Assertion (A): Punjab, Haryana, and western Uttar Pradesh are experiencing a significant groundwater depletion crisis primarily driven by over-extraction for irrigation, essential in these agriculturally vital areas.
Reason (R): Groundwater usage for irrigation demonstrably exceeds water-table recharge rates. This persistent over-extraction, particularly in areas with intensive agriculture, causes a rapid decline in water levels, fueling the groundwater depletion crisis.
Therefore, both Assertion (A) and Reason (R) are accurate, and Reason (R) accurately substantiates Assertion (A).