He said that a ram needs a minimum of three feet of fall. Lift water is
proportional to fall. For 10 feet of fall, if lift is 50 feet, the output
will be 1/5 the input water, for 100 feet the output water will be 1/10 the
input water. Five feet of fall will be half that and three feet will be
one third, 20 feet of fall will be double and so on.
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