Urbanization has the capacity to permanently alter the hydrologic regime of its surrounding land. The water supply for Bangalore, India, has shifted from locally-sourced surface water to surface water imports and groundwater extractions. This change water largely driven by reductions in surface water supply and storage within the Arkavathy catchment which encompasses the western portion of Bangalore. While the major reservoirs on the Arkavathy supplied nearly 150 million liters per day (MLD) at full capacity, they currently only supply 30 MLD. Imports from regional reservoirs have reached limits imposed by inter-state agreements, and the groundwater table is falling rapidly due to excessive extraction. Rapid population growth and potential exhaustion of groundwater resources will force authorities to find new sources of water. Yet implications of past decisions are not well understood. Indeed, there is confusion regarding the reason for the drying of the Arkavathy’s rivers. My goal will be to understand the present water balance within the Arkavathy, and estimate the environmental threshold that caused the hydrologic regime shift. In order to overcome challenges associated with environmental data scarcity in this region, I will utilize a number of strategies for data synthesis to estimate changes in the water balance from early 1970s to present. My work will include remote sensing analysis, field work (including watershed sensor instrumentation, stable isotope analysis) and hydrological modeling.