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 Rain Gauge accuracy experiment 
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 Post subject: Rain Gauge accuracy experiment
PostPosted: Sat Nov 12, 2016 4:27 pm 
Weather Nut
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Joined: Sat Apr 02, 2011 10:22 pm
Posts: 1935
Location: Isel valley, Northern Lakes
Altitude: 140m
Weather Station: Manual
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i have a manual 5 inch copper gauge vs a fully calibratable electronic 0.1mm tipping bucket gauge vs a 4 inch plastic climeMet manual gauge. All 3 are next to each other and all at 1ft above the ground

started on the 1st november and will do it to the end of the month.

so far.

Copper 5" 35.1mm

Tipping 34.9mm

ClimeMet 33.5mm


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 Post subject: Re: Rain Gauge accuracy experiment
PostPosted: Fri Dec 02, 2016 7:11 pm 
Weather Nut
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Joined: Sat Apr 02, 2011 10:22 pm
Posts: 1935
Location: Isel valley, Northern Lakes
Altitude: 140m
Weather Station: Manual
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Final Results for November 2016

Copper 5" 119.4mm

Tipping 120.4mm

Climemet 112.5mm


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 Post subject: Re: Rain Gauge accuracy experiment
PostPosted: Mon Dec 05, 2016 8:27 pm 
Professor
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Joined: Mon Nov 02, 2009 8:52 pm
Posts: 7478
Location: Brampton
Altitude: 117m
Weather Station: Davis VP2
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Are you assuming Copper is correct ?

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Paul C
Brampton. 117m ASL.
http://www.bramptonweather.co.uk
Imagehttps://twitter.com/#!/pacrabtree


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 Post subject: Re: Rain Gauge accuracy experiment
PostPosted: Tue Dec 06, 2016 12:14 am 
Weather Nut
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Joined: Sat Apr 02, 2011 10:22 pm
Posts: 1935
Location: Isel valley, Northern Lakes
Altitude: 140m
Weather Station: Manual
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Paul C wrote:
Are you assuming Copper is correct ?


interesting question.

is there such a thing as a correct figure?

Very little between the tipping and copper, and the plastic climemet was obviously a tad behind

as the copper 5" is the standard, figure id have to use that in comparison i guess


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 Post subject: Re: Rain Gauge accuracy experiment
PostPosted: Tue Dec 06, 2016 8:45 pm 
Professor
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Joined: Mon Nov 02, 2009 8:52 pm
Posts: 7478
Location: Brampton
Altitude: 117m
Weather Station: Davis VP2
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OK - I think thats the best way

Converted to a percentage

Tipping Bucket 100.8 % ( I would have thought acceptable)
Climemet 94.2% ( well below error margin )

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Paul C
Brampton. 117m ASL.
http://www.bramptonweather.co.uk
Imagehttps://twitter.com/#!/pacrabtree


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 Post subject: Re: Rain Gauge accuracy experiment
PostPosted: Tue Dec 06, 2016 10:04 pm 
Weather Nut
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Joined: Sat Apr 02, 2011 10:22 pm
Posts: 1935
Location: Isel valley, Northern Lakes
Altitude: 140m
Weather Station: Manual
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how does your vp2 compare to your 5" manual?


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 Post subject: Re: Rain Gauge accuracy experiment
PostPosted: Tue Dec 06, 2016 10:25 pm 
Chief Area Forecaster
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Joined: Sat Nov 14, 2009 10:57 am
Posts: 3126
Location: Seaton
Altitude: 40
Weather Station: Davis VP2
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Non will be correct. Rainfall/ppt is incredibly difficult to measure accurately, if you are getting within 10% agreement I wouldn't worry. I've read in exposed sites, 30% errors could occur due to wind eddies (on windy sites gauges should be in pits with top of gauge at ground level).

If rain fell with no wind and came down vertically and didn't evaporate, or fall as snow you may be able measure it accurately!


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