Say it's a 2.5" butt (small, smooth and well rounded my personal favorite) so C=.9.
((2.5/24) ^2) * PI = .034 ft^2. .034 * .9 = .0307 ft^2. Say pitot = 30 PSI. 30/.433=69.284 ft (h). v=(2gh)^.5=(2*32.2*69.284)^.5=69.8 ft/sec. .0307 ft^2 * 69.8 ft/sec = 2.05 ft^3/sec, * 7.48 * 60 = 920 GPM. That's not too shabby! Brad
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