Question

Which of the following statement is wrong about the internal silting method?

(a) The extra strength is gained by increasing the section of the banks

(b) The additional soil is derived from the natural process of silting internally

(c) This method of strengthening the canal is very cheap, simple and efficient

(d) To decelerate the silting process low submersible spurs may be constructed

This question was posed to me in an international level competition.

The question is from Irrigation Canal in division Sediment Transport and Irrigation Channels Design of Irrigation Engineering

Answer 1

Correct option is (d) To decelerate the silting process low submersible spurs may be constructed

Explanation: The spurs project into the canal section from the banks. They provide high silting rate and spurs may be raised after silting has taken place up to the top of spurs. Thus silting takes place in successive layers and finally, silt deposit reaches a predetermined height which is then raised up to the top of the bank.