Where does monsoon get over 200 lakh crore buckets of water from?

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Amey Pathak, a newly-minted Ph.D. in civil engineering at the Indian Institute of Technology, Bombay (IITB) under the guidance of Subimal Ghosh, has explored moisture sources of the summer monsoon. It is generally assumed that most of the water comes from the Indian Ocean. But surprisingly, a significant amount of rain over the Ganga basin and northeast India is derived from evaporation of water that’s already on land. More details can be found here