A catchment area has 25% each of watertight roofs (impermeability factor = 0.9), areas with many buildings (impermeability factor = 0.8), Gardens ((impermeability factor = 0.1) and forest land (impermeability factor = 0.05) What is the average impermeability factor for the area?

A catchment area has 25% each of watertight roofs (impermeability fact

1.	A catchment area has 25% each of watertight roofs (impermeability factor = 0.9), areas with many buildings (impermeability factor = 0.8), Gardens ((impermeability factor = 0.1) and forest land (impermeability factor = 0.05) What is the average impermeability factor for the area?
A.	0.050
B.	0.900
C.	0.800
D.	0.463
E.	0.450
Answer» E. 0.450

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A catchment area has 25% each of watertight roofs (impermeability factor = 0.9), areas with many buildings (impermeability factor = 0.8), Gardens ((impermeability factor = 0.1) and forest land (impermeability factor = 0.05) What is the average impermeability factor for the area?

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