Correct Answer - Option 2 : 1.5
Explanation:
For water supply to a medium town, the daily variation factor is 1.5. Consumption of water required by municipal uses depends on two data, first is the rate of water consumption and quantity of water which is supplied to the population. The daily variation depends on the quantity of water which is used by the people on Sundays and during festival days.
The percentage ratio of maximum demand to the average demand can be computed using Good Rich equation;
p = 180×t-0.10
where
t = time(days)
Demand |
Fluctuation |
Hourly |
2.7 |
Daily |
1.8 |
Weekly |
1.48 |
Monthly |
1.28 |
Yearly |
1 |
Fluctuation in hourly demand is also termed as Peak factor which depends upon the population as follows;
Population |
Peak factor |
< 50000 |
3 |
50000 - 200000 |
2.5 |
> 200000 |
2 |