The water required for firefighting (known as fire-demand) may be computed using National Board of Fire underwrites formula given as
Q = 4637 \(\rm \sqrt{P}\) (1 - 0.01 \(\rm \sqrt{P}\)) where
1
Q = quantity of water in m3/s and P is more than 2,00,000
2
Q = quantity of water in L/min and P is more than 2,00,000
3
Q = quantity of water in m3/s and P is less than or equal to 2,00,000
4
Q = quantity of water in L/min and P is less than or equal to 2,00,000