Rain Gauges and how to make one.

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Postby Tim S » Tue Aug 22, 2006 8:49 pm

MikeF wrote:In mathematics, an "oval" is more correctly called an ellipse, and the
area of an ellipse is given by Pi*a*b, where 2*a is the length of the
longer side (measured at its greatest width) and 2*b is the length of
the shortest side (measured at its greatest height). (Doctor Paul)
Reference Address


Cheers Chop! :)

I was wondering to see if it would make much of a difference having a slightly squashed funnel on top of gauge to increase its measuring ability and the answer not really, unless it was really squashed. :)
Kia Kaha, stay strong, live long and above all have fun. :)

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Postby Beef_Taco » Tue Aug 22, 2006 8:55 pm

Where do you have yours? The roof is a bit of a pain in the arse. A wall may be a good option for me, but i can't think of any off the top of my head. I guess all it has to do is be accessable from the west, as that's where the fronts come from?

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Postby Tim S » Tue Aug 22, 2006 9:10 pm

Ive got two, ones on a short pole in the garden and the others attached to the roof. You dont only want good coverage from the west because rain comes from a lot of directions specially in suburbia where there are a lot of objects which cause the wind to swirl and eddy. Maybe on top of the washing line?
Kia Kaha, stay strong, live long and above all have fun. :)

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Postby Beef_Taco » Wed Aug 23, 2006 6:17 am

Could be an idea, i have a flat tree stump in my yard aswell. Have to suss something out.

Edit: Won't it blow off the line?

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Postby squid » Wed Aug 23, 2006 8:19 am

how much does the 250mm rain gauge cost??

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Postby mikeh » Sat Nov 11, 2006 9:09 pm

I discovered this discussion and I would like to congradulate Mike F on his formula knowledge but no surprise considering his background.

A circle is a special case of an ellipse where a=b.

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Postby MikeF » Sun Nov 12, 2006 4:41 pm

Thanks MikeH

The internet is a wonderful place where you can find out someone elses interpretation of it and then apply it to this forum

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Rain Gauges and how to make one.

Postby Lert » Thu Apr 17, 2008 3:16 pm

G'day all,

Many of us report our rainfall but if you dont have a 'bought' rain gauge that should be no impediment to letting us know what fell in your backyard..

Ok, the thread title is a bit misleading. You don't have to make anything at all :!:

First principle: 1mm of rain = 1 litre per square metre..

Just take your average RGB (red, green or blue) Woolys 9 litre bucket.

We need to calculate the area of the top of the bucket in square meters..
My buckets diameter is 260mm.. Area = Pi * radius squared = 53093 square mm.. A square metre = 1000000mm.. Divide 1000000 by 53093 and you come up with 18.8 ..

All you have to do is empty the bucket in to a graduated container to find how many litres(or part thereof) you have.. Multiply litres by 18.8 to get you mm.. easy aye, and costs nothing.. measure you own bucket and away you go..

Cheers
2006 - 543.5mm, 2007 - 701.5mm, 2008 - 833.5mm, 2009 - 579mm, 2010 - 631.5mm, 2011 - 872.5mm, 2012 - 770mm

2013 Jan 5mm YTD 5mm

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Re: Make your own rain gauge..

Postby SimonB » Thu Apr 17, 2008 4:26 pm

Lert wrote:My buckets diameter is 260mm.. Area = Pi * radius squared = 53093 square mm.. A square metre = 1000000mm.. Divide 1000000 by 53093 and you come up with 18.8 ..

Excellent post, Lert! However, I wonder how many young 'uns would know the value of PI (3.14159, from memory) and what 'PI * radius squared' means :lol: Maybe I am being unfair, but going by the shopping centre checkout dudes, I don't think so.

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Postby Lert » Thu Apr 17, 2008 5:11 pm

Oh.. and I thought it may have been too simplistic..

