Question

With what equation we can calculate the berm width?

(a) (s1 – s2) d1

(b) (s2 – s1) d1

(c) (s2) d1

(d) (s1) d1

I got this question by my school principal while I was bunking the class.

Enquiry is from Cross-Section of an Irrigation Canal topic in chapter Sediment Transport and Irrigation Channels Design of Irrigation Engineering

Answer 1

Correct option is (b) (s2 – s1) d1

Best explanation: Berm is the horizontal distance between the toe of the bank and top edge of the cutting. If s2 : 1 is the slope in filling and s1 : 1 is the slope in cutting, and the initial depth of the berm from the bed of the canal is d1 then width of the berm is (s2 – s1) d1. As d1 varies, the width of the berm also varies. As siltation occurs the formula is (s2:1/2) y (y=over all new depth of the berm).