Abstract:
The accurate assessment of the available water resources is always a challenging task due to its significant variation in space and time. The variation becomes more vivid when assessments are carried out at the global, regional and local scales. Many global models have been developed worldwide, and many are still under development, to incorporate the complex hydrological processes. With upgradation of the knowledge about the hydrologic system and introduction of new techniques, models are being fine-tuned to replicate the climate behavior.