Landslides, floods, and droughts are recurring natural disasters in Nepal related to too much or too little water. The summer monsoon contributes more than 80% of annual rainfall, and rainfall spatial and inter-annual variation is very high. The Gandaki River, one of the three major rivers of Nepal and one of the major tributaries of the Ganges River, covers all agro-ecological zones in the central part of Nepal.

Aluminium (Al), an environmentally abundant and immobile element, has been studied for its mobility in the Gomati River Basin, a part of the Ganga Alluvial Plain, northern India. The dissolved Al concentrations in the Gomati River water and the Lucknow groundwater range over three orders of magnitude, from 14 to 77,861 ppb. In the Gomati River water, Al is classified as a moderately mobile element. Nearly 19% of Lucknow groundwater samples and all the Gomati River water samples have Al values above the permissible limit (200 ppb) recommended by the World Health Organization.

The unprecedented floods of 2010 in Pakistan highlighted the necessity of a well-calibrated hydrological model of the Indus upper catchment for a comprehensive flood risk assessment. However, this modelling was an extremely challenging exercise because of the lack of hydrometeorological data, which are difficult to collect due to the geography of the catchment.

The international watershed codification system for the Indian River basin is proposed for the better water resource management & monitoring, river basin planning, innovative research in hydrology, and sustainable water resource development. Based on natural system, the sub-continent largest transboundary to mini-watershed boundaries have been delineated from SRTM, ASTER, & CARTOSAT DEM data.