CONSTANT VELOCITY OPEN CHANNEL FLOW

Abstract

Open channels are required to handle variable discharges which may range from a certain minimum to a very large value. This makes channels vulnerable to large fluctuation of velocity which necessitates a channel section having constant velocity at all depths. Such channel would prove to be useful in case of large sewers. In the present study a channel shape is obtained which gives constant velocity at higher stages. It also has been possible to obtain explicit equations for critical depth, normal depth, end depth, transitional depth, sequent depth ratio and critical slope using dimensionally consistent resistance equation which involves surface roughness and viscosity as variables and thereby eliminating the use of Manning's n.