Which year range best represents a long-range planning horizon for a water system's source of supply?

Which year range best represents a long-range planning horizon for a water system's source of supply?

• A. 10-20 years
• B. 25-50 years
• C. 60-80 years
• D. 5-10 years

Answer: (B)

Long-range planning for a water system's source of supply requires looking decades ahead because major changes in water availability and the infrastructure to support it take many years to implement. Developing or securing a new source, building storage, treatment, and transmission facilities, and navigating permitting and financing all span lengthy timelines. A planning window of decades—roughly 25 to 50 years—gives a realistic horizon to anticipate population growth, climate variability, regulatory shifts, and the time needed to study, fund, design, and construct large projects. Shorter horizons focus on near-term operations and upgrades, while extremely long horizons become increasingly uncertain for budgeting and decision-making. So, 25-50 years best represents the long-range planning horizon for a water system’s source of supply.

Long-range planning for a water system's source of supply requires looking decades ahead because major changes in water availability and the infrastructure to support it take many years to implement. Developing or securing a new source, building storage, treatment, and transmission facilities, and navigating permitting and financing all span lengthy timelines. A planning window of decades—roughly 25 to 50 years—gives a realistic horizon to anticipate population growth, climate variability, regulatory shifts, and the time needed to study, fund, design, and construct large projects. Shorter horizons focus on near-term operations and upgrades, while extremely long horizons become increasingly uncertain for budgeting and decision-making. So, 25-50 years best represents the long-range planning horizon for a water system’s source of supply.