page 274 fig 16.3 what that graph indicates

The graph indicates the effects of sewage discharge on parameters like dissolved oxygen and Biochemical Oxygen Demand in river. Sewage contains organic matter. The microbes involved in their biodegradation consumes lots of oxygen which leads to decrease in amount of dissolved oxygen. This is shown by red line in graph. The growing microbes in sewage require more and more oxygen so BOD will rise. This is shown by blue line graph. 

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