Concept:
• The Mughal state took a keen interest in agricultural expansion and irrigation projects.
• Canals, often called 'nahars', were constructed or repaired to ensure the productivity of the land, especially in the arid regions of Punjab and Haryana.
• One of the most famous irrigation projects was the Shah Nahar (Royal Canal).
Step 1: Identify the historical origin of the canal
The canal system in the Punjab region had roots in the Tughlaq period, specifically under Firoz Shah Tughlaq.
Over time, many of these canals became silted and non-functional due to neglect.
Step 2: Examine the Mughal repair efforts
During the 17th century, the Mughal administration undertook massive restoration projects.
The canal that took off from the Ravi river to irrigate the Bari Doab was extensively repaired and extended.
Step 3: Pinpoint the specific reign
Historical accounts like the 'Ain-i-Akbari' and later chronicles mention that this canal was repaired during the reign of Shahjahan.
His reign is noted for architectural grandeur as well as significant infrastructure works aimed at enhancing state revenue through improved agriculture.