The book you are looking for is "Engineering Hydrology" by K. Subramanya . It remains the "gold standard" for hydrology curricula in Indian universities and has been updated in its 4th edition to include modern problem-solving techniques.
The book is praised for its simple, lucid language and India-centric focus, making complex hydrological processes accessible to students in tropical climates. Comprehensive Coverage: k subrahmanyam hydrology book pdf updated