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I am studying flood flow using ArcGIS for Desktop.

When creating flow accumulation in hydrology, there is a weight raster.

However, İf you do not have it, the programme sets its value to 1 which is not a suitable approximation for the simulations.

How can I create a weight raster in ArcGIS for Desktop?

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This answer is probably a little late, but hopefully better than never. William Huber came up with an answer a couple years ago and I implemented it as a model in Model Builder.

See the following tool - http://www.arcgis.com/home/item.html?id=40d33968c44e4c9395c9c1ff1edd2bbe

and blog post - http://gislandscapeecology.blogspot.com/2015/04/better-flow-accumulation-with-positive.html

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