Civil Engineering - Water Supply Engineering - Discussion

Discussion Forum : Water Supply Engineering - Section 1 (Q.No. 13)
13.
Distribution mains of any water supply, is normally designed for its average daily requirement
100%
150%
200%
225%.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
24 comments Page 1 of 3.

Sheikh Ovais Ahmed said:   4 years ago
225% is correct.

Water mains are Designed for a maximum of ( Max hourly demand or Coincident draft).

Maximum hourly demand = 270% of av hourly demand (i.e. 2.7 * Qav).
Coincident Draft includes Maximum daily demand which is 180% of Average daily demand (i.e. 1.8 * Qav).

Thus we take an average of these two (270+180)/2 = 225%.

I hope this is clarified.
(22)

Moyir said:   4 years ago
For daily it's 180%, for hourly it's 150%, for monthly it's 140%.
(1)

Sheikh Ovais Ahmed said:   4 years ago
225% is correct.

Water mains are Designed for a maximum of ( Max hourly demand or Coincident draft).

Maximum hourly demand = 270% of av hourly demand (i.e. 2.7 * Qav).
Coincident Draft includes Maximum daily demand which is 180% of Average daily demand (i.e. 1.8 * Qav).

Thus we take an average of these two (270+180)/2 = 225%.

I hope this is clarified.
(1)

Vinay Kumar said:   7 years ago
Maximum daily demand = 1.8 x average daily demand.

Maximum hourly demand of maximum day i.e. Peak demand.
= 1.5 x average hourly demand.
= 1.5 x Maximum daily demand/24.
= 1.5 x (1.8 x average daily demand)/24.
= 2.7 x average daily demand/24.
= 2.7 x annual average hourly demand.
(1)

Neel said:   1 decade ago
Shouldn't it be designed for maximum hourly demand = 2.7 times average daily demand ?
(1)

Arpit Dubey said:   7 years ago
Maximum daily discharge is 1.5 of avg daily discharge.
And Maximum hourly discharge is 1.5 of maximum daily discharge. (OR). 2.25 of avg daily discharge.

Khan said:   3 weeks ago
Some guidelines suggest designing for up to 225% to incorporate the coincident draft (peak demand plus fire flow) for robust fire protection and future growth, especially in urban areas.

150% is a standard answer for peak demand, but 225% is used when factoring in fire demand, making it a more comprehensive design factor for overall system capacity.

Abhishek Das said:   5 years ago
If daily then 180% and if hourly then 150%.

Ashwani Kumar said:   6 years ago
The question is wrong.

Generally distribution system should be designed for maximum hourly consumption of maximum day i.e. Peak Demand or Coincident draft, whichever is more.

God-rich formula to find peak demand to an average demand ratio.

P = 180 x t^ (-0. 1)

Where P = percent of the annual average draft for the time 't' in days.

So, I think 180% is the right answer.

Chaman said:   6 years ago
Thanks everyone for explaining it.


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