This is essentially a circular funnel with a diameter of 203mm which collects the rain into a graduated and calibrated cylinder. The measuring cylinder can record up to 25mm of precipitation. Any excess precipitation is captured in the outer metal cylinder. The top of the rain gauge is 0.3m above the ground.
What does a rain gauge measure and how does it work?
A rain gauge is really just a cylinder that catches rain. If an inch collects in the cylinder, it means an inch of rain has fallen. It’s that simple. Most standard rain gauges have a wide funnel leading into the cylinder and are calibrated so that one-tenth of an inch of rain measures one inch when it collects inside.
How does a rain gauge measure rainfall?
A rain gauge basically collects water falling on it and records the change over time in the rainfall depth, which is usually expressed in mm. You can get much more detailed information with disdrometers.
What does a rain gauge actually measure?
A rain gauge (also known as an udometer, pluviometer, ombrometer, and hyetometer) is an instrument used by meteorologists and hydrologists to gather and measure the amount of liquid precipitation over an area in a predefined area, period of time.
How are rain gauges accurate?
If your tipping bucket rain gauge is collecting less than 90% of what your manual gauge is collecting, there is likely a clog in the tipping bucket collector. … Manual rain gauges– Plastic rain gauges that have a 4 inch diameter opening at the top to catch rain are quite accurate.
Does the size of a rain gauge matter?
What is the size of a rain gauge? It doesn’t matter because it is not the volume but the height of the water we measure. For example, on a yearly average, all oceans, lakes, outdoor swimming pools and rain gauges increase by nearly one meter!
Where should I put my rain gauge?
Location! Keep your rain gauge in open areas as far away from obstacles as possible, whether trees, houses, or fences. Having your gauge level is another great way to keep the readings accurate. This will help rain from splashing out and to help with winds blowing.
Is code for rain gauge?
6.5 Raingauge of appropriate capacity as specified in IS 5225 shall be used to ensure the measurement of extremes of rainfall in the event of the observer being unable to take observations repeatedly on the day of such heavy rainfall.
How is rain gauge calculated?
Here’s what you’ll need to do:
- Measure the diameter of the bucket at the level of the rain. …
- Measure the diameter of the bucket at the bottom in the same way.
- Calculate the average of the two diameters.
- Divide by two to find the average radius.
- Find the average volume of rain = Depth x radius x radius x 3.14.
Why is rain gauge important?
A rain gauge is an important tool to help monitor global weather patterns, aid farmers dealing with drought and help meteorologists prepare for natural disasters.
How do you calibrate a rain gauge?
Use a ruler to mark measuring increments starting about 2″ from the bottom. 2. Place several small rocks in the bottom (for weight), then fill the bottle with water to the 0 mark. This will calibrate your gauge.
Who made the first rain gauge?
The first standardized rain gauge was invented in 1441 in Korea. In 1662 the first tipping bucket rain gauge was invented in Britain by Christopher Wren and Robert Hooke. The first systematic rainfall measurements were done between 1677 and 1694 by Richard Townley in Britain.