Questions tagged [hydrology-toolset]
A set of tools for hydrologic analysis with ESRI's ArcGIS Desktop software. The Spatial Analyst extension is required.
19
questions
2
votes
0answers
16 views
Variations in the number of Sub-Watersheds delineated by various tools [closed]
I have demarcated sub-watersheds using different tools like ArcHydro, ArcSWAT, and Hydrology tool (ArcGIS). The same input data have been used in all tools. There are 35 watersheds derived using ...
2
votes
2answers
53 views
Stream Feature generated from DEM is missing data
I tried to search other questions to see if this has been answered but couldn't find anything, so sorry if this is redundant. I use the Hydrology toolset in Spatial Analyst to create a stream feature ...
0
votes
1answer
59 views
arcpy fails to get spatial reference in hydro script
I have an ArcPy script that extracts a stream network from any chunk of terrain. It takes the terrain and if it's in a GCS, it projects it to the correct UTM zone prior to further processing. Though ...
4
votes
1answer
150 views
Limiting flow direction to D4 instead of using D8 in ArcMap?
Is there a way that I can limit flow direction to D4 instead of having it use D8?
Preferably looking for a way to do it within ArcMap.
2
votes
0answers
153 views
Chemical Spill on Land (ArcGIS, ArcMap 10.4.1, Hydrology Tools) [duplicate]
I'm a very new ArcGIS user currently working on my first project regarding chemical spills on land.
The Background:
Software that I have to use is ArcMap.
Currently, I am trying to use the pour-...
1
vote
1answer
102 views
Stream order from flow accumulation raster
I am looking to get Strahler Stream Order vector from a flow accumulation raster of a river network. I only find solutions with an elevation or direction raster.
Can I do this with GRASS?
1
vote
0answers
157 views
Streams from outlet using QGIS
I have an outlet (point inside a polygon, see the image below) and using global mapper I have computed the basin leading to this outlet.
I want also to get the main water channel of this basin in ...
0
votes
2answers
189 views
Understanding hydrology and DEM results?
In first picture, you can see an image of a lake(Bellandur lake, bengaluru, india). In second picture, you can see the flow accumulation data for the same area I made(after "fill"ing the sinks). As ...
0
votes
1answer
164 views
Flow Accumulation Stream Buffer
I would like to create a dynamic buffer based on contributing drainage area for a stream. I have done some research and I think the best way would be to use the flow accumulation tool but I'm not sure ...
1
vote
0answers
67 views
Deriving Stream-Velocity out of a DEM
I'm using Arc GIS Toolbox Hydrology...everything works fine. Moreover, it is possible to derive the potential stream velocity just out of the DEM? Informations about rainfall, infiltration, hydraulic ...
2
votes
0answers
751 views
Flow Accumulation and Flow Path Error from Flow Direction Raster in ArcMap? [closed]
I am trying to generate a flow accumulation and flow length raster from flow direction.
I have successfully generated a flow direction raster from a DEM that was clipped by the 'Clip (Data management ...
1
vote
0answers
67 views
Beaver ponds on stream profiles
I have a shapefile with polygons of beaver ponds and a DEM of the area of river watershed where ponds are located.
I want to check if a river gradient and a river valley shape effect area of a pond. ...
2
votes
0answers
110 views
Watershed tool producing same output as basin tool for all pour points [closed]
I am using the Hydrology Tools in the Spatial Analyst Toolbox (ArcGIS 10.3)
I am trying to delineate watersheds in a region in order to do spatial interpolation by top-kriging at some ungaged sites. ...
2
votes
1answer
43 views
How do I know topo layer contains DEM-altitude? ArcMap 10.3
How do I know if a topographic layer contains DEM-altitude? ArcMap 10.3
4
votes
0answers
346 views
Different watersheds for same area because of “burned streams”
Im trying to analyse where water is flowing which rains down to my project area. This is the DEM I have (my project area is bordered blue, the red marks are my pour points):
I learned from another ...
4
votes
1answer
359 views
Could bridges prevent ArcMap from creating correct watersheds?
I have a very detailed DEM of a region in Northern Germany. For hours I tried creating correct watersheds but my results all look illogical. Is it possible that bridges disturb the ArcMap Tools? I ...
1
vote
0answers
76 views
How to remove negative values from a created HAND model
I have used ArcGIS to create a HAND (height above nearest drainage) using an SRTM DEM.
However, some small portions have negative values in the model which is supposed to have zeros as the minimum ...
4
votes
1answer
152 views
Watershed Tool Straight Edge Problem
I'm trying to accurately delineate a watershed into sub-basins using dams as pour points. I'm using the hydrology toolset, but I can't seem to get rid of straight edges that are along some of the ...
1
vote
0answers
752 views
How can we extract the stream order branch?
Actually I am new to GIS, so I don't know much about technical terminology.
I have extracted a river network but now have a problem in distinguishing the branch order of stream (from order 1 to 2, 2 ...
