A flat roof has rain water on it 150 mm deep. What is the load on the roof,in kN/m2, due to the water?

Answer 1

The density of water is 1000kg/m cubed. That's 1000kg for every 1m² of water at 1m deep.

So 1m² of water at 150mm deep would be 1000 x 0.15 = 150kg

So the load is 150kg/m², that's equivalent to 150kg/m² x 9.81N = 1470.15N/m², or 1.4715kN/m².

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For a flat roof to have 150mm deep standing water, it's either a badly designed roof or the drainage needs to be checked out.

Answer 2

The volume of water on the roof = Area * Height = 0.15 * A m^3
where A = area in sq meters
Density of water = 1000 kg/m^3; Weight on roof = 0.15 * A * 1000 kg = 0.15 * A * 1000 * 9.81 N;
Load on roof in kN/ m^2 = .15 * 9.81 = 1.47

Answer 3

There are 150liter per sqare meter .If the weight of each liter is
9.8 N the load is 9.8*150/1000 kN/m^2 =1.47 kN/m^2

Answer 4

1.4715 kN/m2

Answer 5

1.4715 kN/m2