Roorkee University, Roorkee, U.P.
Factors affecting drag on a large geometrical roughness object in open channel flow have been determined by dimensional analysis. For a cube roughness relations in Froude number, Reynolds’ number, relative submergence and drag coefficient have been studied. Concept of a modified Froude number combining Froude number and relative submergence, has been presented, which gives a good correlation in drag coefficient, modified Froude number and Reynolds’ number for a cubical roughness in open channel flow.
