# Civil Engineering - Irrigation - Discussion

### Discussion :: Irrigation - Section 3 (Q.No.1)

1.

If the straight sides of a triangular section of a lined canal with circular bottom of radius D, make an angle θ with horizontal, the hydraulic mean depth is

 [A]. D [B]. D/2 [C]. D/3 [D]. D/4 [E]. D/5

Explanation:

No answer description available for this question.

 Narender Kumar said: (Feb 27, 2017) l think the option D is the right. m = d/4 in circular.

 Shiva said: (Sep 23, 2017) Correct answer is D/4.

 Nayan Ahir said: (Dec 12, 2017) It's for diameter. In this case, the radius is D.

 Partho Kole said: (Mar 15, 2018) D/2 is the right answer here. In this question, the radius is indicated by 'D', so don't take it as a diameter. Hydraulic mean radius is defined by the ratio of Area by the perimeter, if you put the right relation in between, you will definitely see the answer comes to D/2.

 Dhananjay said: (Mar 3, 2019) Yes, you are Right @Partho.

 Kajal Tomar said: (Oct 16, 2019) Actually it is irrigation canal having triangular sides and circular bottom and for such canal:- A = D"2 ( @ + cot@ )...........(1). P = 2D ( @ + cot@ )..................(2). therefore R = A/P = (1)/(2) = D/2. So option B is correct

 Ajay Kumar Yadav said: (Sep 4, 2021) D/2 is the correct answer.