Thank you for your interest sir!
Here is the link for the script. The file contains datas also.
http://arcscripts.esri.com/details.asp?dbid=13311
And here is the original article by creators of the script:
ArcCN-Runoff: an ArcGIS tool for generating curve number and runoff maps
Actually this is the point, I couldn't be able to understood what units did they produce runoff in...Rrunoff volume is asked to be calculated in cubicmeters (as I needed). Area data is in squaremeters (may be I was wrong) but precipitation is in inches.
To be sure I check the results; I look at the statistics for runoff volume column and area column. Division of total runoff volume value by total area value should give total runoff value (in m. or in mm.) as I know but it doesn't.
I would appreciate if you could tell me where I am mistaking.