The loss of soil by erosion occurs where run-off water are not obstructed by forest growth. Silt, sand, and every other kind of soil are swept from their natural positions and robbed by the foaming waters as they surge down the steep slopes. The stream or river which is flooded by these rushing waters roars down its large channel, tearing loose and undermining the jutting banks. In some cases, it will break from its ordinary course to flood exposed fields and to carry away more soil. As the speed of the flow increases its power to steal soil and carry it off is increased. Experts report that the carrying power of a stream is increased 64 times when its rate of flow is doubled. If the flow of a river is speeded up ten times, this raging torrent will be able to carry one million times as much foreign material as it did when it was flowing at a normal rate of speed, causing inexpressible losses and destruction of life and property.