Correct Answer - Option 3 : 63,640 litres/min
Concept:
Calculating fire Demand:
a) Kuchling’s formula
Q = 3182 √p
Where, Q = Amount of water required in liter/minute.
P = Population in Thousand
b) Freeman’s formula: -
\(Q = 1136\left[ {\frac{P}{5} + 10} \right]\)
Where, Q = Amount of water required in liter/minute.
P = Population in Thousand
c) National Bard of fire under writer formula:-
i. For central congested High valued city
→ when population ≤ 2 lakhs
Q = 4637 √ p [1 – 0.01 √p]
Where, Q = Amount of water required in liter/minute.
P = Population in Thousand
→ when population > 2 lakhs.
Provision of 54000 liters/minute may be made with an extra additional provision of 9100 to 36000 liter/minute for a second fire.
ii) for residential Buildings
→ Small or low building = 2200 l/min
→ Larger or higher building = 4500 l/min
→ High valued residency = (7650 – 13500) l/min
→ Three story building
In densely built up area = up to 27000 l/min
d) Buston’s Formula: -
Q = 5663√ p
Calculation: -
According to Kuchling’s formula the fire demand is
Q = 3182 √P
Q = 3182 √400 L/min
∴ Q = 63640 L/min