modify bucket to 0.1mm

Just my personal opinion but I think that’s an unreasonable decrease in tip size. I wouldn’t be trying to push that amount of water through that coffee mug sized OS rain gauge.

Sorry Breitling it was the tip size i was on about, its cause its in the rain offsets is why
i kept calling it the offset :oops:

The internal Diameter is now exactly 31cm thanks Breitling…
i cut the darn thing down too much, so much for the 0.1mm, it cant be too far off though :slight_smile:

I just want to give it a try Niko, see how it goes, if its too much then i will just remove it

It looks a bit ott i mist admit cause each stage i have made it bigger i just kept the older
one attached so it had the area for the new one to fit into, to its a 3 stage tower now lol

I also had to use a biggish flower container, finding a funnel was proving difficult for the size
wanted, so i went for something much bigger and cut it down…I aint attached it to the bucket
yet so no pics at present sorry, to be honest i dont really want to show it off either :oops:

hi Simon

0.1 is going to give you quite a few problems , as soon as you get moderate rain it will overwhelm the sensor

and give you incorrect rain readings

the lowest I have managed to get 0.25 tipping so far this is give me good results I would have fought there was a standard for the minimum tipping of most rain gauges Davies 0.2

I will be interested to see how you go on with this please send me some data back when you have some heavy rain
I would also put out a traditional manual rain gauge so you can compare results

mick :slight_smile:

Its up and waiting for the rain now lol

If it does cause any issues then i will just remove it again, its was stuck down with
hot glue so thinners will easily dissolve the glue, dont care about the addons if they
melt a little i can just sand them down :slight_smile:

I will certainly let you know how it goes, theres a manual weather station in Lidl later this week
could be now actually, i cant remember and i will get that to compare with :slight_smile:

I thought davis was 0.1mm? oh well lol but i did read on here somewhere that someone did modify
to 0.1mm and it was running ok, just cant remember where i read it now…

I dont think its gonna be quite 0.1mm anyway as i cut it down too much #-o

Just need to tip size and im good to go :slight_smile:

Good stuff Bashy, let us know how you get on (maybe a test pour with a jug?)

You really are the king of diy!

Thanks lol, you aint seen the image yet, attached below :oops:
A test pour never works out, i always end up doing too fast
But i will report the findings thats for sure…

Please dont laff, at least the top looks pretty :lol:

Looking at it i can see it getting blown off either Friday or Sunday :? :roll:


DSC00009.JPG

www.realweatherstation.com/rgcalc :lol:

Maybe better math, but certainly not better php :oops:

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:

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:

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

Oh, do you want this calculation?

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

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.

Actually all those calculators are wrong, back to the drawing board :oops:

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?

Oh dear Niko pmsl… not to worry…

Hi skyewright, thanks for joining in :slight_smile:

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

skyewright that’s exactly right :smiley: The calculators agree now too, sorry about that, never did a php calculator before :lol:

Couldn’t resist. :smiley:

Are you sure? I thought the inside diameter of an unmodified WMR928 rain gauge was 100mm.

Are you using something else?

I was going by what the book says, so that must be the outside diameter then?