Question

Find the discharge through a rectangular orifice 2.2 m wide and 1.3 m deep fitted to a easier tank. The water level in a team is 2.5 m above the top edge of orifice.

(a) 13.9 m^3/s

(b) 11.5 m^3/s

(c) 16.9 m^3/s

(d) 8.7 m^3/s

This question was addressed to me in an interview.

My doubt is from Flow through Large Orifice in chapter Orifices, Mouthpieces, Notches and Weirs of Fluid Mechanics

Answer 1

The correct option is (a) 13.9 m^3/s

For explanation I would say: Q = 2/3 Cd *b*√2g* (H2^1.5 – H1^1.5)

                       Here,

                       H1 = 3.8

                       H2 = 2.5

                       b = 2.2

Hence, Q = 13.9 m^3/s.