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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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1answer
28 views

Path movement along watercourse [closed]

Using ArcGIS 10.1, I estimated the least cost through the landscape, including the river network in the path. I gave the rivers a value of 0 and incorporated them in the slope (using the the formula ...
-1
votes
1answer
41 views

How can I reduce the size of shapefile (.prj, .shx, .shp) up to 8 MB? [closed]

It is sub basin photo which I want to upload to CHRS so that I can to download satellite precipitation data (https://i.stack.imgur.com/EQt3v.jpg)
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0answers
12 views

outputs of r.sim.water tool in GRASS GIS not showing

I was trying to simulate a water discharge process using the r.sim.water tool in GRASS under the hydrology tab. These were all the parameters used in the r.sim.water tool: r.sim.water -t elevation=...
1
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0answers
22 views

Choosing parameters for SAGA Wetness Index?

I've been working with SAGA GIS to calculate the Topographic Wetness Index of an alpine catchment. I am using the tool Terrain analysis > Hydrology > SAGA Wetness Index because, compared to ...
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0answers
62 views

Running SAGA on QGIS 3.4.1 (Ubuntu 18.04)

after a long struggle to get SAGA (2.3.1) even appearing in the toolbox of QGIS 3.4.1 (on Ubuntu 18.04), I am encountering the problem that all algorithms I have tried so far give the same error: ...
1
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1answer
26 views

Define catchment boundaries with GIS using R

Using a DEM, I want to define catchment boundaries for a given location on a river. Basically, what area drains into this point. In ArcMap, I can do that with flowacc and other tools; but I'd like to ...
1
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0answers
21 views

Split single polyline network at a point feature to make unique fields with unique distances

I am working with a large river network polyline shapefile. I am trying to calculate a dendritic connectivity index using a point shapefile representing locations. The river network shapefile has a ...
0
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1answer
29 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
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1answer
85 views

Selecting or highlighting upstream elements

I would like to use the information from the Swedish SMHI related with their hydrological model elements (catchment areas) that have a Containment hierarchy structure, each element has the information ...
0
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1answer
35 views

tauDEM flow accumulation (D8 or D-infinity) results is NA-values for some major rivers

I am having some trouble with tauDEM that I am hoping someone can give me some advice on. I'm running tauDEM via command line through R-studio. I am working with some 30m resolution SRTM DEM data in ...
0
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1answer
96 views

Watersheds in SAGA Fill Sinks Wang & Liu tool

I'm delineating some coastal subbasins using open source software. I have asked a similar question before (Delineating coastal subbasins using SAGA GIS or GRASS in QGIS?). I found that using SAGA Fill ...
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1answer
38 views

How to Create SCS (now NRCS) Curve Number Grid using GIS with European map (ESDAC dataset)?

After finishing the watershed delineation, and after creating the HMS schematic in Arcmap, i was trying to include the land use map and soil map in the process, by using the CNgrid preparation by ...
0
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1answer
32 views

Choose between two points with same name but different attributes in ArcGIS

I have a dataset of thousands of points, made by the intersection of flowlines with waterbody polygons. Each polygon has two (or sometimes more, if the waterbody has multiple tributaries) points made ...
-1
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1answer
47 views

Find minimum downstream flow distance from each polygon to any polygon in other feature class

The Problem: I have two polygons feature classes, let's call them "SourceAreas" and "DangerAreas". For each SourceArea, I need to know if water could flow to any DangerArea and if so, what is the ...
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0answers
128 views

Displaying flow direction using arrow in ArcGIS Desktop?

I created a flow direction raster out of a DEM using ArcGIS Spatial Analyst Tools/ Hydrology, so the directions are coded in raster values as displayed below. [http://desktop.arcgis.com/de/arcmap/10....
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0answers
28 views

Automatically locating endpoints (river sources) in a stream network

I have a stream network in ArcGIS 10.2.2 and I would like to know if it is possible to automatically add endpoints based on the stream network. The network is pretty big and doing this manually ...
2
votes
1answer
47 views

Assigning land cover type (in shapefile) to hydrologic soil shapefile in QGIS?

