Firstly, I don't think that the manometer diameter affects how much the water rises at all... that rise is totally dependant on the pressure that is present in the fluid at a given point in the system. The manometers we use in school are often less than 1/4" OD tubes. Also, the pump does not have to worry about dividing its work into two to maintain the water column... as I have said before, the pump imparts potential energy rather than kinetic energy onto the fluid (represented by the piezometric head line). This manometer is only demonstrating how much potential head the water has. A clear way to illustrate this piezometric head line is to run a whole series of manometers at various points through the system, and then connect the tops of the columns (though this makes a much nicer visual picture if everything is in a straight line).
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Michael E. Robbins
M.A.Sc. Candidate, University of Toronto
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