What is the relation between biological oxygen demand (BOD) and depth? I need to calculate the BOD of a drinking water tank and I have ultimate BOD at the surface of water, but I need to calculate it when depth varies. My calculations need an equation of de-oxygenation constant rate and BOD.

  • $\begingroup$ What is [BOD] ? $\endgroup$
    – casey
    Nov 19, 2015 at 16:21
  • $\begingroup$ Biological oxygen demand $\endgroup$ Nov 19, 2015 at 16:28
  • $\begingroup$ assuming BOD is proportional to SOD ,t here might be some relation with sediment composition with could be related with depth . Further read : ascelibrary.org/doi/abs/10.1061/(ASCE)0733-9372(1994)120:5(996) $\endgroup$
    – shrey
    Nov 19, 2015 at 18:45
  • 1
    $\begingroup$ I don't understand the question. Are you referring to the relationship between pressure and biological oxygen deficiency? Can you rephrase the question please? $\endgroup$ Nov 19, 2015 at 20:22
  • 1
    $\begingroup$ Wouldn't this depend on location? Can you be more specific and clearer in what you are asking? $\endgroup$ Nov 19, 2015 at 20:25

1 Answer 1


Biological Oxygen demand increases with accumulation of decaying organic matter in a water system. This means that BOD is highest where there is high concentration of decomposing organic matter in that system.

What is the relation between biological oxygen demand (BOD) and depth?

The answer may vary as in some cases organic matter floats on upper columns of water and can be decomposed readily by aerobic microorganisms manifesting an increased BOD.

However, this study which was conducted using waste water from stabilization ponds (depths ranging from 0-5m) shows that there is an increase in the Biological Oxygen Demand with increasing depth and this can be attributed to the settling down of organic matter in these ponds.


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