The primary textbook you are likely referring to is Engineering Hydrology by Dr. K. Subramanya (often misspelled as Subrahmanyam). It is a definitive resource for civil engineering students and professionals. Engineering Hydrology by K. Subramanya

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For any civil engineering student or professional in India, one name stands above the rest when it comes to understanding the water cycle: Dr. K. Subramanya . His seminal textbook, Engineering Hydrology

K. Subrahmanyam is a distinguished hydrologist with extensive experience in teaching, research, and consulting in the field of water resources engineering. He has worked in various capacities in government agencies, research institutions, and universities, and has published numerous papers and articles on hydrology and water resources management. His expertise spans a wide range of topics, including surface water hydrology, groundwater hydrology, water resources systems analysis, and flood risk management.

Current Edition: The 6th Edition (2024) is the most recent, co-authored by Priyank J. Sharma.