Chennai is the capital city of Tamil Nadu and the fourth largest city in India. It has a population of over 4 million people and covers around 1,189 square kilometers. Chennai receives its water from various sources, including local aquifers, desalination plants, and reservoirs, but demand is expected to exceed supply by 2031 if additional sources are not developed. The city faces issues with solid waste management, flooding during heavy rains, and inadequate water supply for both drinking and irrigation needs.