Rainfall essay in 250 words
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Answer:
Who doesn't loves rainfall ? It's quixotic to feel the rain washing away old memories but there is something so innate about the sound of rainfall that you almost imagine life begins anew. ... Either way, the rain elicits such a barrage of emotions; especially when it is inundatory and new. The first rain exposes this range of emotions and feelings.
Long stretches of rainy weather can cause pain. ... Rain can also cause sadness. A lack of sunlight exposure can lead to an increased production of melatonin, making you feel sleepy. In turn, your body will produce lower levels of serotonin, the neurotransmitter that affects mood, appetite, sleep and etc. If you feel down during a downpour, it's not your imagination: Bad weather can indeed have a negative effect on your emotions.In fact, weather can make you downright SAD. SAD, of course, being an acronym for Seasonal Affective Disorder. It usually occurs in winter months when there is less sun. ... But because of this increased desire to do nothing, our bodies create less serotonin, which in turn affects our mood – so SAD makes people feel sad.
Some people feel happy in rain.But why does rain make you happy? ... Vice quotes therapist and anxiety and depression specialist Kimberly Hershenson, who explains, "Rain produces a sound akin to white noise. The brain gets a tonic signal from white noise that decreases this need for sensory input, thus calming us down.So most of the people love to enjoy the rainfall. THe drops pouring on them reaching to their souls.
Rainfall is a natural process in which atmospheric vapour changes into water. The water so formed then travels from atmosphere to earth. The term precipitation is also used for rainfall.
Rainfall occurs when the capacity of an air mass to hold the vapour exceeds because of the following reasons:
(1) Hot air has large capacity to hold the vapour particles in suspension. When air gets cooled the capacity of air mass to hold vapour particles is reduced and the vapour precipitates in the form of water.
(2) Sometimes variations in pressure bring about the change of state from vapour to rainfall.
The yearly, monthly or daily rainfall is expressed in centimetres or millimetres of depth over a particular area which receives the precipitation.
Definition of One Centimetre Rainfall:
Suppose the water precipitated on a certain plain area in the form of a rainfall is not lost in any manner and if there is no runoff and evaporation whatsoever then all the water will go on accumulating on the surface of the area in the form of a layer. When the layer of this deposited water is one centimetre thick, it is said that one centimetre rainfall has occurred.
Essay # 2. Distribution of Rainfall:
Rainfall received during specified intervals like week, month or season indicate its distribution, which can be known by the rainy days, dry spells and wet spells. Distribution of rainfall in more important than total rainfall in a season for optimum crop yield. Yield levels depends on the amount of rainfall above the basic minimum required by the crop to achieve maturity. Yields, however, are not directly proportional to the rainfall.
On any particular day if the rainfall received is more than or equal to 2.5 mm, it is called a rainy day (meteorological rainy day). A day receiving more than 5 mm rainfall is called as crop rainy day. Number of rainy days indicates rainfall distribution in a season. Distribution is considered good if the rainfall is received in more number of rainy days.
All the intense rain received in a single occasion may not be entirely useful for crop. Part of it may be lost as surface runoff, deep percolation beyond root zone or by evaporation of rain intercepted by foliage. The extent of its utility in any given region determines effectiveness of rainfall or rainfall efficiency. Fraction of the total rainfall available for the consumptive use of crop is called effective precipitation (EP) or effective rainfall (ER).
Major factors influencing EP are:
1. Rainfall characteristics—amount, intensity and distribution of rainfall.
2. Land and soil characteristics—land topography, soil texture, structure, bulk density, permeability and infiltration.
3. Groundwater contribution.
4. Management factors—tillage, bunding, terracing, ridging, mulching etc., aimed at minimising surface runoff.