The 'design period' for water supply infrastructure components is:
Choose the correct answer
Always 5 years for all components
Varies by component: major dams 50–100 yr; treatment plants 15–30 yr; distribution mains 20–30 yr
100 years for all without exception
Only 1 year (annual planning basis)
Correct Answer
B. Varies by component: major dams 50–100 yr; treatment plants 15–30 yr; distribution mains 20–30 yr
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Design periods vary by component: (1) Major dams and tunnels: 50–100 years; (2) Treatment plants: 15–30 years (can be extended); (3) Pumping mains: 30 years; (4) Distribution network: 20–30 years; (5) Service reservoirs: 15–30 years. Future population estimated for design period using growth rate. Staggered design based on phasing.
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