Dependence of actual filling level of gravity flow water distribution on sediment thickness in benching part of pipes

The regulatory requirements of SP 32.13330.2018 (Sewerage. Pipelines and wastewater treatment plants) set the minimum sewage velocity in water distribution systems, depending on the highest filling level of pipes. It is known that during the operation of gravity flow water distribution systems under certain conditions, a layer of internal sediments might be formed, which increases the filling level of pipes and changes the values of the hydraulic characteristics of the flow. The study suggests the dependence between the values of hydraulic characteristics of the flow and the amount of internal sediments on the surface where the sewage flows. The authors introduced the calculated dependencies for hydraulic calculation of gravity flow water distribution systems with sediments on the surface where the sewage is moving. The study confirmed the dependence of the actual filling level of gravity flow water distribution systems on the amount of sediments on the surface. A specific example confirming the existence of such a dependence was given. The paper presented a graph of dependence between actual filling level and sediment thickness in benching part of pipes. It was shown that during the operation of gravity flow water distribution systems with internal sediments it is necessary to control the value of the actual filling of pipes 𝐻ф 𝑑пр and the amount of sediment in their benching part ℎ, which have a significant impact on the values of the hydraulic characteristics of the sewage flow.

1. Prodous O.A., Shlychkov D.I., Abrosimova I.A. Justification of the need for the hydrodynamic cleaning of gravity water discharge networks. Vestnik MGSU = Vestnik MGSU. 2022;17(1):106-114. https://doi.org/10.22227/1997-0935.2022.1.106114. (In Russ.).

2. Prodous O.A., Shlychkov D.I. Forecasting continued operation of gravity drainage networks with deposits in pipe water troughs. Izvestiya vuzov. Investitsii. Stroitel'stvo. Nedvizhimost' = Proceedings of Universities. Investment. Construction. Real estate. 2021;11(4):646-653. (In Russ.). https://doi.org/10.21285/2227-2917-2021-4-646-653.

3. Prodous O.A., Shlychkov D.I. Dependence of the actual flow rate in gravity sewerage networks on the thickness of the sediment layer in the tray part of the pipes. Tekhnologii ochistki vody «TEKhNOVOD2021»: materialy XIII Mezhdunarodnoi nauchnoprakticheskoi konferentsii = Water purification technologies "TECHNOVOD-2021": materials of the XIII International Scientific and Practical Conference. 1417 December 2021, Sochi, Krasnaya Polyana. Novocherkassk: PC «Lik»; 2021. p. 101-104. (In Russ.).

4. Yakovlev S.V., Kalitsun V.N. Self-cleaning sewer network. Vodosnabzhenie i sanitarnaya tekhnika = Water Supply and Sanitary Technique. 1970;7:4-7. (In Russ.).

5. Chupin R.V., Shishelova T.I., Bober A.A. Thepressure – non-pressure movement of drains in ring systems of water removal. Fundamental'nye issledovaniya = Fundamental Research. 2012;116:1480-1486. (In Russ.).

6. Prodous O.A., Shlychkov D.I. A device for measuring the thickness of deposits in a pipe. Patent RF, no. 207822; 2021. (In Russ.).

7. Prodous O.A., Shlychkov D.I. Parkhomenko S.V. Liquid level measuring device. Patent RF, no. 2022102567; 2022. (In Russ.).