Again, I'll collapse many replies into one: On 3/1/06, Marco Genovesi wrote: > > Hi Mike, > I'm non sure if this may be useful for your question > (however, many methods for water measurements are explained) > > http://www.usbr.gov/pmts/hydraulics_lab/pubs/wmm/ Yes, actually, it was VERY helpful. Apparently, water escaping from a hole in a reservoir under a given head h will travel with velocity equal to an object dropped from height h. Hole size is NOT a parameter! Olin pointed out: > Once you have the velocity of the water as it leaves the hole, plain old > highschool physics will give you the parabola. The speed of the water would > be a function of the pressure and probably the diameter at small diameters. It seems not. I will experiment, some, but I don't know if it's worth it. A brief experiment last night suggests that any head height above maybe 1/2" starts to require a very large basin indeed to catch the water. Adam suggested a website: http://www.wetdesign.com Which seems pretty good. I'll check it out for further info. Thanks for everyone that responded. Now I'll impart a little bit of info to those reading this topic with bated breath: using an ultrasonic mister with flat tonic water yields a mist that glows under a blacklight (or so I've heard). Mike H. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist