Because of the valleys on which Bangalore is located, the lakes cascade naturally from higher elevation to lower elevation. As the lake on the higher elevation filled up, water would flow into the lower lakes. Bangalore has three main valley systems: Hebbal, Koramangala-Challaghatta, Vrishabhavati. The lakes thereby form a chain of reservoirs in each of the three valley systems. The existing rajakaluves are the inlets and outlets of the drainage system for the lakes.
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In many places, the sewage and water pipes are laid out in parallel. The joints of these pipes become weak at certain points and the water tends to mix with sewage. Of the 600 lakes on the revenue records, 189 live lakes are sewage tanks. In such areas, e-coli percolates bore wells and the Cauvery water.
Lakes have to be preserved to maintain the ecological balance. The environmental consequences of the lack of biodiversity and lake systems are not obvious, hence not understandable too. But the city will have to pay a price if we cannot preserve and rejuvenate at least the existing lakes.
In this regard Subramanyapura Uttarahalli Lake Improvement Trust (SUNLIT) wants to save one of the old lakes/ Kalyanis situated next to Vasanthapura Temple. We, the trustees, have planned Shramadhana (i.e. sharing of one’s time, thought and energy for the welfare of all) here this Sunday 14th July, 7:30 a.m. to 12 noon, with the help of like minded people who care about preserving our lakes.
This is an opportunity for you to join hands with us and make a beginning to save this Kalyani.