Dw drum dating
The system was extensively restored and further extended during the reign of King Parakrama Bahu (1153–1186 CE).
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.
With this instrument, planners and farmers could make better use of the information gathered in the survey.
The irrigation canal system predates the Hohokam culture by two thousand years and belongs to an unidentified culture.
The lake swelled annually from flooding of the Nile.
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.
Between the 7th and 14th centuries, they also built and maintained extensive irrigation networks along the lower Salt and middle Gila rivers that rivaled the complexity of those used in the ancient Near East, Egypt, and China.
There is evidence of the ancient Egyptian pharaoh Amenemhet III in the twelfth dynasty (about 1800 BCE) using the natural lake of the Faiyum Oasis as a reservoir to store surpluses of water for use during the dry seasons.Ancient Persia (modern day Iran) used irrigation as far back as the 6th millennium BCE to grow barley in areas where natural rainfall was insufficient.The Qanats, developed in ancient Persia in about 800 BCE, are among the oldest known irrigation methods still in use today.Perennial irrigation was practiced in the Mesopotamian plain whereby crops were regularly watered throughout the growing season by coaxing water through a matrix of small channels formed in the field.Ancient Egyptians practiced Basin irrigation using the flooding of the Nile to inundate land plots which had been surrounded by dykes.