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
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.
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.
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.
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.
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.
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.
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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