I have started reading more about flow calculation - and realised that there are two major ways of calculation the flow direction - or distribute the flow: A) The Standard Flow Direction: Choosing the neighboring cell with the lowest value from the DEM, compared to the value of the calculated cell - and distribute all "upstream area" to this single cell. B) The Multiple Flow Direction: Choosing all the neighboring cells with values lower than the calculated cell and distribute "upstream area" to all these cells.
Now, my questions are: 1) Is it possible to try this Multiple Flow Direction calculation in ArcGIS, or using some kind of other extensions? 2) What it the point of calculating this Multiple Flow Direction? When do we need this way of calculating flow-directions and why is this not a part of the "standard" tools in ArcGIS and its extensions?
