Sustainable Fresh Water Supply for Chennai City
Sustainable Fresh Water Supply for Chennai city, Tamil Nadu, India A Status Update
Joseph Thomas,
Chief Technology Officer, Villgro, Chennai, India
3H, IIT Madras Research Park, Kanagam Road, Taramani, Chennai, Tamil Nadu India 600113.
Telephone +91 44 6663 0400, email:joseph@villgro.org, mobile +91 98840 49116
Key Words: Rain water harvesting, Sustainable water supply, Urban fresh water.
Abstract
Chennai city, one of the major metropolises of India, is situated at the northern coastal edge of the State of Tamil Nadu. The city is more well-known by its older name of Madras. Currently, Chennai is inhabited by more than 7 million people in an area of 176 sq km. Water supply for this population is maintained by tapping a combination of surface storage reservoirs and aquifers. The Chennai Municipal Water Supply and Sewerage Board (CMWSSB), a statutory body established in 1978, is responsible for water supply and sewerage services in the Chennai Metropolitan Area. The main sources of public water supply in the city are the three reservoirs — Poondi, Redhills and Cholavaram — with an aggregate storage capacity of 175 million cubic metres (MCM). The other major resource is groundwater from the well-fields in the Araniar-Kortaliyar basin and the southern coastal aquifer, and also a large number of wells and tube-wells spread all across the city (Figure 1). Over-extraction of groundwater resulted in a rapid ingress of seawater, which extended from 3 km inshore in 1969 to 7 km in 1983 and 9 km in 1987[[i]]. Groundwater levels within the city also fell and brackish water began to appear, even in localities which earlier had good quality groundwater sources. The CMWSSB calculates water availability based on surface and aquifer contributions under its direct control. Since it perceived reservoirs and other surface supply as more significant for a long time, very little attention was paid to subsurface storage or ground water recharge. As an outcome of research, done
Joseph Thomas,
Chief Technology Officer, Villgro, Chennai, India
3H, IIT Madras Research Park, Kanagam Road, Taramani, Chennai, Tamil Nadu India 600113.
Telephone +91 44 6663 0400, email:joseph@villgro.org, mobile +91 98840 49116
Key Words: Rain water harvesting, Sustainable water supply, Urban fresh water.
Abstract
Chennai city, one of the major metropolises of India, is situated at the northern coastal edge of the State of Tamil Nadu. The city is more well-known by its older name of Madras. Currently, Chennai is inhabited by more than 7 million people in an area of 176 sq km. Water supply for this population is maintained by tapping a combination of surface storage reservoirs and aquifers. The Chennai Municipal Water Supply and Sewerage Board (CMWSSB), a statutory body established in 1978, is responsible for water supply and sewerage services in the Chennai Metropolitan Area. The main sources of public water supply in the city are the three reservoirs — Poondi, Redhills and Cholavaram — with an aggregate storage capacity of 175 million cubic metres (MCM). The other major resource is groundwater from the well-fields in the Araniar-Kortaliyar basin and the southern coastal aquifer, and also a large number of wells and tube-wells spread all across the city (Figure 1). Over-extraction of groundwater resulted in a rapid ingress of seawater, which extended from 3 km inshore in 1969 to 7 km in 1983 and 9 km in 1987[[i]]. Groundwater levels within the city also fell and brackish water began to appear, even in localities which earlier had good quality groundwater sources. The CMWSSB calculates water availability based on surface and aquifer contributions under its direct control. Since it perceived reservoirs and other surface supply as more significant for a long time, very little attention was paid to subsurface storage or ground water recharge. As an outcome of research, done
References: [vi] Vaidyanathan, A. with Saravanan, J. ‘The Urban Water Scene: A Case Study -Water Situation in Chennai City’ in A. Vaidyanathan, India’s Water Resources: Contemporary Issues on Irrigation. New Delhi, Oxford University Press, 209-247 (2006).