The recording rain gauge also gives the duration of the rainfall as well as the intensity of the rainfall at any given time. Rain is an essential component of the water cycle and is an inevitable source of freshwater on the Earth. Each time the collector tips, the strain gauge (weight sensor) is re-zeroed to null out any drift. Rainfall measurement is a vital requirement for many aspects of agriculture, forestry, The manual method of rainfall measurement is the simplest method of rainfall measurement. This method basically includes the measurement of rainfall by means of an instrument which is known as a rain gauge.
To alleviate this, a gauge may be equipped with an automatic electric heater to keep its moisture-collecting surfaces and sensor slightly above freezing.
The recording rain gauges can be further classified into the following types:Some of the factors that must be considered for the selection of the rain gauge stations are as follows:1. In an enclosed space below each is a Ian Strangeways, A History of rain gauges, TerraData, 2010Kosambi (1982) The Culture and Civilization of Ancient India in Historical Outline, p. 153, :A short history of the British Rainfall Organisation by DE Pedgley, Sept 2002, published by The Royal Meteorological Society This is also to prevent the water collected on the roofs of buildings or the leaves of trees from dripping into the rain gauge after a rain, resulting in inaccurate readings. A rain gauge can be thus defined as the instrument that is used for the measurement of rainfall that works by sampling the incidence of rainfall at a specific point basically through an orifice of a known area. The rain gauge must not be surrounded by any object at least up to 30m.2. When it tips, it actuates a switch (such as a Tipping gauges can also incorporate elements of weighing gauges whereby a strain gauge is fixed to the collection bucket so that the exact rainfall can be read at any moment. This is extremely helpful for scientists studying the effects of greenhouse gases released into the atmosphere and their effects on the levels of the The tipping bucket rain gauge consists of a funnel that collects and channels the precipitation into a small The tipping bucket rain gauge is not as accurate as the standard rain gauge, because the rainfall may stop before the lever has tipped.
Since the earliest years of weather records, the de facto standard for the measurement of daily rainfall has been the 0900 UTC reading made by an observer from a 5 inch storage rain-gauge. We are sorry that this post was not useful for you! plot of cumulative rainfall vs time. In this method, the intensity and the amount of rainfall is measured by a rain gauge while the extent, location and the movement of rainfall is measured by the microwave radar.
Attempting to collect rain data in a Another problem encountered is when the temperature is close to or below freezing. This is done to minimize the wind effect.Rainfall measurement by radar is basically an integrated system for the rainfall measurement that makes use of the microwave radar. The station must lie on a level and open ground so that the gauge can represent a horizontal catch surface. The measurement of the rainfall is done by removing the funnel, emptying the rain in the container into a graduated cylinder with a 1½ inch diameter. The rim of the circular collector must be set at a horizontal plane at a height of about 30.5cm above the ground level. When the next period of rain begins it may take no more than one or two drops to tip the lever. The most commonly used non-recording rain gauge is the Symon’s rain gauge.Figure: Non-recording Rain Gauge (Symon’s rain gauge)Recording Rain Gauge is defined as the type of rain gauge that delivers a permanent automatic record of the rainfall. Tipping buckets also tend to underestimate the amount of rainfall, particularly in snowfall and heavy rainfall events.Modern tipping rain gauges consist of a plastic collector balanced over a pivot. Instruments. This is essentially a circular funnel with a diameter of 203mm which collects the rain into a graduated and calibrated cylinder.
The arrangement of the circular collector and the discharging funnel is kept inside a metallic container. The reading should be done at eye-level and to an accuracy of 0-01 inch. The standard instrument for the measurement of rainfall is the 203mm (8 inch) rain gauge.