Irrigation
The importance of Yamuna in the Indo-Gangetic Plains is enhanced by its many canals, some dating back to as early as 14th century CE by the Tughlaq dynasty, which built the Nahr-i-Bahisht (Paradise), parallel to the river, it was later restored and extended by the Mughals in the first half of seventeenth century, by engineer Ali Mardan Khan, starting from Benawas where the river enters the plains and terminating near the Mughal capital, Shahjahanabad, the present city of Delhi. As the Yamuna enters the Northern plains near Dakpathar at a height of 790 meters, the Eastern Yamuna Canal commences at the Dakpathar Barrage and pauses at the Asan and Hathnikund Barrages before continuing south. The Hathnikund was built in 1999 and replaced the downstream Tajewala Barrage which was completed in 1873. The Western Yamuna Canal begins at the Hathnikund Barrage about 38 kilometers from Dakpathar and south of Doon Valley. The canals irrigate vast tracts of lands in the region, then once its passes Delhi, it feeds the Agra Canal built in 1874, which starts from Okhla barrage beyond the Nizamuddin bridge, and the high land between the Khari-Nadi and the Yamuna and before joining the Banganga river about 20 miles below Agra. Thus during the summer season, the stretch above Agra resembles a minor stream.
A heavy freight canal, known as the Sutlej-Yamuna Link (SYL), is being built westwards from near its headwaters through the Punjab region near an ancient caravan route and highlands pass to the navigable parts of the Sutlej-Indus watershed. This will connect the entire Ganges, which flows to the east coast of the subcontinent, with points west (via Pakistan). When completed, the SYL will allow shipping from India's east coast to the west coast and the Arabian sea, drastically shortening shipping distances and creating important commercial links for north-central India's large population. The canal starts near Palla village near Delhi, and was to transfer Haryana's share of 3,500,000 acre feet (4.3 km3) from Indus Basin, though state of Haryana has completed its portion, Punjab is against its construction, and the state legislature passed the "Punjab Termination of Agreement Act 2004", which declared earlier agreements null and void.
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