CoCoRaHS Tutorial - How the rain gauge works
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- เผยแพร่เมื่อ 12 ก.ย. 2012
- This short video explains how the CoCoRaHS rain gauge works. By watching this video you will learn how to read rainfall measurements to the nearest 1/100th of an inch, and also how to accurately measure rainfall that is more than 1 inch. Participating with "CoCoRaHS for Schools" allows students to use a real scientific instrument and contribute real data that scientists and TV meteorologists use every day!
"More than 11 inches of rain, you have more things to worry about, like building a boat" *looks across Gulf Coast, from Texas to Florida* *Thumbs up*
Or in Far north Queensland during the monsoon season.
@@jmdds Or Martinstown, Dorset on 18 July 1955. 279 mm fell that day.
really informative ...! loved it!!!
Loved the video, answered all of my questions about it. Thanks.
totally
informative
Great introductory tutorial. I've been participating for more than a decade. But, their standard observation time of 7AM flew right into my sensibilities. Weather records run from midnight to midnight. Full stop.
So, I report mine appropriately and against the CoCoRaHS grain.
Your method makes more sense to me too. Has CoCoRaHS had anything to say about your reporting time?
@@sneakybulldog Yes. They even offered to change the default time on my record input screen to 2359, and said there are other people who go midnight to midnight. While they have no objection, it's pretty clear they aren't going to budge on this matter.
I seem to recall the person I communicated with thought that statistically it was less likely to be raining at 0700 than at midnight. That's certainly sounds fuzzy to me, and is not in line with my observations. Anyway, who cares if it's raining at observation time? It's so seldom, I don't mind getting a few drops on me, I don't melt when I get wet.
@@Vector_Ze Thanks for the response. Yeah - their documentation even says something about a lower chance of rain/snow at 7AM compared to other times of the day. I'd never heard that before. It is nice to know they're willing to adjust based on individual preferences though. Thanks again.
Thx for helping me ☺️ it help me very much
I bought this on amazon. Measures in 1/100 of an inch to total one inch. Works fine. Expensive for 3 pieces of plastic, but still, it’s fun. Seems sturdy but I’m bringing it in for the winter soon.
Its only useful for plane surface space as thought by 'logical europeans' not in mountains or tropical region. Because in mountain we measure the rain out of the type of rain, its intensity and its nature of pouring on the ground. That means there are many other experiential measuring scales people have in indigenous living and culture.
the larger outside container should also be calibrated. that way if you get say 4" of rain, you can easily add the 2 tubes together for a general measurement. not a scientific measurement. I use a 7" tall glass cylinder, from the dollar store, its common usage may be to hold flowers, not sure, but it's perfect for a durable rain gauge. I've attached a laminated paper ruler to the outside of it. works great, been using it for 5 years
Thanks a lot sira
Sir, I have come across different techniques of making rain gauge at home or as a part of activity at schools. How can I calibrate the self-made gauge with standard norms as bottles and containers vary with everyone ?
any diameter will do as long it is a cylindrical with a flat bottom.
Thanks
thnx
Is there standard size of inner tube container?
Thanku teacher ❤
Simple . ✌🏼🔥
0.31" x 16 = 4.96, so it's 1" & 4.96/16th of rain. Or.. 0.31" x 32 = 9.92, 1" & 9.92/32nd" or rain. or.. 0.31" x 25.4mm = 7.874mm
I thought that if I put a container with straight sides that it would be able to measure the rainfall. But the rain gauges made by companies is just a little more dramatic. I think that's the word.. Not sure, correct me if dramatic or dynamic isn't a good word.
Will the suns UV burn off the markings within a year like everything I buy here in TX??
Please correct me if Im wrong, the purpose of the measuring can is to collect rainfall (especially trace amounts) and know the depth of it given the dimensions of the cylinder. Now if I want to use the depth of rainfall collected in that cylinder and correlate it to a specific area, say 1 hectare, then I just have to do ratio and proportion using the (depth/area of cylinder's mouth) times (x/area of 1 hectare) and just solve for x? hmmmm
One millimetre of rain is equal to one square meter at 1mm high.
We might build some great boats in the Great Sahara where it rains intensively once in 20-40 years with 2250 mm/day, to struggle against sudden inudations. lol
that never happen.
No mention of "the wind problem" or how rain gauges do not accurately measure rainfall because of where it could be placed. Imagine a student places the rain gauge in their backyard as the presenter suggests: the surrounding structures or possible vegetation can obstruct the true rainfall amounts and skew the data. If the rain gauge was placed on the side of a building, wind can move up the side of the structure and push rain away from the gauge resulting in more rainfall on the side where the gauge isn't, or the other way around: both resulting in inaccurate data. It is easy when demonstrated with a pitcher of water. But if you demonstrate by using a spray nozzle on a hose in an open yard and place the rain gauge in the path of the falling water while moving the hose from side to side it will appear that the rain gauge collects water uniformly when in fact rain falls anything but uniform. If the pitcher was placed in the center of the pivoting spray hose area, then it would collect more water than if it were placed and the edge of the spray hose area. If you know for certain I am wrong, please correct me. As a reasonable scientist, I am willing to be proven wrong when presented with empirical data.
dig a hole and put it in the ground
+Jason Ortiz good points
Jason Ortiz what
You just explained one thing with a whole paragraph...
would an open field be the best place for a rain gauge?
it is said any diameter container will do, but if i put he "calibrated" inner tube directly out in the field next to the outer container, and an inch of rain falls the height of rain in the 2 containers is different, you say put a ruler in the outer and measure an inch on the ruler, but the pour it into the calibrated tube to "accurately" measure it, but if that calibrated in tube was not calibrated and an ordinary tube putting the ruler against that tube would measure a different height as you show 1 inch fills that tube but 1 inch in the outer is not very high, so surley putting a ruler in any diameter container will record a differnt heigh on the ruler..I am confused...
same question. I don't understand why the height of the water changes when it is poured into different container that is calibrated.
