MattinGA,
I think I might have a good guess where Rainman might have been going with his query regarding the amount of water that flows thru the creek, along with the frequency.
The gubmint might take exception to your idea. You need to be very careful.
Do you have any NRCS or other govmt agency oversight on this project? Any input? If not, don't ask...just yet. We might need to kick this around privately, first.