Hi. I did not worked with hydrologic tools for a ling time so I need help. I would like to caluculate the area in front of a small dry valley or wadi (in the DEM) where the water would create an "alluvial fan" after heavy rain. I do not care about the volume I am more or less just interrested with areas will be dangered by the water. In the end a water/rain risk map. Can anybody give me a hint how to do it? I read a lot of readmes but all I found was watershed and so on what is not what I need. Thanks a lot Tobias
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