 The Great Trigonometrical Survey, a Survey of India initiative to survey the whole land mass of India was started from the measurement of a small section of plain land with Perumbakkam Hill on the southern end by Major Lambton in 1802 CE.The Perumbakkam lake spreads over and is a vital source of water to residents and farmers in Perumbakkam, Vengaivaasal and Sithalapakkam village(s).Nearly 100 families raise vegetables and other crops whenever water is available in the lake.