Questions tagged [hydrology-toolset]
A set of tools for hydrologic analysis with ESRI's ArcGIS Desktop software. The Spatial Analyst extension is required.
26
questions
0
votes
1
answer
73
views
Generate a very accurate mask showing where rivers and streams are using a DEM in QGIS
I would like to create a mask layer to show what the specific widths of a river or stream would be with certain variables. I'm using a high quality 1mx1m resolution DEM. I am able to do some things ...
1
vote
1
answer
96
views
How to add a column in one shapefile that is the sum of values in another shapefile?
I am trying to calculate a weighted average CN value for 500 drainage area catchments (S1-S500).
I have one file named "DA" which has S1-S500.
Name Total_Area
S1 1.5
S2 0.8
........
- 11
1
vote
0
answers
128
views
Multithreading single function using ArcPy with ArcMap
I am using ArcMap 10.5.
The problem
I have a huge DEM raster (more than 6 GB in size). I need to process this raster through Hydrology toolset in ArcGIS (fill, flow direction, flow accumulation...etc)....
0
votes
1
answer
215
views
Interpreting ArcGIS flow accumulation tool results in urban areas
Using ArcGIS 10.8 I successfully ran through the following geoprocessing tools to complete a flow accumulation analysis of a USGS 1/3 arc second DEM of a portion of Houston, TX:
Fill --> Flow ...
- 1,193
0
votes
1
answer
93
views
Incorrect creation of flow direction raster from interpolated DTM in ArcGIS
I have DTM for quite small area (400x200 meters) which was interpolated from elevation points. I want to create raster which will show water stream (not arrows but basically slope and river flow map - ...
- 355
-1
votes
1
answer
385
views
Generating Basin Layer Using Hydrology Tool gives ERROR 010067
I am new to the hydrology tool in ArcGIS Desktop and I have been trying to generate basin layer from flow direction layer for a very large area using the Aster dataset. Every time I run the process, ...
3
votes
1
answer
350
views
Apply volumes to points on a raster DEM in QGIS
I am trying to create a flood inundation map in QGIS from known flood volumes at specific points across a raster DEM. I could potentially do this manually for each individual point using contours ...
2
votes
0
answers
25
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
2
answers
274
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
1
answer
123
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 ...
- 1,455
4
votes
1
answer
283
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.
- 181
2
votes
0
answers
186
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-...
- 29
1
vote
1
answer
210
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?
- 505
1
vote
0
answers
250
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 ...
- 23
0
votes
2
answers
348
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
1
answer
254
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 ...
- 139
1
vote
0
answers
88
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 ...
- 11
2
votes
0
answers
1k
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
0
answers
81
views
Beaver ponds on stream profiles [closed]
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. ...
- 41
2
votes
0
answers
146
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. ...
- 21
2
votes
1
answer
45
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
- 41
4
votes
0
answers
411
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 ...
- 621
4
votes
1
answer
479
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 ...
- 621
1
vote
0
answers
93
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 ...
- 21
4
votes
1
answer
266
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 ...
- 41
1
vote
0
answers
1k
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 ...
- 11