Question

The waterway for a bridge on the river in alluvial plain having a dominant discharge of 3600 cumecs should be ________ m.

(a) 250 m

(b) 285 m

(c) 300 m

(d) 225 m

I got this question in an interview for job.

I'm obligated to ask this question of Culverts Construction topic in portion Culverts and Small Road Bridges Construction of Irrigation Engineering

Answer 1

The correct answer is (b) 285 m

To explain I would say: The linear waterway of a bridge across a purely alluvial stream is equal to its regime width as given by Lacey.

W = L = 4.75 Q^1/2 = 4.75 x 60 = 285 m.