Purpose: to solve the problem of conservation and reproduction of fish stocks of valuable commercial fish species in natural reservoirs. on the example of performing one of the tasks of developing a facility for regulating water regime of the ilmen part of the Volga delta. Using the well-known formulas of hydraulics. scientific developments of scientists in the field of hydraulic engi... https://bellfordtoysandhobbiers.shop/product-category/armored-vehicle/