The Ganga Canal (also, Ganges Canal) is a canal system that irrigates the Doab region between the Ganges River and the Yamuna River in India. The canal is primarily an irrigation canal, although parts of it were also used for navigation mainly of its construction material. Separate navigation channels with lock gates were provided on this system for boats to negotiate falls. Originally constructed from 1842 to 1854, for an original head discharge of 6000 cusecs, Upper Ganga Canal has since been enlarged gradually for the present head discharge of 10,500 ft³/s (295 m³/s). The system constitutes of main canal of 272 miles and about 4000 miles long distribution channels. The canal system irrigates nearly 9,000 km² of fertile agricultural land in ten districts of Uttar Pradesh and Uttaranchal