Civil Engineering - Irrigation - Discussion

All the above.

Attracting groynes point downstream, serving to attract the stream flow toward themselves and not repel the flow toward the opposite bank. They tend to maintain deep current close to the bank.

Deflecting groynes change the direction of flow without repelling it. They are generally short and used for limited, local protection.

Repelling groynes point upstream; they force the flow away from themselves. A single groyne may have one section, for example, attracting, and another section deflecting.

Yes, I agree with you @Subin. But angle should be between 60-75 degree.

As per the question, the correct answer should be [D]

If [B] be the answer then the question should be "Repelling Groynes are generally built at?

I also agree @Subin Sekhar.

The correct answer should be all of the above.

I also agree @Subin Sekhar.

According to me, the answer is D.

Ans B is correct because it shows that it is repelling Groyne which is designed at an angle 60 to 80 degree to upstream.

i.e. 10-30 degree normal to the river bank.

Answer is D, All the above are correct.

If it is B then what about the option A? it also be right.