Concept:
• Most Harappan sites were located in semi-arid lands, making irrigation a necessity for agriculture.
• Archaeological evidence suggests that different regions employed different water-management strategies based on their specific environment.
Step 1: Analyzing the geographical context of Shortughai
Shortughai was a Harappan outpost in a region that was significantly more arid than the heartland of the Indus Valley.
To sustain agriculture in such a dry climate, the Harappans constructed elaborate canal systems to divert river water to their fields, traces of which are still visible today.
Step 2: Evaluating the absence of canals in Punjab and Sindh
Archaeologists suggest two main reasons for the lack of canal traces in Punjab and Sindh.
First, these regions generally received higher rainfall compared to the extremely arid Shortughai, potentially reducing the reliance on massive canal networks.
Second, it is highly probable that ancient canals in the alluvial plains of the Indus silted up over thousands of years, making them invisible to modern surface surveys.