# Civil Engineering - Water Supply Engineering - Discussion

### Discussion :: Water Supply Engineering - Section 4 (Q.No.45)

45.

The approximate diameter of a water mains for supplying 7.2 mld with a velocity 1.2 m/sec, is

 [A]. 24 cm [B]. 26 cm [C]. 28 cm [D]. 30 cm [E]. 32 cm.

Answer: Option D

Explanation:

No answer description available for this question.

 Pawan said: (May 26, 2016) According to me, the answer is 32.57cm.

 Simar said: (Aug 15, 2016) Answer is 29.73 @Pawan.

 Ashish Thakur said: (Sep 8, 2016) Hi @Simar, How is the answer 29.73?

 Paddy'S said: (Sep 12, 2016) @Ashish. Q = AV and 7.2 mld =0. 08334 m^3/sec. Now put the value and get the answer.

 Happy Bansal said: (Oct 12, 2016) But how is 7.2 mld equal 0.08334 m^3/sec?

 Happy Bansal said: (Oct 12, 2016) Now find 7.2 mld = 7.2 x 1000/1 x 24 x 60 x 60 = 0.08334 m^3/sec. Q = AV, 0.08334 = 3.14d^2/4 x 1.2. So, 0.08334 x 4/ 1.2 x 3.14 = d = 0.2966 m say 30 cm.

 Er. Baboolalmahawar said: (Jun 21, 2017) Q = 7. 2MLD = 7. 2 * 1000/(24*60*60) = 0. 08334 m3-sec. Then Q=AV; 0. 08334 =3. 14d2/4 *1. 2 d= 0. 2974m, d=29.74 = 30cm.

 Baboolalmahawar said: (Jun 21, 2017) 7.2 mld = 7.2 x 1000/1 x 24 x 60 x 60 = 0.08334 m^3/sec. Q = AV, 0.08334 = 3.14d^2/4 x 1.2. So, 0.08334 x 4/ 1.2 x 3.14 = d = 0.2966 m say 30 cm.

 Irshad Khan said: (Feb 25, 2020) Thank you @Baboolalmahawar.

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