modify bucket to 0.1mm

[skyewright]

What's your high rain rate record in "All Time Records" Bashy?

Do you recall which gauge were you using at that time?

[Bashy]

Bear in mind that the rain that tipped my 0.25mm gauge 4 times in a minute would have tipped your 0.1mm gauge 10 times, that's  only 6 seconds between tips (approx. and assuming steady flow).

On the other hand however, with a 0.1mm gauge if you miss a tip you are (obviously) only missing 0.1mm - and if is raining that hard you are probably not too bothered about the odd 0.1mm here or there!  Laughing

Some good points there

Lets say we have a monsoon here in the UK...
If its 999mm per hour max, thats 16.65 tips in a minute (i think maths aint good lol)
if i now divide that by ten then by rights my bucket now should only be able to handle
1.665 tips per minute, is that right? prob not lol

But going back a little while now when we did have some heavy rain, what i noticed was
on the graph, it didnt go up by 0.1mm all the time, there was times when it actually jumped
to say 0.6m or 1.0mm, so i think as its tipping away its storing it in memory then passing it to
WD on the next cycle...

As for my max rain was only about 12.8mm on the 22nd of june this year, i did the mod on or
around the 27th of Feb this year

[Bashy]

Ah sorry you said rain rate, that was january at 228mm/hr that was BM
Before Mod lol

[skyewright]

Lets say we have a monsoon here in the UK...
If its 999mm per hour max, thats 16.65 tips in a minute (i think maths aint good lol)
if i now divide that by ten then by rights my bucket now should only be able to handle
1.665 tips per minute, is that right? prob not lol

You are nearly there - but change "tips" to "mm". 

If 999mm/h (standard) really is a physical limit, then 16.65 is the max tips that the mechanism can handle, and would be a fixed point of reference regardless of how much rain each tip actually represents.

If that is the case, with your 01.mm per tip instead of the standard 1.0mm per tip your max rate would be 99mm/h  (i.e. 10 times higher sensitivity, 10 times lower max rate).

Lets say we have a monsoon here in the UK...
But going back a little while now when we did have some heavy rain, what i noticed was
on the graph, it didnt go up by 0.1mm all the time, there was times when it actually jumped
to say 0.6m or 1.0mm, so i think as its tipping away its storing it in memory then passing it to
WD on the next cycle...

Yes.
If (with your current mod) there has been a 0.6mm step in WD, that was 6 tips - or 10 tips for a 1.0mm step.[/quote]

rain rate, that was january at 228mm/hr that was BM
Before Mod lol

But didn't you have a 0.25 mod before the 0.1mm?
With no mod that would be approx. 16 seconds between tips.
With a 0.25mm mode it would be approx. 4 seconds between tips
And with a 0.1mm mod it would be approx 1.6 seconds between tips.


Oddly my "All Time Records" give a mm/min figure. Maybe the unit is an option somewhere?
My record is 10.0mm/min (back on 23rd Feb this year), and with an unmodified gauge.

That rate is 6 seconds between tips with the unmodified gauge,
equivalent to 1.5 seconds between tips with 4 times (0.25mm) gauge,
or 0.6 seconds between tips with a 10 times (0.1mm) gauge!

I'd be really impressed if the OS gauge could handle 0.6 seconds between tips! 

[Bashy]

Ah yeah good point i did have the 0.25 mod installed, i forgot about that pmsl...

I'd be really impressed if the OS gauge could handle 0.6 seconds between tips!  Very Happy

you would be impressed, i think so would OS pmsl...

I cant rememebr where you change it to mm/ph....ah, yes i do, its in the All Time Records, top menu far right

[Bashy]

Just want to update on this one, there was talk about its performance in heavy rain, well
before the modification to 0.1mm was 228mm and its just broke that now at 374.4mm/hour

[Billw69]

Bashy, Thats impressive. We have had very little rain here since I modified mine. I probably won't see anything like that till early spring. So far though, it HAS recorded a couple of light sprinkles that it would have totally missed before it was modified.

[Bashy]

I m8 it aint bad, I was just thinking tonight (just before it happened) if it was perhaps
too big and missing tips (being overwhelmed as folks have pointed out, the reason i was
thinking this was because the recorded stuck from January till tonight, so i was getting
a tad worried, but its now put my mind at rest, well im chuffed with it for sure

[skyewright]

Just want to update on this one, there was talk about its performance in heavy rain, well
before the modification to 0.1mm was 228mm and its just broke that now at 374.4mm/hour

That's effectively ~3.7 x the 'max' rate for the unit (i.e. the console would think of it as 3744mm/hour). I quietly hoped that the 999 limit just really mean "it can only show 3 digits", maybe that's the case. 

One thing I have noticed here is that my 8" funnel / 0.25mm tip modified WMR928 gauge seems to suffer more 'wind loss' than the unmodified WMR200, i.e. on calmer or low wind days days they report very similar rain, but when it gets windy the 928 lags behind.

I'm thinking of trying out some 'wind calming' measures around the gauges...

[Bashy]

Thats strange, you would have thought the bigger the area then more chance to catch the rain
but then i suppose thats counteracted by the tip offset, i should shut now as i dont really
understand what im on about, im just guessing lol

Sadly the console done have a memory for the rain rate but it aint shown any --- tonight thats
for sure and i certainly dont remeber seeing anything in the 100's either, perhaps a little baffling lol

Its only at 31mm/hr at present, WD is at 7.80 mm/hour

Hold on, you sure you didnt get it the wrong way round?

[Bashy]

The strangest thing is its now dropped to 372.0mm/hour lol How is that possible?

[skyewright]

Hold on, you sure you didnt get it the wrong way round?

I assumed you meant 374.4mm/hr as recorded in WD, which the console would (if it could) see as 3744mm/hr (because the console thinks that every tip represents a mm, whereas WD has been told that it's only 0.1mm).

Or did you mean something else?

[skyewright]

The strangest thing is its now dropped to 372.0mm/hour lol How is that possible?

Strange.
Just to be sure - is this "Maximum rain rate" on the main WD screen we are talking about, or  "All time records", or both?

[Bashy]

Its just my maths is all, never been any good at it lol but this is what i worked it out at;

to get 374 in WD would be 374 x 0.104 = 38.896mm on the console but like i said my maths
are totally pants, when it comes to decimals "i am NOT smarter than a 10 year old" lol

But yes WD all time record said 374.4 mm/hour but now it only says 372.0 mm/hour, surely this
is an impossibility? how can the maximum all time be recorded as 372 when  an hour or so it was
374.4??

BOTH

[skyewright]

to get 374 in WD would be 374 x 0.104 = 38.896mm on the console

Other way around.

The console knows nothing about the funnel, so it still thinks that every tip is 1mm.

WD knows that each tip is really 0.104mm

So the console thinks there is (approx) 10 times more rain than there really is.

Does that make sense?

how can the maximum all time be recorded as 372 when  an hour or so it was
374.4??

No idea...