WEAP Model Based Evaluation of Future Scenarios and Strategies for Sustainable Water Management in the Chennai Basin, India

Abstract

The gap between water supply and demand is increasing in several urban clusters of the world. This study uses the water evaluation and planning model to assess the water supply and demand dynamics in one of the large metropolitan regions of the Chennai hydrological basin. The primary water supply sources, including reservoirs, groundwater, inter-basin transfer, and desalination plants, were integrated into the model to simulate the current and future water demand and supply scenario. Three rainfall scenarios (excess, normal, and deficit) were utilized to assess their impacts on water supply. The study highlights the increase in unmet demand for normal and deficit rainfall scenarios. In response, various mitigation options were explored, including increasing groundwater recharge, reservoir capacity enhancement, water treatment plant expansion, additional storage, and utilization of water stored in rock quarries. The findings provide valuable insights for policymakers and stakeholders to develop sustainable water management strategies in the Chennai Basin. HIGHLIGHTS Water supply-demand gap keeps increasing in Chennai Basin, highlighting the need for proactive planning and efficient management.; Expanding desalination plants, increasing water treatment capacity, and increasing reservoir capacity through desilting and utilizing quarries can enhance water availability.; Groundwater recharge measures and alternative measures are crucial to bridge the supply-demand gap in the Chennai Basin.;

Keywords

• demand
• mitigation strategies
• sdg6
• rainfall scenarios
• waster water reuse
• water supply