I have a land cover and a hydrologic soil group shapefiles which cover my watershed. They have different polygons. For example, a forest type land cover (one polygon in land cover shapefile) may ...
1
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1answer
48 views

TauDEM Model Availability

I'm trying to find the TauDEM Model Builder Models toolbox. I'm teaching myself how to use TauDEM to delineate watersheds. After running through some examples I started putting the modules together ...
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0answers
26 views

How to calculate connections between subbasins

I have a complete stack of grids and shapefiles from DEM (corrected) to subbasins created with SAGA tool Watershed Basins(Extended). In the attributes there is a lot of features such as area, outlet ...
1
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0answers
30 views

How to divide the flow that has multiple outstreams [duplicate]

I have an incoming drain (CO-1), that is split into multiple outgoing drains ( say, CO-2 and CO-3). It goes without saying that the incoming drain has to be higher than the outgoing drains. I'm given ...
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0answers
97 views

Flow accumulation algorithm open source code in C++ on Windows

I'm looking for flow accumulation open source implementation ( C++ or C# would do, Python no), on Windows, preferably the source code comes with Visual Studio project files so that I can just build ...
1
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0answers
39 views

Seeking open source alternative to Rivex (add-in for ArcGIS designed to process vector river networks) [closed]

I wish to process a river network - for the assessment of hydrological potential. Rivex is one addin (not free) which could be used with ArcGIS. Is there any alternative to this?
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1answer
48 views

Acquire direction between points along route

How can I generate a directionality attribute between two points along a route/line? Currently I am using Network Analyst to determine closest facilities, but I need a direction (upstream/downstream) ...
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0answers
127 views

Installing a SWAT plugin for QGIS version 3.0,

I am asked to install the qswat install and the swat editor. The swat editor requires me to install the .net framework plugin. The action is not received. Swat editor again requires me to install the ...
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0answers
20 views

Export raster issues in Landsat 5 images for land cover classification

I'm new in the field of remote sensing. I'm trying to use the science of remote sensing for long period hydrologic modeling for large river basins. Following up some literature and online tools, I've ...
2
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1answer
44 views

Cumulative distance along a raster stream network

I am looking to calculate the cells along a stream network from starting points to a maximum distance and stopping points. I need something like r.cost in GRASS (https://grass.osgeo.org/grass75/...
3
votes
2answers
90 views

How can the flow accumulation in a hydrological model/stream network be maintained across tiles of a large area of interest?

My study area is too large to be processed in its entireity by any hydrological modelling software I have found yet. I will have to break it up in to smaller areas, but there will be flow across these ...
2
votes
1answer
100 views

Calculating floodplain for river section using DEM only in ArcGIS Desktop?

I'm looking to create areas where water might go when a river floods its banks. I have a pretty good resolution DEM (5ft^2 for each "square"). I'm not looking for anything super accurate or precise ...
8
votes
3answers
344 views

Locate wet patches using DEM

I'm searching for a way to determine the location of wet patches, after rainfall, in a DEM. By this, I mean puddles. We are investigating the best locations to locate paths for recreational use. ...
1
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0answers
243 views

Qswat in newer version of QGIS

How can I setup QSWAT in newer versions of QGIS ? The link here says QSWAT requires QGIS 2.6. I tried installing QSWAT in new versions and it couldnot be done. Is there a way to install QSWAT in new ...
0
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0answers
27 views

SAGA Maximum Flow Length problems with the Coordinate systems

I'm new to SAGA. I've got a srtm data set from europe and want to charge the maximum flow length especially from the river Elbe. The data is in WGS84 So first I ran the tool "Fill Sinks"(Wang & ...
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2answers
71 views

Interpreting GLDAS 2.1 precipitation data

I am trying to use the GLDAS 2.1 3-hourly precipitation datasets available at: The dataset is documented here: https://hydro1.gesdisc.eosdis.nasa.gov/data/GLDAS/README_GLDAS2.pdf The data is ...
1
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0answers
266 views

SAGA functions not writing output raster using QGIS 3? [closed]

I'm using QGIS 3.0, using a SRTM 1 Arc Second to perform hydrological analysis using some of SAGA functions (such as Fill Sinks), if I choose temporary output, it works fine; if I choose to save to ...
5
votes
2answers
121 views

Performing Weighted Flow Accumulation in GRASS?

