Geo-Eye

Abstract

Bangalore City doesn’t have nearby dependable perennial water source; therefore, the City is dependent on Cauvery River for drinking water which is at a distance of about 100 Km. The growing population and amalgamation of 7 CMCs and Kengeri TMC along 110 villages around the Bangalore City has increased the water needs considerably, thereby exerting more thrust on better management of treated water in the distribution system. The present population of the City is around 10 million and expected to increase to 20 million by 2030 as per BDA’s Comprehensive Development Plan. As the population is growing and the water needs of city is increasing the water demand and expected supply projections indicate a gap in supply-demand. It is expected that more than 600 Mld of water will be the shortfall for the year 2021 and it may go up to 1050 Mld during the year 2036 which is based on the present availability of water from Cauvery river. The number of lakes in Bangalore has reduced from nearly 285 (1970’s; spatial extent of Bangalore is 161 sq.km) to 194 (2016; spatial extent is 741 sq.km). During the last four decades there has been 79% reduction in water bodies and the number of lakes in Bangalore. During 1800, the storage capacity of Bangalore was 35 TMC. In 1970’s, lakes covered an area of nearly 3180 hectares and now the spatial extent of lakes cover an area of 2792 hectares. The current capacity of lakes is about 5 TMC and due to siltation, the current storage capacity of the lakes is just about 1.2 TMC, i.e., nearly 387 hectares of water bodies lost apart from reduction in the storage capacity by 60%.

Keywords: Rainwater Harvesting, Rooftop, Urban Water Supply, Water Resource ,Demographic growth.