Ok, if you don't have a scientific calculator and you have windoze :

Start>all programs>accessories>calculator>view>scientific
* means multiply
Pi = the relationship of the circumference of a circle to the diameter.. 3.141592654 will do for the purpose of this exercise :) (3.14 will do)

I hope to see rainfall totals from all wawxers from now on..OK..
2006 - 543.5mm, 2007 - 701.5mm, 2008 - 833.5mm, 2009 - 579mm, 2010 - 631.5mm, 2011 - 872.5mm, 2012 - 770mm

2013 Jan 5mm YTD 5mm

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Rain Gauges

Postby Fu Manchu » Thu Jun 19, 2008 9:03 pm


BigStorm

Re: Jolly Jigs in Puddles During June 2011

Postby BigStorm » Sat Jun 18, 2011 9:13 am

Fu Manchu wrote:Vinny, ya gotta get a rain gauge! Cost you $20-30 for a practical one that holds 250mm.

You can get a gauge from most retic shops, agricultural shops, and hardware.

Everyone on this forum should have a rain guage. You can't call yourself a weather nut if you don't at least have a rain guage.
re todays front it doesn't look too promising but a few mm wouldn't so astray. Later next week it looks like we will go into a true winter pattern with a series of fronts (some strong) and the high pressure systems staying over the continent for a while. :D

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Jolly Jigs in Puddles During June 2011

Postby Fu Manchu » Sat Jun 18, 2011 9:24 am

Well you can be a weather nut with out a gauge but its good to have one. I understand so many of you don't have them. It's cool :)

Nylex do a good gauge.

BigStorm

Re: Jolly Jigs in Puddles During June 2011

Postby BigStorm » Sat Jun 18, 2011 9:29 am

National Geographic shop have a few as well.

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Re: Jolly Jigs in Puddles During June 2011

Postby ozzie » Sat Jun 18, 2011 9:53 am

Ebay is a good place for weather station/rain gauge :mrgreen:

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Re: Jolly Jigs in Puddles During June 2011

Postby Tasman » Sat Jun 18, 2011 10:02 am

BigStorm wrote: You can't call yourself a weather nut if you don't at least have a rain guage.


It can be quite pointless for many people these days on small properties where trees and buildings significantly affect any rainfall collection.

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Jolly Jigs in Puddles During June 2011

Postby Fu Manchu » Sat Jun 18, 2011 10:10 am

Yeah, that's pretty true Tasman.
I will be having to install the funnel on the roof, then have a pipe run down to the gauge. I'll need to get another rain gauge to do that. I think I might have another idea too..,

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Re: Jolly Jigs in Puddles During June 2011

Postby Lert » Sat Jun 18, 2011 10:19 am

Fu Manchu wrote:Vinny, ya gotta get a rain gauge! Cost you $20-30 for a practical one that holds 250mm.

You can get a gauge from most retic shops, agricultural shops, and hardware.



Its not necessary to 'buy' a rain gauge. Anything will do that looks like a bucket of some kind. All that is necessary is to calculate the area of the aperture in sq.mm and work out its fraction of a square meter. In my case the bucket is 1/34th of a square meter. All you need to do then is measure how many litres of rain fell in the bucket and multiply by 34 = mm of rain.

The hardest part is to remember to put a stone in the bucket so that it does not blow off the shed :)
2006 - 543.5mm, 2007 - 701.5mm, 2008 - 833.5mm, 2009 - 579mm, 2010 - 631.5mm, 2011 - 872.5mm, 2012 - 770mm

2013 Jan 5mm YTD 5mm

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Re: Jolly Jigs in Puddles During June 2011

Postby Tim S » Sat Jun 18, 2011 10:26 am

Tasman wrote:
BigStorm wrote: You can't call yourself a weather nut if you don't at least have a rain guage.


It can be quite pointless for many people these days on small properties where trees and buildings significantly affect any rainfall collection.


You can usually find a place to put a rain gauge that has a reasonably good sky coverage, the rule of thumb is were you place a rain gauge, you need clear sky at least in the direction of the prevailing wind down to 45 degrees above the horizon. Granted this isn't possible in every garden but usually you can get a fairly good spot on a shed roof or whatnot. Failing that you could put your gauge somewhere it actually rains like uNZud. :wink:
Kia Kaha, stay strong, live long and above all have fun. :)

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Re: Rain Gauges and how to make one.

Postby Fu Manchu » Sat Jun 18, 2011 10:40 am

Here is a handy link too on rain gauges
http://forums.whirlpool.net.au/archive/1391999

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