Answer
Heavy irrigation in a drainage basin can significantly influence the flow of a river. When large amounts of groundwater are pumped for irrigation, it can lead to a lowering of the water table, which can, in turn, reduce the flow of the river. The excess water extracted from the aquifers for irrigation reduces the amount of water available to recharge the river, decreasing the base flow. Additionally, in some cases, excessive irrigation can cause surface runoff to be reduced, which further impacts the river's flow during drier periods. Overall, heavy irrigation can alter the natural balance of water in the drainage basin and affect the river's flow and water availability downstream.
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