Selle quietly gurgling little river in the gorge, sometimes even a trickle.

And do not believe that this peaceful creek does not cost anything to become a ruthless "roaring beast." But here the case of sharp rise of water, flooding caused by heavy rains or rapid melting of snow somewhere in the upper reaches. And the stream is no longer a stream, a roaring, sweeping away in its path, muddy silt, sand and soil flow. Rocks and boulders, which he had carefully wrap, now getting up and rattled in a mad rush whirlpool. That's trickle turns into rural areas. "Sel" - the Arabic word and translates it as "a raging torrent." What is rural well-known in many regions of India and China, Turkey and Iran. He brought a lot of troubles residents of mountainous regions of western coast of North and South America. In March 1938, in the foothills of the American Cordillera, near Los Angeles, was a powerful downpour. Water is immediately filled the valleys dried up rivers and streams. Not yet managed to finish a downpour, as in the valley rushed unaware restraint mudslides. They are rooted trees, twisted, turned boulders weighing dozens of tons, carried a mass of dirt and rubble. Mudslides destroyed encountered on their way home, railways and bridges. Killed two hundred people. Devastating mudflows are frequent guests in the Austrian Alps. Here the case of debris flows, which reach heights of eighteen meters. That was so rural in 1981. That summer in the mountains it is very sharp warming and rapid mountain streams became raging, muddy and sat down. From the canyons to the valley rushed terrible, up to 10 meters mudslides. Roaring avalanche dragged from a huge stone boulders, uprooted trees and even a small wooden structure. Raging stream dammed a narrow neck of the gorge and pulled a large metal railway bridge, stretched across the gorge. Enraged flow dragged mangled parts of the bridge a few hundred meters down and scattered over the stones. In some cases, the cause of the mudflow are not themselves bystrotayuschie rains and snow and glaciers in the mountains and mountain lakes. In 1941, in the middle of summer quickly began to melt glaciers in the Andes Ieruanskih. Meltwater quickly overflowed several alpine lakes. One of them, Palkochacha, his entire output has fallen on the city Uaros. The victims were 6000 people.