Fire demand estimation: Which is considered the most satisfactory formula for estimating the fire demand (Q) for an Indian city of population P (in thousands)?

Introduction / Context:
Estimating fire demand is an essential part of designing a water supply system. Different empirical formulas exist, but for Indian conditions, Freeman’s formula is considered the most satisfactory.

Given Data / Assumptions:

• Population of city: P (in thousands).
• Fire demand: Q (litres per minute).
• Empirical formulas vary by country and conditions.

Concept / Approach:
Freeman’s formula is adapted for Indian urban conditions. It estimates fire demand considering both population size and density of development.

Step-by-Step Solution:

Verification / Alternative check:
CPHEEO (Central Public Health & Environmental Engineering Organisation) guidelines recommend Freeman’s formula for Indian water supply design, validating this choice.

Why Other Options Are Wrong:

• Kuichling’s formula: Used in the USA, less suited to Indian densities.
• Buston’s formula: Applied in limited contexts, not standard in India.
• NBFU formula: A US standard, not adopted in Indian codes.
• None of these: Wrong because Freeman’s formula is accepted in India.

Common Pitfalls:

• Assuming any international formula applies universally.
• Confusing fire demand with per capita domestic demand.

Final Answer:
Freeman’s formula