WORLD CIVILIZATION

Detailed explanation-1: -Food shortages had forced settlers in Mesopotamia to move from the foothills down to the river valley. There, farmers faced the problem of having either too much water or too little. To control the water supply, Sumerians built a complex irrigation system.

Detailed explanation-2: -Controlling Water Later people built canals to protect houses from flooding and move water to their fields. To solve their problems, Mesopotamians used irrigation, a way of supplying water to an area of land. To irrigate their land, they dug out large storage basins to hold water supplies.

Detailed explanation-3: -Six thousand years ago, on the Tigris-Euphrates floodplain in Mesopotamia, Sumerian irrigation practices caused a salt build-up in water and soils that inhibited food production and no doubt contributed to the decline of Sumerian culture.