An area of influence defined by boundaries related to distance. In human geography, this area is defined as the location from which customers or visitors are attracted. In hydrology, this area defines the location within watershed boundaries (also known as a drainage basin).

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-1 value in NextDownId attribute in drainageline

I'm currently working on adjoining catchments in Arc Hydro Tools and I have noticed that there are catchments that are not adjoined. I checked all the generated datasets and found out that the ...
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Delineating catchments using GRASS GIS?

I am trying to delineate catchment using GRASS. Can anybody point me to "easy to understand" type of notes for GRASS? Will appreciate any help.
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How to calculate Gradient from DEM?

I have a digital elevation model for a catchment area and I would like to calculate the gradient by cells. Is that possible and does anybody know the steps?