Mean Depth Calculation  

Area of Section Flow :
A = h_{m}*T
Top Water Surface Width :
T = A/ h_{m}
Where,
h_{m} = Mean Depth,
A = Area of Section Flow,
T = Top Water Surface Width.
Example:
Calculate the Mean depth of water in a stream by the given details.
Area of Section Flow (A) = 25 m^{2}
Top Water Surface Width (T) = 20 m
Solution:
Apply Formula:
h_{m} = A/T
h_{m} = 25/20
Mean Depth (h_{m}) = 1.25 m