Hi,
I have just added a bigger funnel to my W-8681 rain gauge, and now I need to know what the multiplier should be.
My funnel has a diameter of 18cm, so I have worked out the area is 283cm squared. How would I go about working out the new multiplier?
Thanks,
Mark
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Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4017) - 17 March 2024
Legacy Cumulus 1 release v1.9.4 (build 1099) - 28 November 2014 (a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Rain Gauge Funnel Multiplier
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- Posts: 17
- Joined: Thu 28 Jan 2010 7:53 pm
- Weather Station: W-8681 (WH-1080)
- Operating System: Windows 7
- Location: Carnkie, Helston, Cornwall
- Contact:
Rain Gauge Funnel Multiplier
Carnkie Weather Station & Webcam: http://carnkieweather.co.uk
Live from Carnkie, Nr Helston, Cornwall.
Live from Carnkie, Nr Helston, Cornwall.
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- Posts: 1885
- Joined: Sat 21 Feb 2009 12:41 pm
- Weather Station: Nothing working ATM - making one
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Re: Rain Gauge Funnel Multiplier
The area of the original rain gauge is 55 sq. cm. so the correction is 55 divided by your new funnel area.
Diameter = 18cm Radius = 9cm r2 = 81 - multiply this by Pi (3.142) gives 254.5 sq. cm. So the ratio is 4.627 (254.5/55) and the correction factor (multiplier) is the inverse of this = 0.216. Actually 55/254.5 ie. old/new catchment area.
Diameter = 18cm Radius = 9cm r2 = 81 - multiply this by Pi (3.142) gives 254.5 sq. cm. So the ratio is 4.627 (254.5/55) and the correction factor (multiplier) is the inverse of this = 0.216. Actually 55/254.5 ie. old/new catchment area.
Gina
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- Posts: 17
- Joined: Thu 28 Jan 2010 7:53 pm
- Weather Station: W-8681 (WH-1080)
- Operating System: Windows 7
- Location: Carnkie, Helston, Cornwall
- Contact:
Re: Rain Gauge Funnel Multiplier
Thanks alot for that Gina. I never would have worked that out.
Carnkie Weather Station & Webcam: http://carnkieweather.co.uk
Live from Carnkie, Nr Helston, Cornwall.
Live from Carnkie, Nr Helston, Cornwall.
-
- Posts: 1885
- Joined: Sat 21 Feb 2009 12:41 pm
- Weather Station: Nothing working ATM - making one
- Operating System: OS X, Linux Mint, Win7 & XP
- Location: Devon UK
Re: Rain Gauge Funnel Multiplier
Maths was one of my best subjects at schoolMark19 wrote:Thanks alot for that Gina. I never would have worked that out.
Gina
Sorry, no banner - weather station out of action. Hoping to be up and running with a new home-made one soon.
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