The final installment of the Hydrology trilogy: Flow Accumulation, see part one and two. This tool calculates accumulated flow based on the weight of all cells flowing into each downslope from the input raster. A weight of 1 is applied if no weight raster is provided, and the value 0 is used to identify ridges. The output value from each cell is the number of neighboring cells flowing into the center cell. Cells with high accumulation values may be used to identify streams..
The image below show accumulated flow calculated on the data shown in the flow direction post.
