Hi,
No, mm is correct (it should be the same for any area), but you can consider 1 mm as one litre per square metre if you wish.
However, a typical rain gauge (or an automatic "tipping bucket" type) generally "magnifies" the value by collecting the rain over a larger area than is used to measure the depth. For example it may have a "funnel" with an area of 100 sq cms but a collection tube (or bucket) only a cm or two across. Thus the "depth" of collected water needs to be multiplied by the ratio of the areas.
@Werk_AG: Thanks for that info on the CH340. I often use them, but wasn't aware of the potential issue with multiple devices.
Cheers, Alan.
(21-04-2015, 00:20)moolight0551 Wrote: Our rain in Australia is just reported as mm but I guess this really means mm/square metres.
No, mm is correct (it should be the same for any area), but you can consider 1 mm as one litre per square metre if you wish.
However, a typical rain gauge (or an automatic "tipping bucket" type) generally "magnifies" the value by collecting the rain over a larger area than is used to measure the depth. For example it may have a "funnel" with an area of 100 sq cms but a collection tube (or bucket) only a cm or two across. Thus the "depth" of collected water needs to be multiplied by the ratio of the areas.
@Werk_AG: Thanks for that info on the CH340. I often use them, but wasn't aware of the potential issue with multiple devices.
Cheers, Alan.