People walking next to the resevoir in Central Park in winter with tall buildings of Central Park West in the background, New York City, United States of America, North America

Lanuza village and resevoir, with Sierra Tendenera range beyond, Tena Valley, Sallent de Gallego, Pyrenees, Huesca Province, Spain, Europe

Lanuza village, resevoir and dam and the Tendenera mountains, Tena Valley, Sallent de Gallego, Pyrenees, Huesca Province, Spain, Europe

The Glen Canyon Dam on the Colorado River, that generates power and forms Lake powell, the country's largest resevoir, Glen Canyon, Arizona, USA

Lake Powell in the Glen Canyon National Recreation area, the country's largest resevoir, formed by the The Glen Canyon Dam on the Colorado River, Glen Canyon, Arizona, USA

Reservoir Constructed In The 11Th Century, West Baray, Ankor, Cambodia

Reservoir Constructed In The 11Th Century, West Baray, Ankor, Cambodia

Grassholme Reservoir, County Durham, England; A Water Reservoir

Grassholme Reservoir, County Durham, England; A Water Reservoir