It is actually scary nowadays with the BBMP demolishing properties built on Water-bodies. As per the NGT guidelines there should be NO construction within 75m of a lake bed and 50m from a RajaKaluve (Storm Water Drain). So before buying a property in Bangalore, I would suggest you check it for Lakebed/Storm Water Drain Encroachments on the following tool:
https://www.zippserv.com/rajakaluve-and-lake-encroachment-check-map-bangalore.html#sthash.Aq5CJC40.dpbs