Coefficient of roughness(Manning's n)
Mean fluid velocity
Volume flow rate
Area of flow
depth of flow
Hydraulic mean radius
Flow area A(m)/Wetted perimeter P
wetted perimeter 2h 2 x 0.300
slope of energy line sin 0(yo
Distance between level measurements
Upstream depth of flow
Downstream depth of flow
Note:For simplicity the slope s can be assumed to be the slope of the water surface if the small change in the velocity head between inlet and outlet is ignored. When using the flume with the be inclined, the slope ofthe must be added to calculations of S when using the hook and point gauges which use the bed as a datum