The amount of water the city of Chennai is entitled to each year from the Telugu Ganga project, a water supply scheme implemented in 1980s jointly by the states of Andhra Pradesh and Tamil Nadu. Water is drawn from the Srisailam reservoir and diverted towards Chennai through a series of inter-linked canals, over a distance of about 406 kms, before it reaches the Poondi reservoir near Chennai. The main checkpoints en route include the Somasila reservoir in Penna River valley, the Kandaleru reservoir, the 'Zero Point' near Uthukkottai where the water enters Tamil Nadu territory and finally, the Poondi reservoir.