A watershed is the area of land where all of the water that is under it or drains off of it goes into the same place.

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concept behind ARC hydro tool for watershed delineation [on hold]

I am working with arc hydro tool. just pressing and clicking buttons, i have delineated the watershed that I need. But, i don't know the concept behind this tool. Like, how it works? what parameters ...
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85 views

basin creation GRASS vs. flow direction

I have a strange behaviour in QGIS with GRASS tools. I am trying to create basins in the alp region and use he SRTM3 data. As I can see on the flow direction raster the SRTM3 data seems to act nice: ...
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19 views

Why do I get an error running Catchment Polygon Processing?

I am trying to run catchment polygon processing in ArcGIS 10.3, and this is what i get "error hresult e_fail has been returned from a call to a com component" Can you help me to debug this error?
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284 views

Error when using r.watershed in QGIS 2.10.1 with Grass

I am running r.watershed within QGIS processing the I get the error below. I draw your attention to: GRASS_INFO_WARNING(2205,1): Subprocess failed with exit code 256 GRASS_INFO_END(2205,1) ...
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1answer
45 views

Calculating watershed using snap pour points?

I am trying to calculate a watershed layer and have followed instructions from this previous question: General steps to create watershed boundary I have combined all these steps and run it as one in ...
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65 views

GIS or Remote Sensing technique to map sub-surface features?

I am trying to delineate agriculture tile drainage in Midwest. Does anyone know of any GIS and/or sub-surface remote sensing techniques to detect tiles/objects buried in shallow depth of soil? Does ...
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44 views

Riparian corridor delineation in QGIS

I am trying to delineate the riparian corridors using GRASS in R. But I am having some issues. So is there a plugin in QGIS using which I can extract riparian corridors using the already available ...
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2answers
326 views

ArcPy script stops running randomly with no error returned

I am doing a batch watershed and analysis process on 135 points. This script worked great the first time I ran it. Ever since the first time, however, I have had the script stop at random moments. ...
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101 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 ...
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1answer
66 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 ...
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2answers
327 views

Understanding flow accumulation

I used this youtube video: https://www.youtube.com/watch?v=FSblORbDyhc&list=PLWJ2X2wvq78QRGzl8Un5ADF0_4m5t99iD&index=11 to learn how to run flow accumulation and was successful. I realize it ...
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20 views

grass r.watershed to larger rivers parallel lines to same stretch

I'm trying create stream channels with r.watershed grass64. However, it shows two or three parallel lines for the same stretch of river. The river is large in some parts, but is just one river. Does ...
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33 views

Combining Raster and Vector data

I've created a Watershed raster data set (using the Watershed Tool) for a certain area. Within that watershed raster, there are 8 basins that appear I'm trying add the total population to each of ...
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2answers
78 views

How to create a reservoir for a dam site?

I have created the watershed for a proposed dam site point using SRTM 90m DEM. Now my task is to create a reservoir or pondage where water would be collected from the watershed. Above a watershed can ...
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4answers
2k views

What Algorithm is used by ArcGIS Watershed tool?

Does anyone know what type of algorithm is used in the ArcGIS Watershed tool (in the Spatial Analyst package)? Very little information given on Esri's website ... but I suspect it may be some kind of ...
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8 views

Determining flow accumulation to create watershed?

We are looking at sites and trying to determine what level of accumulation to extract by in order to create watersheds. Is there a standard? We cut out buffers (radius of 5000m) around each site.
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67 views

What is the difference between Specific Catchment Area and Total Catchment Area in hydrology?

I am getting stuck on the concepts of Total Catchment Area (TCA) and Specific Catchment Area (SCA) as I try to learn more about TOPMODEL. What do these metrics mean in hydrology? The context I ...
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37 views

Watershed delineation for multiple points in a single shapefile

I have a shapefile with 23 points along a 11 km river and I wish to create upstream watershed boundaries for each point without having to split the shapefile into 23 individual points. I have snapped ...
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188 views

ArcGIS ModelBuilder Clip Raster by Polygon Error

My task is to derive the hypsometric integral and hypsometric curve for a lot of drainage basins. Since it is very time consuming to do this manually, i have created a model (with help from this ...
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1answer
81 views

Python code to select streamlines within selected watershed

I'm trying to calculate total stream length for multiple, overlapping watersheds (i.e., each watershed contains the watersheds upstream of it). I have a flowline layer that I've run through the ...
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2answers
206 views

Watershed layers with names for each one for Europe or Sweden?

I am working on freshwater species and I would like, make a list of each watersheds used for each species. So I am looking for a watershed maps which contain name of the watershed. I found some good ...
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1answer
60 views

What are the meaning of Grass drainage direction values from r.watershed

In Grass r.watershed the D8 drainage directions generated from r.watershed are -8. -6.-4.-2, 2, 4, 6, 8 (-1 No Data) What actual directions are these? For example in ArcGIS I know 128 is up and so ...
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2answers
289 views

Numbering Watersheds using ArcGIS Desktop?

I am working with a watershed map, and I was wondering if there is a function or a way that I can get ArcMap to number the watersheds. For instance, if we have watershed X numbered as 0, I want the ...
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58 views

Preventing flow accumulation in one watershed from traveling up tributaries into adjacent watersheds?

I am using TauDEM in ArcMap 10.3.1 to try and calculate flow accumulation and generate stream networks for HUC10 watersheds. I am using 3m DEMs acquired from the National Map. The HUC10 I am working ...
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62 views

Delineate watershed using manual points in RSAGA

I'm currently trying for an automated solution to delineate watersheds within a large basin. I have a collection of locations (X,Y coords) for various tributaries reaching a larger river, and the ...
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27 views

Manually collecting data in ModelBuilder?

