What is water balance method? Explain the mechanism of leachate generation with reference to water balance method.

The water balance method is a systematic approach used to understand and quantify the movement of water through a system. In the context of waste disposal, particularly in landfills, it provides an important tool for managing and predicting the behavior of water, including rainfall, runoff, evaporation, and the infiltration of water into the landfill mass. The core idea behind the water balance method is to ensure that all inflows, outflows, and changes in storage of water within the system are accounted for. This method is commonly applied to understand the generation of leachate, which is a liquid that percolates through waste materials and may carry contaminants.

The water balance equation can be described as follows:

\[
P + I = R + E + ΔS
\]

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