In article , MM
writes
I can't visualise the quantity. Is it a lot? It's 219 UK gallons, but
that is still a quantity I can't really get my head around. How much
would I use watering the garden? 20 minutes with a spray head on a
hose over approx 75 square meters, that is.

MM

A cubic meter spread over 75 square meters corresponds to a depth of
1/75th of a meter or 4/3 cm, which is about half an inch. Equal to one
torrential thunderstorm, or a day's solid rain.
--
Stewart Robert Hinsley