Lake Water Stratification and BOD

This blog post discusses the stratification of lake water and the BOD (biological oxygen demand) of diluted water. It also defines the epilimnion zone and the hypolimnion zone.

Questions

1. What is the equation for finding the BOD of diluted water?
2. What is meant by the epilimnion zone?
3. What is meant by the hypolimnion zone?

Answers

1. The equation for finding the BOD of diluted water is:

   “`python
   C = Cs * Qs / CR * QR

   where:

   * Cs is the BOD of sewage
   * CR is the BOD of river water
   * Qs is the sewage discharge
   * QR is the river discharge

2. The epilimnion zone is the top layer of water in a lake that is well mixed and aerobic. It is warmer than the hypolimnion zone and is the layer where most of the lake’s life exists.
3. The hypolimnion zone is the bottom layer of water in a lake that is cooler, poorly mixed, and anoxic. It is less oxygenated than the epilimnion zone and is the layer where most of the lake’s sediment settles.