I'm not sure how to phrase my question in the title. Currently I'm trying to build a model for automatic watershed delineation. the ppt.shp (snap pour point) cannot be determined until flow ...
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2answers
2k views

Automatic Watershed Delineation in ArcGIS Desktop and Arc Hydro?

I am trying to delineate watersheds automatically using Arcgis/Arc Hydro. I got the drainage area contribution of stream segment (part of stream) as shown in figure stream. The corresponding drainage ...
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1answer
3k views

How to find the watershed area for each point in the river network using DEM?

Update#1: Thanks, Micha, I have followed your instruction and successfully use the modules in GRASS. I use r.watershed to get the basin raster and the drainage line: and I use r.water.outlet to get ...
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1answer
43 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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1answer
2k views

Water Flow Analysis in ArcGIS Desktop?

If I know that 10,000+ gallons of water were going to be dropped at a single point how could I model where it would flow. I would prefer something that worked in ArcGIS and could create a layer.
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2answers
879 views

How to find the watershed for each outlet point and sum values within it?

I have the following files to work with: Stream network of a basin; Outlet points for each segment* of the network and Points which represent water withdrawals along of the stream, which are not ...
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1answer
30 views

Is there a way to automatically find errors made by the Watershed tool?

I've delineated the watershed of near 7000 reservoirs with the Watershed tool in ArcGIS 10.1 and converted them in polygons. As you can see in the image bellow, some mistakes were made because the ...
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1answer
76 views

Is there a method to create watershed on google earth?

I want to create a watershed boundary for a lake only using google earth without using other source of data like srtm etc. Since we get the height of the location can we use it somehow and create a ...
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193 views

Arcgis 10.1 Archydro tools, converting RasterToPolygon How can I solve: ERROR 000732: Input Table:

I´m using arcgis 10.1 and Archydro tools. During the Catchment Polygon Processing, one of the steps used to define the watershed limits, I get the folowing error: Executing: CatchmentPolyProcessing ...
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1answer
53 views

Mean watershed slope - are there better methods than taking the mean of the contained slopes?

I am wondering if there are better methods for determining the mean watershed slope, other than taking the mean of the slope values contained within the watershed? For example, could or should one ...
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1answer
33 views

Measuring watershed area using pixel accumulation?

I am doing watershed delineation at the continental scale using a GTOPO30 DEM, projected spatial reference WGS_WGS_1984_UTM_Zone_15N. Using Arc10.... My basic workflow using ArcHydro tools: Project ...
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24 views

GRASS watershed analysis add storm inlets

Try searching for this with no luck. I am using r.watershed to delineate flow directions, subwatersheds, etc. All good, except that storm drain inlets, culverts and subsurface drainage courses are ...
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97 views

Simulate water runoff to get water height over each pixel of DEM

Here is my problem that I am trying to deal with. I have given a height map of around 512X512 resolution(It is Geo-referenced and I have the meta-data for this). And I have given that this area ...
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62 views

Extract a specific vertex

I am trying to create catchments/watersheds for each line segment in my stream network. I've managed to get the coordinates for all of the end nodes of the line segments to use as pour points. However ...
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52 views

How to separate shared watersheds using ArcGIS for Desktop or QGIS?

I have a similar problem than the one expressed in this question. Here's my situation : I need to have the full watershed of a point downstream of another point.The Watershed tool only gives the ...
2
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1answer
585 views

Hydrology tool dataset in ArcGIS 10.1 for calculating slope?

I am quite new to the hydrology toolset in ArcGIS and thought it may be useful for extracting slope data from a raster. I was wondering if anyone had experience trying to extract slope data upslope ...
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1answer
24 views

Does Scimap work with QGIS?

Does anybody know if Scimap ( http://www.scimap.org.uk ) works with QGIS? I know it is supposed to operate with ArcGIS and SAGA but as I am very much a beginner with QGIS I would like to know if its ...
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1answer
111 views

Watersheds tool does not create watersheds in ArcMap?

I`m trying to create watersheds and every time I run the Watershed tool, the result will be very interesting. I use snap raster and I set the extent of the output to the extent of the flow direction ...
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1answer
181 views

Does this ArcGIS flow accumulation example have an error?

The lower right corner of the flow accumulation example in ArcGIS Desktop's documentation has a flow accumulation value of 2. However, I only see one cell flowing into the lower right corner (the ...
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2answers
450 views

How to determine drainage area upstream from point?

I do not know how to come up with the drainage area (km squared) upstream of Lat 77.84, Long -30.96. I have converted my contour shapefile to a raster, identified and filled the sinks and then created ...
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54 views

Unusual results with Watershed geoprocessing tool

From the starting point of that I already have a flow direction raster and a pour points feature class, I get different results if I execute the geoprocessing tool Watershed using as input the raster ...
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1answer
126 views

How to separate shared watersheds?

I put a pourpoint at the end of a headwater stream, then another further downstream that is fed by that headwater stream plus two others. Obviously the pourpoint further downstream is going to share ...
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3answers
78 views

Discrete Waterpoints with Grass

I've been working with Grass GIS for about two months. I have to develop a method for the identification of target regions of small hydropower plants. Boundary conditions are a predetermined minimum ...
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2answers
3k views

Calculate line distances inside of polygons using ArcGIS for Desktop?

I'm working with two data sets: NHD polyline stream layer for my entire state HUC Watershed boundary Polygons for the entire state I am looking for a way to calculate the total length of streams ...
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1answer
610 views

Is there a SWAT model integration for QGIS?

I am trying to use SWAT (Soil and Water Assessment Tool) for watershed management activities. It is a set of commandline tools and needs a complex set of input data some of which can be generated from ...