Most irrigation methods are inefficient because water often evaporates or seeps into the ground before it reaches the crops.
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The most important invention of the Sumerian's was Irrigation. Irrigation is how the Sumerian's led their water through pipes, etc.
irrigation
They built a series of canals Most nile irrigation takes the form of "flood irrigation" rises (annually) in flood. they also used a counterbalanced device called a "shadouf" to rise water to irrigation trenches when thelevel of the river had dropped-again these are still in use in some rural areas around the river.
Irrigation first began in China in 500 B.C.
they were using irrigation.