"Will" wrote in message
...

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This posting expresses the personal view and opinions of the author.
Something which everyone on this planet should be able to do.
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As a postscript to my previous post.

I recorded 18.7 mm manually and 18.0 mm on my Davis VP.
Both instruments are set up OK (ie level, away from obstructions etc).
The quoted accuracy on my Davis for rainfall is +/- 4% .
4% of 18.0 mm is 0.72 mm, so it is operating perfectly accurately within
the
manufacturers specs. Also what is my error in my measuring rainfall with a
tapered measuring cyclinder ? (I like to think I'm careful but it is so
easy to
make mistakes).

I must say, I am extremely pleased with the performance of the VP so far
(all of
one day :-) ) and as with all scientific instruments one must be fully
aware of
their limitations.

Will.
--

If the rain has been heavy as you state then the tipping bucket design will
tend to under record - there were some readings at the time of the Boscastle
deluge that showed this could be substantial in size. I think the results
you have confirm that your guage is set up accurately as you say which makes
me think that any under recording at my site is due to the exposure. Living
in a garden surrounded by trees in other gardens makes it vitrually
impossible to get an ideal location for the station.

Alan