# How Do You Measure Rainfall Accurately?

## How do they calculate rainfall?

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.More items….

## Can you measure rain in a bucket?

Rain and drizzle are the easiest forms of precipitation to measure. Rain gauges are used to measure liquid water depth and can be as simple as an open bucket with a consistent cross section throughout. Meteorologists however, use more accurate instruments and slightly more sophisticated gauges to measure rainfall.

## What does 10 cm rainfall mean?

When poured in a measuring glass cylinder with 10 Sq Cm base, the height will be amplified to 10 Cm but graduation will show as 1 cm; 1 cm will be 1 mm;and 0.1 cm will be 0.1 mm. So rainfall can be measured correct up to 0.1 mm.

## How do I calibrate my AcuRite rain gauge?

Place the display console close by so you can monitor it during the calibration process. Make a pinhole in the bottom of a plastic cup. Hold the cup over the rain gauge and fill it with exactly 1 cup (8 oz.) of water, allowing the water to drip into the rain gauge.

## How much is 1 inch of rain in ounces?

28 ouncesA standard Weather Service rain gauge is a cylinder eight inches in diameter, so one inch of rain would have a volume of about 28 ounces or about three cups.

## How do I know if my rain gauge is accurate?

Tip: To have accurate results, ensure that all the water in the container is poured into the rain gauge before the test is complete. As the water flows into the rain gauge, the percentage error decreases until the measured value is the same as the expected rainfall. At that point, the error percentage is 0.00.

## Where is the best place to locate a rain gauge?

In open areas place the gauge top approx. 2 feet off the ground. In developed areas place the gauge top approx. 5 feet off the ground.

## How wide should a rain gauge be?

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.

## Is 1mm of rain per hour a lot?

Heavy (thick) drizzle: Impairs visibility and is measurable in a raingauge, rates up to 1 mm per hour. … Slight rain: Less than 0.5 mm per hour. Moderate rain: Greater than 0.5 mm per hour, but less than 4.0 mm per hour. Heavy rain: Greater than 4 mm per hour, but less than 8 mm per hour.

## What is heavy rainfall?

It is defined as rainfall greater than 100 mm in 24 hours. …

## Which rain gauge is most accurate?

Top 6 Rain Gauges Review 2020Editor’s Choice. Stratus Precision Rain Gauge. … Best Electronic Rain Gauge. AcuRite 00899. … Best Value for Money. La Crosse Technology 724-1710. … Best Home Weather Station. Rain Gauge for Netatmo Weather Station. … Best Manual Rain Gauge. OutdoorHome 6″ Rain Gauge. … Budget Pick.

## How do you calculate rainfall per hour?

Search to find the detailed rainfall collections if you want more detailed rainfall intensity data. If all available is monthly average in mm, take the monthly average and divide by number of hours in that month. So if you had 300 mm in April, take 360 mm/(30 days * 24 hours) = 0.5 mm/hour average monthly intensity.

## Does the size of a rain gauge matter?

The larger the opening, the lower the statistical error in measurements in real-world applications. Always choose the largest size that your budget allows. Rain gauge resolution determines the smallest amount of precipitation that one is able to measure and the accuracy of short-term rain intensity measurements.

## What does 1mm of rain look like?

1mm rainfall means every one square meter area is filled with the water of height 1mm. So 1mm rain means 1000mm length × 1000mm breath × 1mm height = 1litre of water.