenever I am passing commands regarding watershed delineation in Python I am getting output as raster matrix and when I am ...
Omkar Kadlag's user avatar

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