Love to help. I've done some sound work before, calculating barrier heigth for sound, etc., which is harder to do than what you are asking. So just tell me the following and I will give you the hiegth:
How far away are the tees from the end of the fairway?
Any prevailing wind I should know of?
How "big" are you designing for (avg. golfer (220 yds off tee), good golfer (260 yds off tee), john daly (330 yds off tee)?
-Brian