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Raining effect on pressure in water pipes

  1. Mar 28, 2015 #1
    Can we say that the pressure in the water pipes is increasing when it is raining heavy? Reasoning is that if the water company takes water from a nearby lake or river, rain causes higher water height in lake or river which causes higher hydrostatic pressure in the source which affects the pressure in the water pipes. So has this reasoning any validity or is it that the water companies use infrastructure and machinery that isolates the pressure in the source from the pressure in the pipe network and can maintain stable pressure in the pipes?
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  3. Mar 28, 2015 #2

    Doug Huffman

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    The pressure in mains water pipes is due to the head tank towers. Source pressure is quickly lost to flow resistance.

    Even in my POWS - privately owned water system - the pressure is due to an air loaded reservoir.
  4. Mar 28, 2015 #3


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    When it's raining people have no need to water their garden and are less inclined to wash their car... so perhaps demand falls and there is less pressure loss in the pipework?
  5. Mar 30, 2015 #4
    Rather then speculate about the possible causes of a condition which may or may not exist, I propose that you install a pressure gauge in you house and monitor your water pressure. If you notice fluctuations you can then try to observe what external events correlate to the fluctuations. Once correlations are established we can speculate as to the mechanism of the correlation. As of now we are speculating about non-existent data.
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