TY JOUR TI Dependence of Hydraulic Characteristics of Gravity Sewer Pipelines on the Method of Trenchless Repair KW Operation KW gravity sewer pipelines KW reconstruction KW trenchless repair KW hydraulic characteristics JO Proceedings of Petersburg Transport University AU Petrov, V.M. AU Terehov, L.D. PY 2023 IS 20 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"