Which Mughal ruler repaired the Shahnahr in the Punjab?

NCERT (2026-27): “1.3 Irrigation and technology … Irrigation projects received state support as well. For example, in northern India the state undertook digging of new canals (nahr, nala) and also repaired old ones like the shahnahr in the Punjab during Shah Jahan’s reign. Though agriculture was labour intensive, peasants did use technologies that often harnessed cattle energy. One example was the wooden plough, which was light and easily assembled with an iron tip or coulter. It therefore did not make deep furrows, which preserved the moisture better during the intensely hot months.…”