Delhi has been experiencing phenomenal growth of population since 1951 recording decennial growth rates of 52.44%, 52.91%, 52.98%, 51.45% and 47.03% during 1951-61, 1961-71, 1971-81, 1981-91 and 1991-01 decades respectively. One of the main causes for this spurt in population growth is migration into the city not only from the adjacent states but also from others such as Bihar. The growth of Delhi has contributed to increasing congestion and shortages of civic amenities. It has been felt that as Delhi grows, its problems of land, housing, transportation and management of essential infrastructure like water supply and sewerage would become more acute.