Question

In Francis formula, the effective length is –

(a) L-0.2H

(b) L-0.4H

(c) L-0.3H

(d) L-0.1H

The question was posed to me by my college professor while I was bunking the class.

This question is from Time Required to Empty a Reservoir with  Weirs or Notches in section Orifices, Mouthpieces, Notches and Weirs of Fluid Mechanics

Answer 1

Right choice is (a) L-0.2H

The explanation is: In Francis formula, the effective length is L-0.2H.