**3.1 Topography**

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Global Digital Elevation Model (GDEM) was used to delineate the catchment boundary of the Hunza basin. The Hunza basin was delineated using ASTER GDEM v3 data in Arc GIS. The data was acquired from the website: https://lpdaac. usgs.gov/tools/data-pool/. The format of the downloaded tiles was Geo-TIFF and has the gridding resolution i.e. (30 m) and tile structure (1°x 1°).
