Water dynamics, well piping help

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SUMMARY

This discussion focuses on optimizing water flow from a well using gravity over a 250m distance with a 3m overall fall. The user inquires about the effects of increasing pipe diameter from 3/4" to 1" for the last 100m section, which descends a hill. It is established that a larger diameter pipe reduces friction, potentially enhancing water flow and pressure to the trough. The concept of the siphon effect is also highlighted, indicating that proper priming of the pipe is essential for effective operation.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Knowledge of pipe sizing and friction loss calculations
  • Familiarity with gravity-fed water systems
  • Experience with siphon mechanics
NEXT STEPS
  • Research pipe diameter effects on flow rate and pressure loss
  • Study friction loss calculations for various pipe materials
  • Learn about siphon design and operation techniques
  • Explore methods for priming gravity-fed systems effectively
USEFUL FOR

This discussion is beneficial for civil engineers, plumbing professionals, and anyone involved in designing or optimizing gravity-fed water systems.

lalababa
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I would like to pipe a water well ( using gravity alone) with a 250m run and an overall fall of 3m. A large barrier (a hill) is middle ways . The last 100m down the hill has most ,if not all the fall. The question is if I pipe this last 100m with a larger diameter (from 3/4" going to 1") would this increase the 'pull'/ 'suction'/ from the well and the pressure to the trough?

I have already been told the bigger pipe would cause less friction.

If force (gravity) is the same across both sections of pipe and so is the pressure then the volume of water in the smaller pipe would have to be greater? Yes?...So I am thinking that more water will be sucked up higher on the small section by making the later section a larger diameter?:biggrin: Many thanks in advance!
 
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You'll get the siphon effect only after you get the water over the highest point.
 
Thanks for reply, I will try to prime all the pipe.
 

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