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I don't believe that you can perform a true Horton stream ordering using ArcGIS's Stream Order tool. However, the Horton stream order is essentially the same as the Strahler stream order, except that after the ordering, you need to replace each of the Strahler order values along the main trunk of the stream with the order value of the outlet. So if you can ...


8

While Jacub is correct that a stream ordering technique is your best bet for being able to represent stream magnitude or discharge, since the position in the network is a surrogate for these two stream characteristics, I would argue that you want to avoid using Horton-Strahler stream order for this purpose. It is seriously deficient in these applications, ...


9

You can classify the streams using, among others, the Strahler Stream Ordering method. In the Strahler method, all links without any tributaries are assigned an order of 1 and are referred to as first order. The stream order increases when streams of the same order intersect. Therefore, the intersection of two first-order links will create a ...


3

I have made hydrologically correct river-channels for the Lake Victoria basin. SRTM 90m does a reasonable but imperfect job. For example, I had to adjust numerous regions based on the actual flow of rivers. All is not lost though it sounds as though we can expect the 30m global dataset soon. I would suggest a dry run with 90 m data and then a rerun when the ...


4

You can download hydrology shapefiles from here for a number of countries around the world. Select your country of choice and Inland water as your subject. You should receive 2 types of shapefiles: A line shapefile depicting line features for rivers, canals and basins A polygon shapefile depicting area features for rivers, canals and basins I believe ...


0

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


0

??? 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.


1

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 ...


2

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 ...



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