Supplementary information for: "Surface Water Quality Assessment of the Arkavathi Reservoir Catchment and Command Area, India, through Multivariate Analysis: A Study in Seasonal and Sub-Watershed Variations"

Based on the drainage features of the area, the study area is demarcated into six sub-watersheds. Drainage map, Geology map, Contour map, and Digital Elevation Model (DEM) map are prepared using RS and GIS.

Once the sub-watersheds are demarcated, surface water samples within these sub-watersheds are collected for further analysis as explained in the sections below. 30 samples were collected over a study period of two years covering three prominent seasons of pre-monsoon, monsoon, and post-monsoon periods. These samples were then subjected to various physical, chemical, and bacteriological tests such as pH, temp., DO, BOD, etc.