educ.psu.edu: The sumerian city-stateArkiveret 4. juni 2009 hos Wayback Machine Citat: "...The people who established the world's first civilization around 3500 B.C. in southern Mesopotamia were known as the Sumerians. The Sumerians learned to control the Tigris and Euphrates Rivers by constructing levees and irrigation canals. As a result, a stable food supply existed, and the Sumerian villages evolved into self-governing city-states..."
Sandra Postel: Egypt's Nile Valley Basin Irrigation Citat: "...The earliest evidence of water control in ancient Egypt is the famous historical relief of the mace head of Scorpion King which dates to around 3,100 BC. It depicts one of the last predynastic kings, holding a hoe and ceremoniously cutting a ditch in a grid network. Besides attesting to the importance of these waterworks and the great ceremony attached to them, this picture confirms that Egyptians began practicing some form of water management for agriculture about 5,000 years ago.[4]...", [4] Karl W. Butzer, Early Hydraulic Civilization in Egypt: A Study in Cultural Ecology (Chicago: The University of Chicago Press, 1976); quote from M.S. Drowser, "Water-Supply, Irrigation, and Agriculture," in C. Singer, E.J. Holmyard, and A.R. Hall, eds., A History of Technology (New York: Oxford University Press, 1954).
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educ.psu.edu: The sumerian city-stateArkiveret 4. juni 2009 hos Wayback Machine Citat: "...The people who established the world's first civilization around 3500 B.C. in southern Mesopotamia were known as the Sumerians. The Sumerians learned to control the Tigris and Euphrates Rivers by constructing levees and irrigation canals. As a result, a stable food supply existed, and the Sumerian villages evolved into self-governing city-states..."
