If you are looking for the (often the 4th or 5th edition, published by Tata McGraw Hill), you will find several improvements over older versions:

Includes expanded sections on , groundwater hydraulics , and statistical methods for hydrological data.

: Special sections have been added concerning the hard rock aquifers of India and tropical climate hydrology. Core Content Overview

for flood hydrograph calculation, hard rock aquifers in India, and artificial recharge techniques. Modern Instruments : Brief descriptions of the Acoustic Doppler Current Profiler (ADCP) and electronic velocity measuring instruments. Statistical Updates

The most recent version of Engineering Hydrology K. Subramanya 6th Edition , published by McGraw Hill India March 2024

Would you like a summary of the key topics in modern hydrology instead? I can help with that.