Flat drain pipes are a modern drainage solution. The flat profile increases the strength and rigidity of the pipe. The paper considers the experience of using flat pipes for drainage of territories in the whole world. A study of the dependence of the throughput of flat drain pipes on the slope was carried out, and a comparison was made with the throughput of round pipes. With the help of roughness, calculations of the throughput of flat and round pipes were made, and the low throughput of the

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... ction of a flat corrugated pipe compared to a round one was proved. A comparison of the efficiency of using pipes of different cross-sections is made using the example of wall drainage. The inexpediency of using flat drain pipes as wall drainage has been substantiated.