[wxqc] rain gauge question

[Milford Weather]

Personally I prefer to take it back a step and compare it to a known, in
this case a calculated value.  The following are my calculations based on a
Davis rain gage, but can be used for others as long as you use the correct
radius/diameter:

 

Calculations:     V=π r2 h (rain collector 6.5" diameter, 3.25" radius)

                        π r2 = 33.1831

V in3 / 33.1831 = inches rainfall

 

 

Known:             1 US cup = 14.4375 in3 

1 US qt = 57.75 in3

1 US Gal = 231.0 in3

 

Therefore.       1 cup = 0.4351" rainfall

1 qt = 1.7404" rainfall

1 Gal = 6.961' rainfall

 

A few important notes:

*         It is Important to "release" the water at a reasonable rate into
the gage (I use pin holes in the bottom of an old plastic container)

*         The larger the volume used reduces errors

*         Sample volume used must be accurate to begin with

 

Check the new daily timelapse sky videos:
http://www.pdfamily.com/weather/cams.htm 

 

Paul

 

CW3414

SkyWarn Spotter

http:/www.PDfamily.com/weather <http://www.pdfamily.com/weather/index.html> 



  _____  

From: wxqc-bounces at lists.gladstonefamily.net
[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of jim
Sent: Saturday, July 08, 2006 11:43 AM
To: wxqc at lists.gladstonefamily.net
Subject: [wxqc] rain gauge question

 

to any one 

 

I was issued a Tru-Chek Rain gauge by the storm spotter coordinator in my
area. My question is: is it accurate enough to calibrate my Electronic rain
gauge to.

My electronic rain gauge is a Peet Bros .01" pro rain gauge. or should I
invest in a different type for calibration purposes.

 

Jim

CW4367

  

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