When you consider climatic distribution of Sri Lanka you can see that there are three main climate zones in the island; Wet, Intermediate and Dry.
Wet Zone receives rain from the South West Monsoon winds at certain times of the year. Dry Zone receives rain from the North East Monsoon winds at certain times of the year. The Intermediate Zone receives rain from both types of monsoon winds, but not always.
South West Monsoon winds blow across a large area of the Indian Ocean and carry a relatively high volume of water vapor. This brings heavy rains to the Wet Zone from May to September.
North East Monsoon winds blow from the Indian sub continent, crossing a small strip of ocean. These winds are low in humidity and produce relatively little rain (still they cause floods at some places) for the Dry Zone during October to February.
It is the Dry Zone which suffers most from water scarcity. Hence, the necessity of a water conservation / management system like Ellanga, naturally made its first appearance in history in the Dry Zone.
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Ellanga System / Cascaded Tank-Village SystemNon-Fiction
In Rome, on 19th April 2018, Food and Agriculture Organization (FAO) of the United Nations designated Sri Lanka's ancient yet still functional irrigation mechanism known as Ellanga System (to be more analytical and technical; Cascaded Tank-Village S...