To find out manning's constant and chezy's constant practically in the Lab Both formulae are empirical, but the Manning formula is widely accepted as more accurate and is the base formula still in current use for all open channel flow analysis. Manning’s formula was proposed by Robert Manning (an Irish engineer) to calculate uniform flow in the open channels. It is probably the most widely used uniform-flow formula around the world. Its extensive usage is due to the following reasons: (i) The majority of open channel flows lies in the rough turbulent region; (ii) It is simple in form and the formula is well proven by much practical experience. Manning’s formula shall not be applied in situations where the Reynolds number effect is predominant. For the Chezy formula, it is less commonly used owing to insufficient information to find out equivalent roughness and it is not backed by sufficient experimental and field data. However, in smooth boundar
