Questions tagged [hydrology-toolset]

A set of tools for hydrologic analysis with ESRI's ArcGIS Desktop software. The Spatial Analyst extension is required.

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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)....
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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 ...
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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 - ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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.
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2 votes
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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-...
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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?
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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 ...
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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 ...
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220 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 ...
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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 ...
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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 ...
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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. ...
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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. ...
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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
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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 ...
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4 votes
1 answer
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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 ...
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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 ...
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4 votes
1 answer
201 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 ...
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913 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 ...
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