✯Rain gauge
A rain gauge is an instrument used by meteorologists and hydrologists to measure precipitation (e.g. rain, snow, hail or sleet) in a certain amount of time. It is usually measured in millimetres.
What is rain gauge and its types?
There are two types of rain gauges, non-recording type and recording type. Rain gauge is a type of instrument used by meteorologists and hydrologists to measure rainfall rate in a certain period of time. Rain gauges are also known as udometer, pluviometer and ombrometer.
How is total rainfall calculated?
The total annual rainfall = Sum of rainfall in all twelve months. Therefore, annual rainfall is 128.7 cm.
How many Litres is 1mm of rain?
With a rainfall of 1 mm, every square metre receives 1 litre of rain water. A rainfall of 1 mm supplies 0.001 m3, or 1 litre of water to each square metre of the field. Thus 1 ha receives 10 000 litres. What is the total amount of water received by a field of 5 ha under a rainfall of 15 mm?
Why is rain measured in cm?
But more importantly, why does a unit of length measure something like rainfall? The short answer is rain gauge. … So when you see a rainfall reading in millimetres or centimetres, it is simply the height to which the collected water rose in the funnel of the rain gauge.
How is rain measured in cm?
The gauge has a sharp brass or steel rim of diameter 5 inches (127 mm), sited 30 cm above ground level with a funnel that collects rain in a narrow necked bottle placed in a removable can. To make the rainfall measurement, the observer empties the collected rain into a graduated glass rain measure.
Why rainfall is measured in Millimetres?
Rainfall is extremely variable, both over time and between different locations, which makes it very difficult to measure. 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.
Is 1mm rain 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.
How many Litres are in 10 mm of rain?
For your specific question: 10 mm of rain means 10 litres per square metre.
How do you measure rainfall at home?
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.
What is total rainfall?
the amount of water falling in rain, snow, etc., within a given time and area, usually expressed as a hypothetical depth of coverage: a rainfall of 70 inches a year.
How do you calculate monthly rainfall?
Add together all of the monthly rainfall totals in your sample data. You’ll be adding measurements in inches because rainfall is generally measured in inches in the United States. Divide by the number of years in your data set to arrive at the average monthly rainfall for any location.
How do you calculate rainfall per hour?
DEFINITIONS
- Violent rain: If 2” of rain have fallen in 10 minutes, then the equivalent rainfall rate in terms of in/hr will be 60 min / 10 min * 2” of rain = 12 in/hr.
- Heavy rain: If 15 mm of rain have fallen in 30 minutes, then the equivalent rain rate in terms of mm/hr will be 60 min / 30 min * 15 mm of rain = 30 mm/hr.
How many Litres does it rain?
One cubic centimetre is a millilitre and hence the volume of water is 10000 milliletres. Finally there are 1000 millilitres in a litre so the volume of rain is 10000/1000 = 10 litres.
What is effective rainfall?
Effective rainfall (or precipitation) is equal to the difference between total rainfall and actual evapotranspiration. Effective rainfall can be calculated directly from the climatic parameters and the useable ground reserves (RU).
How do you calculate rainfall in Litres?
Roughly speaking, 1 millimetre of rain over 1 square metre of roof equals 1 litre of water. This capacity can be calculated using the following formula: Annual rainfall (in millimetres) x Roof surface area (in square metres) = Roof catchment capacity.
Is 15mm a lot of rain?
15 mm of precipitation means 15 kilograms of water per square meter of the Earth’s surface, and that’s quite a large amount — one and a half buckets of water. Given the fact that the Earth’s surface is uneven, precipitation flow into low-lying areas, forming turbulent streams and deep puddles.
What does 200 cm rainfall mean?
Measuring rainfall as a depth has become an international standard mainly because it is very easy to convert depth to volume; in fact, the main conversion factor is 1 mm of rainfall = 1 Liter of water/m² (or 0.001 m³ of water/m²); thus, to answer your question, 200cm or rainfall (or 2000 mm) means that every squared …
What is a light rain?
Rain and drizzle are the only forms of liquid precipitation. Rain is classified as light, meaning rain falling at a rate between a trace and 0.10 inch per hour; moderate, 0.11 to 0.30 inch per hour; heavy, more than 0.30 inch per hour.
How many types of rain gauges are there?
The three major types of rain gauges are the standard gauge, tipping bucket gauge and weighing gauge.
What is point rainfall?
(meteorology) The rainfall during a given time interval (or often one storm) measured in a rain gage, or an estimate of the amount which might have been measured at a given point.