Is there any way to make a structure of which water flows out of at a constant rate? Any way could be used to build the structure, including 3D printing.
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2A hole in a wall will allow water under constant pressure to flow at a constant rate. No 3d printer needed to make a hole, I guess? – CuriousOne Apr 26 '15 at 23:46
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What you need is constant pressure. Check out carburetor. – Mike Dunlavey Apr 27 '15 at 14:45
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Water flows at a constant rate if it experiences a constant pressure. If you make a two level structure where water from the top (main) reservoir is throttled by a float in the bottom level, you can maintain (almost) constant level in the bottom compartment regardless of volume of water in the top. And a hole in the bottom compartment will give you a constant flow rate.
You could make a structure with more than two levels - each would create better control of the level than the last.
Floris
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The key is the float-operated valve. Carburetors have had this for a century. – Mike Dunlavey Apr 27 '15 at 14:42