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I have 30 years daily rainfall data. How can i calculate the mean monthly runoff, minimum monthly runoff and maximum monthly runoff with the available rainfall data using GIS?

I would like to use SCS curve number method for run off computation.

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What have you tried already and what GIS software do you have? –  lynxlynxlynx Dec 15 '12 at 10:14
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Can you show us a sample of the daily data? –  BradHards Dec 15 '12 at 10:25
    
I have ArcGIS version 9.3 with me. And i would like to use SCS curve number method for run off computation. But i am confused with what kind of statistics that i should adopt with the daily rainfall data for getting mean,minimum and maximum monthly runoff –  saranya Dec 15 '12 at 12:27
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