This document discusses a hydrology project in India that uses a decision support system (DSS) to analyze water resource scenarios. The DSS integrates tools and databases to help decision-makers analyze alternatives and consequences without an in-depth knowledge of modeling techniques. It provides timely information and allows scenario analysis. The river basin is divided into sub-basins modeled using hydrological and allocation models within the DSS to estimate components like rainfall, recharge, flow, and allocate surface and groundwater resources. The DSS is used to analyze scenarios like reservoir filling likelihoods and risks of low water levels under different planned water allocation scenarios.