Forecast of population for water supply is done using

U.K. Combined A E Paper II 2012

⭕ (a) Arithmetic Mean Method

⭕ (b) Comparative Method

⭕ (c) Graphical Method

⭕ (d) All the above

Explanation: Forecasting population is essential for water supply planning. All the listed methods are valid. Here are the commonly used ones:

• Arithmetic increase method
• Geometric increase method
• Method of varying increment
• Decreasing rate of growth method
• Simple graphical method
• Comparative graphical method
• Master plan or zoning method
• Logistic curve method

These methods help predict future population to ensure adequate water supply infrastructure.

Population Forecasting Methods in Water Supply

Forecasting population is a crucial step in the design and planning of water supply systems. It helps estimate the future water demand of a city or area.

Why It’s Important:

• Helps in planning for future urbanization.
• Ensures proper sizing of pipes, reservoirs, and treatment units.
• Reduces the risk of shortages and system failures.

Conclusion:

The correct answer is All the above. All three — arithmetic, comparative, and graphical — are part of multiple standard forecasting methods used in engineering and urban planning.