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How can water diversion for irrigation cause a lake to shrink?

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lake Lake Ann in North Cascades National Park, Washington, U.S., viewed from the park's Maple Loop Trail. The North Cascades National Park is a large wilderness area that preserves majestic mountain scenery, snowfields, glaciers, and other unique natural features.

Lakes exist in a delicate hydrologic balance, relying on a steady inflow of water from sources like rivers and streams to offset losses from evaporation and outflow. When water is diverted from these feeder rivers for irrigation, the lake’s water budget is disrupted, leading to a decline in volume and surface area.12

A prominent example of this process is the Aral Sea. During the second half of the 20th century, the diversion of the Syr Darya and Amu Darya rivers to support agricultural projects in Central Asia deprived the lake of its primary water sources. As a result, the sea shrank to a tiny fraction of its original size, causing severe ecological and public health crises in the surrounding region.23

It is ethically imperative to recognize that prioritizing industrial or agricultural water consumption without regard for the integrity of natural watersheds can lead to catastrophic environmental degradation and human suffering.13