Hi Bill,
That makes sense to me, although just as gut feeling 26" seems low. The concern I have is that someone has quoted a water depth of 60+ inches per year. He does not specifically state 600 acres though. The land the company has purchased will total 600 acres but apparently not all of it will be spray able. Some of it will be covered in trees. To get an 100% accurate figure I will ned to know the exact acreage I guess.
If you have 2 min to look at a video you can see where he quoted these figures at a county commissioners meeting. We have a city council meeting coming up Monday and want to be 100% sure we have our facts right. If we don't and the chicken company catches us on the math it will make the rest of our claims look wrong as well.
Your equation makes sense to me. All I will need to do is change the acres if I can get a more accurate figure of the sprayable acres.
Just in case you are interested here is the video in question where he states his number:
http://youtu.be/Oh5eudNfaPQ
Thank you very much for your help with this. I really appreciate it.