Question

When does the alignment depicted by the following diagram used?

(a) To Maintain Proper Energy Dissipation

(b) To Control Velocity of the Flow

(c) To Control Hydraulic Jump

(d) To Avoid Silt Accumulation

The question was asked during an interview for a job.

The origin of the question is Canal Regulation in chapter Regulation Modules and Canal Structure of Irrigation Engineering

Answer 1

The correct choice is (d) To Avoid Silt Accumulation

The explanation: The transitions from the main channel to the off taking channel have to be designed properly so as to avoid the accumulation of silt or say silt jetty. So therefore to serve as an alternative to the transitions both the channels have to make an angle with the parent channel upstream of the off take.