0.65 kN/m2

0.75 kN/m2

1.35 kN/m2

1.50 kN/m2

± 0.2

±0.5

± 0.7

0

10 m

20 m

25 m

50 m

mean probable design life of structures

basic wind speed

both mean probable design life of structures and basic wind speed

none of the above

degree of permeability of roof

slope of roof

both (a) & (b)

none of the above