Session 9

Rejuvenation of Lakes in Indian Cities: A Case Study for Betterment of Wetlands in Bangalore
Ranjana Siva1, Tarun Kumar2, Avantika Srivastava1, Kriti Bhalla1, Meenakshi Piplani1, Manisha Basu1, Vishal Mishra3
1M. S. Ramaiah Institute of Technology, Bangalore,India; 2Indian Institute of Science, Bangalore, India; 3Vijaya Vittala Institute of Technology, Bangalore, India

Pollution is defined as “to make something impure”. Water bodies, natural or man-made, are susceptible to pollution ranging from plastic waste disposals to algae blooms consuming oxygen. Bangalore, the silicon valley of India, is also referred to as “The city of lakes”. Until 1960, records show that there were 262 water bodies in Bangalore dotting its topography to impound runoff water so that citizens would always have abundance of water to drink, irrigate their lands and for fishing. In recent times, the number of lakes in the city has dropped drastically and even the ones present are subjected to dangerous encroachment, sewage, toxic waste apart from dumping of domestic waste, human and animal defecation; and this has now compelled the city to depend on Cauvery River, 100 km away, for all the water needs. Few of the lakes now have a permanent froth, consisting of harmful bubbles on the surface that occasionally catch fire due to the presence of oils and chemicals. For instance, in February 2017, Bellandur Lake caught fire due to this toxic froth on the surface of the lake. .
Samples from few of the lakes were tested for pH value, TDS value and amount of froth formed by shaking the contents. The results were compared; similarities and differences were drawn to identify patterns. Water body protection Act and flouted encroachment bye-laws were assayed.
A detailed report of the lakes can help further the resolution to the existing environmental crisis. Pattern was interpreted from the study and was found that lakes near urban housing and industrial area were more polluted than the lakes on the outskirts of the city. This study infers the broad sources of water pollution and provides creative solutions to the Urban Local Bodies (ULB) for the rejuvenation of these dying Lakes of Bangalore.