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I would like to know if there is a tool in SAGA to conveniently plot the slope gradient-drainage area relation for a watershed with DEM as the input.

I am able to use DEM to create a channel network and calculate stream order for each branch. Now I want to calculate the drainage area for every branch of every stream order. In the result, I want to have the drainage area for each 1st order stream, drainage area for each 2nd order stream (that covers all 1st order stream within it), and so on. Is there a simple way to do that? I can create pour point for each branch and manually calculate. But that will be cumbersome. Using junction points as pour...

The Maximum Flow Path Length is a useful tool. I also looked at it. Is it possible to export the maximum flow path polyline vector from this tool? Looks like it does not do this at present.

Thanks for you reply. I can understand this procedure. The question is how I can determine the main channel (the longest path in the channel network) and the associated channel slope from the channel network.

Dear SAGA developers, I am trying to use SAGA to calculate the slope gradient of the main channel in a watershed. I think I need to first identify (preferably by the software rather than visually) the main channel from the channel network after watershed delineation, and then calculate the slope for the channel based on DEM. I can't find the right tool(s) for this task. Would you please advice? Eventually I need to do this for a number of watersheds and I plan to do it in R with the Rsagacmd package,...

Dear SAGA developers, I am trying to use SAGA to calculate the slope gradient of the main channel in a watershed. I think I need to first identify (preferably by the software rather than visually) the main channel from the channel network after watershed delineation, and then calculate the slope for the channel based on DEM. I can't find the right tool(s) for this task. Would you please advice? Eventually I need to do this for a number of watersheds and I plan to do it in R with the Rsagacmd package,...

I found the overland flow module in SAGA which I think is very useful. The overland...