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Abstract The article is devoted to the structural characteristics, principles of operation, and shortcomings of devices used to restore river channels that have lost their natural stability. It was determined that, the constructions of known sewage treatment plants are complex and their construction requires a large amount of construction materials, funds, and labor. Considering this, a drainage amelioration device called a light structure bottom net was developed. The proposed installation consists of a reinforced steel grid, tensioned steel cables, small pile supports, and connecting fastening elements. The article also proposed a calculation method for determining the recovery period of the damaged duct. It was determined that, flood flows play a very large role in the process of rehabilitation. Thus, it is possible to restore the river channel with a length of 4500 m, a width of 30 m, and a deformation depth of 9 m due to the bottom net within 7 hours due to the flood. However, in the normal case, that is, in the absence of flood flow, it takes 37.1 years to restore the channel.