Question 1205443
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6.6mm of rain fall onto a rectangular roof 8m long and 6m wide. 
The rain water drains into a cylindrical barrel of diameter of 60cm. 
How far does the water level rise in the barrel?
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To find the water level rise in the barrel, take the volume of the rain

   volume of the rain = 0.66 cm * 800 cm * 600 cm = 316800 cm^3


and divide it by the area of the barrel base/(bottom)

   area of the barrel base/(bottom) = {{{pi*(d/2)^2}}} = {{{3.14159265*(60/2)^2}}} = 2827.433 cm^2.


You will get the water level rise of  {{{316800/2827.433}}} = 112 cm  (rounded).


Remember, that in such calculations, you should use the dimensions in consistent units.
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Solved.