On 25/01/2014 12:47, Vidcapper wrote:
On 25/01/2014 11:06, Norman wrote:
Vidcapper wrote:

Would the mounting poll being slightly off-vertical (presumably
knocked that
way by the recent strong winds) adversely affect recorded totals?

Presumably the buckets would each tip with different amounts of
water, but
wouldn't they offset each other?


I don't know how much difference it might make. In general, though,
the Davis
VP raingauges seem to under-read compared to a standard 5-inch manual
gauge.
Mine under-reads by 15-20%.

Mine started off under-reading by 10-15%, but recently that has risen to
about 30%.

I removed the funnel, and it didn't seem to be clogged up, and there
were no spiders lurking inside, so I'm not sure what's going on?

Following up, since I've re-aligned it back to vertical (or as close as
I can get it), the % under-reading compared to my standard copper rain
gauge for Feb to-date, is down to just 12%. In fact yesterday it
actually recorded *more* than the copper one!

--

Paul Hyett, Cheltenham