Calculus finds its application in various things in the world and some of its applications could easily be connected to the Nature. In today's time, we see a variety of situations dealing with pollution and one of the hazardous pollution is water pollution.

The project 'Replenishment of A Water Body' deals with the method to calculate the amount of time required for a polluted water body which has an inflow of fresh water with less amount of water pollutant and an outflow of water both at some rates. The method involves the usage of an Ordinary Differential Equation which is integrated to calculate the water pollutant amount as a function of time