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Hydro - Arcmap 10

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Hi All,

I am a newbie here. I am creating a drainage map. The aim is to determine a wel-drained area for forest plantation. I was advised that it can be done using watershed delineation. I did fill, flow dir and flowacc. I used rainfall map in creating flowacc. The rainfall values that I used ranged from 600 to 1200 (input weight raster). I thought of using rainfall as input weight as this affects much the drainage. I generated a raster flowacc map (float) new map showing a value range of 0 to 17125897. I wonder why I got these big values. I dont know how I could delineate the areas that received a rainfall of 1000 mm and above. As I am not a watershed expert, I am having difficulty doing this. Please kindly assist me on this. Any advise would be highly appreciated.

Thank you in anticipation of any reply.


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