Given: Height of rain water =5cm Area of ground =2 hectares =2×108cm2 Concept used: Volume = Area of base × Height 1 hectare =100000000cm2 or 108cm2 1cm=1∕100m or 1∕102m lculation: Volume of water that falls on the ground =2×108×5 ⇒10×108cm3 ⇒109cm3 Now we need to convert it into m3 ⇒109×(1∕10)6m3[∵{(1∕10)2}3=(1∕10)6] ⇒103m3 ⇒1000 cubic meter ∴ The volume of water that falls on 2 hectares of ground is 1000 cubic meters.