Most modern rain gauges generally measure the precipitation in millimetres in height collected during a certain period, equivalent to litres per square metre. Previously rain was recorded as inches or points, where one point is equal to 0.254 mm or 0.01 of an inch.
How is rainfall measured?
The standard instrument for the measurement of rainfall is the 203mm (8 inch) rain gauge. 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.
What is area of rain gauge?
Rain gauge is a meteorological instrument for determining the depth of precipitation (usually in mm) that occurs over a unit area (usually one metre square) and thus measuring rainfall amount. One millimetre of measured precipitation is the equivalent to one litre of rainfall per metre square.
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 many types of rain gauges are there?
Measuring rainfall can be is primarily done in three different ways using three different types of rain gauges. The three major types of rain gauges are the standard gauge, tipping bucket gauge and weighing gauge.
Why is rain measured in cm?
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 the meaning of 1 cm rain?
1 cm of rainfall means that a volume of water equal to 10 L has fallen over an area of 1 m²; ergo, the basic conversation for rainfall depth (say mm) to volume is: 1 mm of rainfall depth equates to 1 L of rainwater per m². Hope this helps.
What does 1mm of rain look like?
1mm rainfall means every one square meter area is filled with the water of height 1mm. … Rainfall rate is generally described as light, moderate or heavy. Light rainfall is considered less than 0.10 inches of rain per hour. Moderate rainfall measures 0.10 to 0.30 inches of rain per hour.
Where should rain gauge be?
The gauge should be placed on level ground, ideally in a sheltered location with no ground falling away steeply on the windward side. Obstructions such as trees and buildings, which affect local wind flow, should be a distance away from the gauge of at least twice their height above it.
What is the best position for a 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.
What is rain gauge explain?
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 is rain measured using a rain gauge?
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.
What is the use of rain gauge?
Make and use a rain gauge, an instrument used to collect and measure precipitation (falling water). It measures the depth of the water that would cover the ground if the rain did not drain away or evaporate.