Olive grove in hills of Andalucia, Spain, showing basins to collect and contain precipitation (1992).

One of more than 130 check dams built by the U.S. Forest Service in Alkali Creek, Colorado, in the 1960's (1989).

Forest service crew constructing watershed retention, Wasatch Mountains, Utah, 1933

Large beaver dam in Trout Creek watershed, in Western Colorado (1989)

Agricultural terraces in the Himalayas, Uttar Pradesh, India (1993)

Ancient agricultural terraces in Pisac, Cuzco, Peru (1995).

Panoramic view of Old Severance reservoir at Camp Creek, Oregon (2004).

Restored Clark's Creek, in Plumas County, California.

Discharge of treated sewage at the sediment retention basin in Tijuana (2002).

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