In the US, the famous Grand Canyon (Grand Canyon) at the time turned into a large lake. To restore the ecosystem of the Grand Canyon, it was decided to temporarily fill it with water. Water is supplied at a rate of 13,000 cubic meters per second. For comparison, this is enough to fill 20 minutes the highest skyscraper in New York - Empire State Building.
Grand Canyon (Grand Canyon) - the world's largest canyon depth of about 1,600 m. And a length of more than 320 km. in the middle reaches of the Colorado River cutting through the Colorado Plateau in Arizona). Water enters the four pipes from the reservoir, located above the dam spanning the Colorado River. Three days later, the water level in the canyon rise to four meters, and then rise from the bottom of the Colorado yl needed to restore sandy beaches.
Prior to that artificial flooding Canyon held twice - in 1996 and 2004. To restore the ecosystem to fill the canyon needed every one to two years.