But because factories were allowed to -- allowing warm water to run back into the river, the temperature was becoming too high for the salmon to survive.

WHITEHOUSE: President Obama Speaks at Conference on Conservation

Icy water from a nearby river then cools the gas back to liquid form, to start the cycle again.

ECONOMIST: Geologists are getting more juice out of the ground

After summiting the craggy Ragged Jacket, 2, 462ft, and 2, 782ft-high Mount Meader's sparsely pine-covered crest without finding a water source, we needed to get back down to Wild River as soon as possible to refresh and refill.

BBC: Share this page

He said the floodwater had deposited a bank of soil in the channels they had built to take water away from the turbine and back into the River Rea.

BBC: Shropshire

The international community in the U.S. - one of the things we've seen is the way that the city is flooded is there is some form of machinery, some form of equipment that they could bring in, similar to like FEMA, to help get a lot of the water out of the town and back into the river.

NPR: Wyclef Jean Describes Haiti's Devastation

But Hurricane Katrina's winds pushed in a devastating surge of water from the Gulf of Mexico that overwhelmed the city's system of levees built to hold back the surrounding Mississippi River and Lake Pontchartrain.

CNN: Storm surge the fatal blow for New Orleans