It is becoming an increasingly common story - Another city is running out of drinking water. Chennai, India, the country's sixth-largest metropolis with 4.65 million people, is facing a dire water shortage. The coastal metropolis is the world's first major city to be facing a severe water shortage, but several large cities around the world may soon face a similar crisis. The four reservoirs supplying the region have dried up, leaving small potholes filled with muddy stagnant puddles of dirty water.