I would like to calculate a weighted flow accumulation raster with GRASS. I have a DEM and a rainfall raster. I am looking to calculate the rainfall accumulated downstream. Basically, it is similar in ...
4
votes
1answer
95 views

Calculate Polygon Centerline with a LeastCostPath approach

I'm working on deriving the centerline of a polygon, similar to this question or this one, using a different approach. I'm 90% done with the task, but cannot reach the final step. My approach is to ...
1
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1answer
73 views

Hydrological conditioning using stream vector in GRASS?

I would like to make an hydrological conditioning of a DEM using an available stream network in vector form. I know r.hydrodem but it doesn't allow to use the stream vector. I need something to burn ...
0
votes
1answer
35 views

Find all polygons upstream of a set of points? [closed]

Given two datasets 1) polygons for global river basins and 2) points for global hydro power dams; how can I determine the upstream basins for each dam? Not sure where to start with this, looking for ...
0
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0answers
47 views

Create river network by unsplitting touching segments

I am trying to use HydroSheds rivers in ArcMap 10.3 and unsplit the river segments all of which touch along a river. The unsplit tool does not, even with a common field. I tried the solution at: ...
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0answers
31 views

query a raster based on second raster location and values

I'm using QGIS 2.18.13 I have a stream network that I converted to a grid and assigned elevation values from a DEM to it. Now I want to find all the grid cells in a different raster that are <= to ...
2
votes
1answer
224 views

Flow Direction created from depressionless DEM inaccurate in flat areas

I am trying to build a flow direction raster for an area from a 1m DEM created from LiDAR. I need this in order to build a flow accumulation raster, so I can use that to build a stream network. I have ...
0
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0answers
327 views

Preparing SRTM (hgt) for use in SAGA GIS?

I am trying to prepare a raster file which i could use with SAGA processing tools for hydrologic analysis in QGIS. I am using Win 7, 32 bit, QGIS 2.14.20 and SAGA 2.3.2 I downloaded the srtm file in ...
4
votes
1answer
104 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.
1
vote
2answers
139 views

Figuring downhill gradient slope to riparian area on ArcGIS 10.5

I am currently working on constructing a countywide riparian area, which normally consists of the integration of water bodies, wetlands, wildlife corridors, flood prone areas and hydric soils. We ...
2
votes
1answer
174 views

Which algorithm is used for fill sinks in arc hydro tools?

How I can get information regarding the % of voids filled using fill sinks in DEM and the algorithm used to fill the voids using arc hydro tools?
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0answers
25 views

Updating a DEM with 'Proposed Infrastructure' from points provided by a surveyor

I need a little bit of help with an issue I am encountering. I have DEM A which is a bare Earth LiDAR derived elevation model I have A 3D Point shapefile that contains proposed earthwork ...
1
vote
1answer
141 views

Error running TopologicalBreachBurn in Whitebox GAT

I am trying to execute the TopologicalBreachBurn script in Whitebox GAT. This is my first time using this software so am generally unfamiliar with how it operates. I imported a DEM as an ASCII .txt to ...
1
vote
0answers
15 views

Pour-point identifying Chemical Spillage [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-...
0
votes
1answer
97 views

Find the nearest point on a stream network from a given point?

I have a vector layer for stream network created by r.stream.extract and then vectorized stream file using r.to.vect of grass algorithm in qgis. I want to find nearest point for a given point on ...
1
vote
1answer
73 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?
-4
votes
1answer
364 views

Fill DEM with water [closed]

I want view how a volume of water calculated with Hydrologic Study, accumulates in lower parts of my DEM at 1 meter resolution. My goal it's view the level that water reaches inside the raster. It's ...