On Jan 2, 1:37*am, "jbm" wrote:

Litres per meter cubed = millimetres.

Just a nitpick, but it's litres per metre squared.

1 litre = 1000 cm^3, and 1 square metre = 10000 cm^2, so 1 litre/m^2 =
0.1 cm

(And, as an aside, a litre of water weighs 1 kg, so the record
Cumbrian rainfall back in November saw a metric ton of water fall in
24 hours on an area of a just over 3 square metres... or a square a
little under 6 feet on each side!)