New Delhi, Sept. 9 -- Incessant rainfall over the past week has led to water contamination in Vasant Kunj's C-9 Block, residents alleged, citing dirty supply over the past three to four days and developing ailments among residents of the locality. They said sewer lines were overflowing, causing it to mix with the regular water supply. There are 926 flats in the block and the number of residents is estimated to be between 3,500 and 4,000, by taking an average of four people per household. "We have not been able to use the water from our tanks since Friday night. It smells horrible, and one can tell that it is sewer water. After we initially learnt that it is contaminated, we emptied and cleaned our tank, and since then, have not turned on ou...