New answers tagged hydrology
Yes, I would use ArcHydro. I found a document on this page a while ago, that outlines some possible workflows (from the ArcHydro Team). There have been some changes compared to ArcMap 10.0 so for me it was quite useful.
You should look into the Soil Water Assessment Tool (SWAT) for this type of analysis. It really depends on the soil types in your area along with temperature and topography. There are simpler ways to approximate your runoff (USLE method or the rational method), however it would be better if you could get more information. http://swat.tamu.edu/ Good luck!
Top 50 recent answers are included