Beaver lodge in dammed pond, Ogilvie Mountains, Yukon, Canada, North America

Perito Moreno glacier (25 km long, 2 km wide), has almost dammed the Tempano channel, Patagonia, Argentina, South America

The 2400 megawatt Navajo Generating Station. It's coal fuel comes from Kayenta Mine and cooling water from the nearby dammed Lake Powell. One of the top ten US generators, Glen Canyon, Arizona, USA

The old road revealed by drought in Loch Glascarnoch near Ullapool, Scotland, United Kingdom, Europe

Achanalt hydro electric power station in Scotland, United Kingdom, Europe

Lake Mulwala at Yarrawonga was created when the Murray River was dammed to provide irrigation water for surrounding farmland, Victoria, Australia, Pacific

Lake Mulwala at Yarrawonga was created when the Murray River was dammed to provide irrigation water for surrounding farmland, Victoria, Australia, Pacific

The old road revealed by drought in Loch Glascarnoch near Ullapool, Scotland, United Kingdom, Europe

The parallel roads of Glen Roy caused by an ice dammed lake during the last Ice Age that left rings around the glen indicating the lake levels, Scotland, United Kingdom, Europe

Lake Mulwala at Yarrawonga was created when the Murray River was dammed to provide irrigation water for surrounding farmland, Victoria, Australia, Pacific

Barrage of an old canal