Correct Answer - Option 4 : Maximum daily demand and fire demand, or maximum hourly demand, whichever is higher.
The design life and design discharge for different units in raw water is given below:
|
Unit
|
Design Life
|
Design Discharge
|
|
Source –surface or subsurface reservoir/Dam
|
50 Years
|
Maximum Daily Demand (MDD)
|
|
Pipes carrying water from source to Water treatment plant
|
30 years
|
Maximum Daily Demand (MDD)
|
|
Pumps /canal
|
15 years
|
Maximum Daily Demand (MDD)
|
|
Water Treatment plant
|
15 years
|
Maximum Daily Demand (MDD)
|
|
Service Reservoir
|
15 years
|
Emergency Storage+ Fire Storage + Balance Storage
|
|
Pipes carrying water from service reservoir to distribution system
|
30 years
|
Maximum of { Maximum daily demand + fire demand, maximum hourly demand }
|
|
Distribution system
|
30 years
|
Maximum of { Maximum daily demand + fire demand, maximum hourly demand }
|
Note:
Maximum Daily Consumption = 1.8 × Average Daily Demand
Maximum hourly Consumption = 1.5 × average Hourly Consumption of Max Daily Demand
Maximum weekly Demand = 1.48 × Average weekly
Maximum monthly Demand = 1.28 × Average Monthly
