Sunday, February 9, 2014

"Whatever the future of Iran's qanat system may be, it stands out today as an impressive example of a determined and hardworking people's achievement. The 22,000 qanats in Iran, with their 170,000 miles of underground conduits all built by manual labor, deliver a total of 19,500 cubic feet of water per second - an amount equivalent to 75 percent of discharge of the Euphrates River into the Mesopotamian plain. This volume of water production would be sufficient to irrigate three million acres of arid land for cultivation if it were used entirely for agriculture. It has made a garden of what would otherwise have been an uninhabitable desert."
by H. E. Wulff, The Qanats of Iran, Scientific American, April 1968