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
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
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
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
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
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:
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:
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
To answer your question “Does that make sense?” not really cause my original is 113.5 :?
skyewright that’s exactly right The calculators agree now too, sorry about that, never did a php calculator before :lol:
Couldn’t resist.
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?