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Author Topic: modify bucket to 0.1mm  (Read 84078 times)

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Re: modify bucket to 0.1mm
« Reply #15 on: February 27, 2008, 05:09:08 PM »
That calulator's no good for thoughs of us with La Crosse raingauges, they're square!!  :lol:

Offline niko

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Re: modify bucket to 0.1mm
« Reply #16 on: February 27, 2008, 05:12:34 PM »
That calulator's no good for thoughs of us with La Crosse raingauges, they're square!!  :lol:

Oh, I haven't seen that model, they used to be rectangular  :lol:

Bashy

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Re: modify bucket to 0.1mm
« Reply #17 on: February 27, 2008, 05:16:36 PM »
HI Niko, thanks for the link but witt me being as thick as i am
i aint got a clue what goes in the old tip and new tip  :oops:

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Re: modify bucket to 0.1mm
« Reply #18 on: February 27, 2008, 05:18:07 PM »
Oh, I haven't seen that model, they used to be rectangular  :lol:

It's the weather here, it alters their shape.  :oops:

Offline niko

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Re: modify bucket to 0.1mm
« Reply #19 on: February 27, 2008, 05:34:27 PM »
HI Niko, thanks for the link but witt me being as thick as i am
i aint got a clue what goes in the old tip and new tip  :oops:

Oh, do you want this calculation?

Bashy

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Re: modify bucket to 0.1mm
« Reply #20 on: February 27, 2008, 05:38:20 PM »
Thats better for me thanks Niko, but i still need to find what the original tip size is, is it 1.0mm?

Actually i went from my last modification

old mod 200mm  new mod 310 new tip 0.16129032258065 does this sound about right?

I thought it would have been closer to the 0.1mm than that though.
cause the 200mm was @ 0.25
« Last Edit: February 27, 2008, 05:42:00 PM by Bashy »

Offline Breitling

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Re: modify bucket to 0.1mm
« Reply #21 on: February 27, 2008, 06:01:32 PM »
old mod 200mm  new mod 310 new tip 0.16129032258065 does this sound about right?

You need a known start point. And that is the original Oregon resolution. A tip based on a 10 cm diameter area (78.53 cm2) is 1 mm. Use these data as your "old" data with the second Niko's calculator. The first one is not valid.

Offline niko

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Re: modify bucket to 0.1mm
« Reply #22 on: February 27, 2008, 06:02:36 PM »
Actually all those calculators are wrong, back to the drawing board  :oops:

Offline David W

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Re: modify bucket to 0.1mm
« Reply #23 on: February 27, 2008, 06:08:31 PM »
old mod 200mm  new mod 310 new tip 0.16129032258065 does this sound about right?

I thought it would have been closer to the 0.1mm than that though.
cause the 200mm was @ 0.25
At the risk of causing more confusion...

In going from a 100mm diameter to a 200mm diameter you doubled the diameter.
If you multiply the diameter by 2 you change the collecting area by 2 x 2 = 4. So with 4 times the area each tip will be caused by 1/4 = 0.25 as much rain as with no modification.

If you increase the original 100mm to 310mm, you have increased the collecting area by 3.1 x 3.1 = 9.61. With 9.61 times the area each tip will be caused by 1/9.61 = 0.104 as much rain as with no modification.

Does that make sense?
Regards
David

Bashy

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Re: modify bucket to 0.1mm
« Reply #24 on: February 27, 2008, 06:24:54 PM »
Oh dear Niko pmsl... not to worry...

Hi skyewright, thanks for joining in :)

To answer your question "Does that make sense?" not really cause my original is 113.5  :?

Offline niko

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Re: modify bucket to 0.1mm
« Reply #25 on: February 27, 2008, 06:25:55 PM »
skyewright that's exactly right  :D  The calculators agree now too, sorry about that, never did a php calculator before  :lol:

Offline David W

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Re: modify bucket to 0.1mm
« Reply #26 on: February 27, 2008, 06:42:56 PM »
Hi skyewright, thanks for joining in :)
Couldn't resist. :D

To answer your question "Does that make sense?" not really cause my original is 113.5  :?
Are you sure? I thought the inside diameter of an unmodified WMR928 rain gauge was 100mm.

Are you using something else?
Regards
David

Bashy

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Re: modify bucket to 0.1mm
« Reply #27 on: February 27, 2008, 06:44:21 PM »
I was going by what the book says, so that must be the outside diameter then?

Offline David W

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Re: modify bucket to 0.1mm
« Reply #28 on: February 27, 2008, 06:54:15 PM »
I was going by what the book says, so that must be the outside diameter then?
That's what that figure it sounds like to me.
Maybe you could do a rough check by holding a ruler against your gauge?
Not precise, but it should at least indicate which figure is more likely.
Regards
David

Bashy

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Re: modify bucket to 0.1mm
« Reply #29 on: February 27, 2008, 06:59:25 PM »
That's what that figure it sounds like to me.
Maybe you could do a rough check by holding a ruler against your gauge?
Not precise, but it should at least indicate which figure is more likely.

Not possible to measure it anymore the modifications prevent that :(

I will go by your measurement of 0.104 that certainly sounds about right to me

Thanks for your help, you to Niko and you three Breitling, appreciated guys :)

 

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