New answers tagged hydrology
Two suggestions The Australians opeate almost entirely on rainfall-driven models. Gets you around the snow melt modeling problem South Africa has a well-developed (mainly) event rainfall rainfall runoff model based on US SCS methods. For starters check the works of Prof Roland Schulze, U. Natal, Pietermaitzburg. Hope this helps bucky
??? presume you have no snowmelt and no baseflow to worry about? Curvve numbers only give respones to rainfall events. OTBE there are models that do this. Often/mainly out of USDA. Suggest AGWA for openers. Try SWAT.
If you are new to hydrology/arc I'd suggest using arc hydro (for 10.2 try download and documentation). This will give you average slope and 10-85 using Watershed Processing - Flow Path Parameters - Flow Path Parameters from 2D Line. elrobis's is correct that you may need to sample the slope more often depending on: (1) how the rivers were defined (think ...
I have a tremendous respect for GRASS and the r.tarraflow algorithm and I'm sure that given enough effort, you would be able to make it work for this application. But as an alternative, I develop a cross-platform free and open-source GIS called Whitebox Geospatial Analysis Tools (download here). Here is an example for how to use it for hydrological ...
If you're already familiar with the upstream trace tools, you should be able to apply the following steps: Create a constant raster. A constant value of zero is a convenient number. Subtract the elevation raster from the constant raster, leaving you with an inverse of the elevation raster. If you used a constant value of zero, your inverse raster is now a ...
There is a tool in the free and open-source (GNU GPL licensed) GIS Whitebox Geospatial Analysis Tools that can identify the flowpath from any point or collection of points specified either as a ShapeFile or as a categorical raster. The tool is called Trace Downslope Flowpaths: The tool takes a D8 flow pointer (flow directions) grid as an input, which ...
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