In 1982, an Arizona couple began building what became about 20,000 small rock dams across their desert ranch; one study found stream water increased 28% and flowed four weeks longer

A rancher’s simple fix of placing rocks in a wash initiated a significant land restoration process. Thousands of small rock dams, known as trincheras, were built over a decade on El Coronado Ranch. These structures slowed monsoon water, allowing it to seep into the soil and promote plant growth. Scientific studies later confirmed these dams increased stream volume and extended flow into dry seasons.
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