✔ 最佳答案
One millimetre ( 1 mm) of rainfall corresponds to a volume of 1 Litre/m^2.
You may refer to the discussion on the following web-page:
http://www2b.abc.net.au/science/k2/stn/newposts/3562/topic2966725.shtm
Since 1 hour = 60 minunte, thus 1 mm/h corresponds to a rainfall volume rate of 1/60 Litre/m^2-minute = 0.0167 Litre/m^2-minute = 16.7 mL/m^2-minute.