A sewage from a town is to be carried away through a sewer pipe of diameter 30 mm. The specific gravity of sediment particle is 2.34 and the frictional factor for the given combination is 0.25. Calculate the minimum self-cleansing velocity (in m/s) required to be maintained through the pipe having a sediment coefficient of 0.50 such that there is no sediment deposition along the periphery for even the largest particle of grain size 30 mm.