Question

If A1 represents the area of a tank bed at bottom and A2 is the area of the tank at F.T.L, then the storage capacity of the tank of height H is given as ________________________

(a) H [A1 + A2 + A1.A2]

(b) H/2 [A1 + A2 + A1.A2]

(c) H/3 [A1 + A2 + A1.A2]

(d) 2H [A1 + A2 + A1.A2]

I had been asked this question in quiz.

Question is taken from Tank Irrigation topic in portion River Navigation & Tank Irrigation of Irrigation Engineering

Answer 1

The correct option is (c) H/3 [A1 + A2 + A1.A2]

The explanation is: The effective cubic content of the tank may be computed as H/3 [A1 + A2 + A1.A2] where H is the height or difference in elevations between F.T.L and the sill level of the lowest sluice. This is based on the assumption that the water stored is in the shape of a frustum of a cone.