Research on Methodologies of Draining and Decompressing for Pipe Network in Lining Channels

It´s required to decompress with the draining pipe network when there is a relatively high groundwater level outside of the lining channels. The self-draining pipe network is composed of longitudinal collecting underground pipes, transverse communicating pipes and non retern drain valves. The pipe flow might be laminar flow or turbulent flow determined by the discharge. The turbulent flow might be in the hydraulically smooth region, hydraulically transition region or hydraulically rough region. When the pipe flow is laminar flow, the equation set for solutions is linear which can be calculated in finite element method with no iterative computations; When the pipe flow is turbulent flow, the equation set for solutions is non-linear which can be calculated in finite element method with iterative computations.