> > Only that hole size is unrelated to the stream path, which is > > counterintuitive. > > The hole size is *very* related to the stream path. If you read my > previous posting then you should know that a small hole with high > pressure (=head height) will yield a fast stream that will break up and > be strongly braked by air, thus not rising to the expected height. But we aren't talking about rising to anything, merely the distance a stream of water emerging from a hole in a reservoir will attain. That, as Olin rightly pointed out, is largely defined by velocity, or at least, the ideal (maximum) distance is. And, as the document the first respondent posted points out, velocity of a stream of water leaving a reservoir is related to head height, but not hole size. Of course, in this real-world, non-ideal system, the water is going to slow down as it moves through the air and so the further it is allowed to fall, the less the final shape will resemble the predicted parabola, until the stream is eventually falling in a straight line. Which makes me wonder: could I use charged rods or plates to cause the stream to bend? THAT would be interesting. Mike H. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist