No wonder they say that you ...

No wonder they say that you can not enter into the same river twice. The rivers continuously raise the level of bottom sediments. The movement of water erodes the banks in its continuous flow, but most of the bottom melts in floods, when water washes into the river everything that lies on the coastal territories - loose soil, sand, clay, various objects and masses of waste human activity. These accumulations most of all gather below the settlements, forming underwater dams
      The outflow of water from the coast occurs, mainly, in such places. They are invisible from the land, but the capacity of rivers decreases within and below towns and cities along the current. Therefore, floods and heavy precipitation are flooding with the destruction of buildings, roads and everything else.
           If these submarines are removed, the water outflow from the shores, at least, will move downstream, beyond the boundaries of populated areas.
       It is possible to plan in advance the places of floods and to take them away from habitation and constructions.
       Existing technologies of dredging are based on excavation, bulldozer cleaning, suction and dredging with expensive serial equipment, large financial and material costs. Modern dredgers with a capacity of 100 - 800 kW, as well as their lease are not available to every coastal economy.      

        Developments have been developed that use the forces of the river to form the river bed and river bed, within specified limits, with specified depths for passing ships, with straightening bends, and controlling water flow. There are possibilities of influencing the flow by simplest means. Manufacture and operation of such facilities are available to small coastal farms that suffer from floods, collapse of shores, shallowing of fairways.
        Work to deepen the rolls should be started during and immediately after floods - with strong water movements to prevent floods next year. In the low period, in the summer, the effectiveness of such work is reduced because the water flows in the rivers are decreasing, and some rivers are completely dry.
        The proposed method of influencing bottom sediments by the current itself is based on the constraint and control of part of the stream to influence bottom sediments. Devices change and concentrate river flows, without requiring outside energy. The technological process is carried out by concentrating and directing a part of the stream to pre-selected places of the channel, creating erosion and deposition zones of bottom sediments. Depending on the parameters of the river, the devices are controlled from the shore by cables or supplemented with mobile transport means. Structurally, the devices depend on the thickness of the streams, the width and depth of the river.
          New facilities can affect the bottom and coast without using energy sources. Passive devices made of shields, reinforced and controlled by cable block systems or mobile means, can straighten river beds in pre-designed forms.
       A device has been developed that can stand firmly on the bottom and control the flow of water. A device to change the buoyancy and sail, ensure its free movement on the surface of the water.
          Tests of individual elements of micromodels of the proposed device on small rivers and trays were conducted, which showed the result.
         Design work and tests are needed to test and demonstrate the effectiveness of the new method in full-flow river conditions. The first experience on a natural object can start a widespread deepening of the rifts on all rivers where floods occur and warn them in the near flood.
      The designs of such devices are developed for each type of water body. From shallow rivulets to great rivers, such as the Irtysh, the Urals, the Mississippi and the Amazon.
         The proposed devices can save water from spreading and fumes, narrow deltas, restore shipping.
       To save water for the summer period, it is customary to build reservoirs based on dams and dams. Practice shows that abnormal precipitation leads to the breakthrough of such dams and floods.
        Strategically building reservoirs, by damaging rivers with dams, is a crime against nature and a high risk of flooding when dams are destroyed. To save water in a low water, it is enough to deepen the stretches - the existing depths. Over time, the bottom is filled with silt. To prevent floods and save water in the dry season, it is necessary to deepen the depths all along the river. Deepening to create much more voluminous than natural, up to 200 - 1000%, and also it is possible to expand such places within reasonable limits to the extent possible in each specific place, for example, in floodplains. Thus, it is possible to accumulate the necessary volumes of water in artificially created depressions not only in the upper reaches, but also along the entire river. The proposed devices can perform such works more efficiently than the known dredgers. Perhaps, on some rivers you can t increase bottom filtration. In such rivers it is possible to reduce it by layers of clay.