Intro song?
what about the time you never tell how long do we need to set the gauge outside for a particular season rain or a daily weather
What if the the top furnace diameter is bigger
The amount of water would be recorded in large amount
My question is if there are two different rain gauge with different dimensions
How are we supposed to calculate the amount of rain fall?
Well, then you need a bigger measuring tube which can hold 1 inch depth of water of your furnace. Ultimately result will be the same. The measuring tube is proportional to the furnace size.
What's the song at start
Amazing to hear so many people talk about inches of rain with out telling how much VOLUME there is in "one inch" of rain. I found that one inch of rain is 4.7 gallons of water (in a one squared foot one inch high) or one liter of water ( in one squared meter 1mm high). Is this true??? Any one???
Exactly. One millimetre of rain is equal to one square meter at 1mm high.
People interested in rainfall for gardens or farming generally want the depth of the rainfall. An inch of rain in a back yard patch of corn means essentially the same as a one inch rainfall in an industrial farm covering hundreds of acres.
People concerned about saving water in reservoirs or handling storm runoff are more interested in volume, and in the US that often means "acre-feet." That's not acres minus feet, but the volume of water that fell on the watershed (in acres) multiplied by rainfall in feet. This often isn't for a one-day event, but something like the springtime runoff of the entire snow season's precipitation.
A cubic foot of water is 7.48 gallons, therefore your 12" x 12" x 1" volume is only 0.623 gallons.
i probably need a boat now
Where i can buy this in Canada?
There is a store on the CoCoRaHS website. Canada is part of the CoCoRaHS network.
how to calibrate the rain gauge collector and measuring tube??
any diameter will do as long it is is a cylindrical .
Can someone explain, why is the height of the water level changes when it is poured into different container that is calibrated. I am confused because I thought the water level will be the same regardless of the diameter and shape of the containers as long as the sides are straight and the top and bottom are of the same size.
Lol this caught me off guard at first. I was thinking surely you realize the volumes of the containers are different. But then I realized what you were asking I think.
The “inch” measurement is different because the water was captured using a larger diameter container, then transferred to the smaller measuring tube.
If you sat both the larger container and the smaller container out in the same rain they should both measure the same “depth” of water because of how big the opening is in the container.
(Edit: the smaller tubes graduations would be incorrect if you did this. But if you sat the two containers side by side the water level should essentially be the exact same)
what if the rain is continuous and both the inner and the outer cylinder are full? How are we gonna measure the rain then?
We have to choose a outer cyclinder of appropriate size\
is this measurement for 1 day or 1 hour or entire duration of rain?
You always take the measurement at 0900 hours (1000 hours if you’re on Daylight Saving Time) and enter the reading against the previous day.
how many ml is 1inch rain? lets say we use the same measuring system?
just curious
Millilitres, I’m not sure. Depends on the cylinder you use. 1" is exactly 25.4 mm.
.
What is the diameter of the cilynder in mm or cm ? I want to make " homemade" one.
any diameter will do as long it is is a cylindrical .
standard diameter should be 5 inches
@@sreeharshasmg Most places use 8inch- 203mm diameter.
Why dont they also mark the outer cylinder to give a overall reading? lf it is raining over several days, it would be nice to see how much has accumulated without having to empty it
Water evaporate causes an incorrect reading.
Real science does not use imperial measurement system...
You are exactly right then are still in the stone ages with imperial.
Since I’m not a real scientist, I like inches.
Just do conversions, no big deal buddy.
I don't know why no one talks about the time period for which we need to measure it. What is the actual time for which it should be collecting water? If I leave it overnight, may be hundreds of such tubes would be filled.
Can someone please clear my doubt?
It really depends on how long want to do it and maybe u can do it on a hour by hour basis or just use a really large container
You don't mention how to measure hail as it generally bounces out of the rain Guage or even breaks it
why dont you use the metric system once and for all ?
Well exhibited
U don't give us the exact diameter of the big tube and all the video is unusual
This is really ggod
This is a really great video, but the presenter needs to put the plastic container on a flat surface to measure the water correctly. If he picks up the container, the water moves around and the measurement is not correct. Again, this was a great video, but it would be better if the container were always left on a flat surface and not picked up. Have a great day!
It is just for knowing...
I feel like i understand this, but ... you know...!
It is 7 years old 😱
Hat gamers are real legends jo sahamat ha vo subscribe kra harsh gaming ko
Lol switch to metric system already, far simpler.
True but completely irrelevant to this video as he only talked about 10ths, 100ths, and whole numbers. Ya know, similar to metric simplicity.
@@jerredlee6739 The only thing similar to metric is that it is a measurement.
Using 10ths n 100ths is still fractions, not whole numbers.
I'm guess you grew up learning the imperial system.
Stupid.
So I'm ok to collect rain in a container the size of my back yard? And over a year?
no because of evaporation.The most accurate would be ever 24 hours
that was not a good guess
my bad, lmao, it turned out to be a good guess
You Americans would make your lives a whole lot easier if you used millimetres like the rest of the World!
Boring