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29-Jun-2017 21:30

In addition to underground canals, the Sinhalese were the first to build completely artificial reservoirs to store water.Due to their engineering superiority in this sector, they were often called 'masters of irrigation'.Přečtěte si další informace, mimo jiné i to, jaké máte možnosti: zásady používání souborů cookie.Irrigation is the application of controlled amounts of water to plants at needed intervals.It was installed in irrigation tanks as part of a nationwide system to measure and collect rainfall for agricultural applications.With this instrument, planners and farmers could make better use of the information gathered in the survey.Irrigation has been a central feature of agriculture for over 5,000 years and is the product of many cultures.

Sophisticated irrigation and storage systems were developed by the Indus Valley Civilization in present-day Pakistan and North India, including the reservoirs at Girnar in 3000 BCE and an early canal irrigation system from circa 2600 BCE.

By 150 BCE the pots were fitted with valves to allow smoother filling as they were forced into the water.

The irrigation works of ancient Sri Lanka, the earliest dating from about 300 BCE, in the reign of King Pandukabhaya and under continuous development for the next thousand years, were one of the most complex irrigation systems of the ancient world.

In the Zana Valley of the Andes Mountains in Peru, archaeologists found remains of three irrigation canals radiocarbon dated from the 4th millennium BCE, the 3rd millennium BCE and the 9th century CE.

These canals are the earliest record of irrigation in the New World.The oldest known hydraulic engineers of China were Sunshu Ao (6th century BCE) of the Spring and Autumn period and Ximen Bao (5th century BCE) of the Warring States period, both of whom worked on large irrigation projects.In the Sichuan region belonging to the State of Qin of ancient China, the Dujiangyan Irrigation System devised by the Qin Chinese hydrologist and irrigation engineer Li Bing was built in 256 BCE to irrigate a vast area of farmland that today still supplies water.The Qanats, developed in ancient Persia in about 800 BCE, are among the oldest known irrigation methods still in use today.