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after he introduced irrigation to the Yellow River valley.
There are some areas/places in the world who experience lack of rain fall seasonally and their irrigation is necessary .
Farmers get their water by the irrigation. (called the Central Valley Project)
the people of the Indus Valley were creating an irrigation system
Coastal valley
Complex irrigation systems.
provides water for irrigation
They used Canals.
San Francisco bay
No it is Mississippi
the California aqua duct
Sam H. Johnson has written: 'Costs and returns for selected crops in Closed Basin, San Luis Valley, Colorado, 1974' -- subject(s): Economic aspects, Economic aspects of Irrigation farming, Irrigation farming, San Luis Valley Project, Statistics 'Can farmers afford to use the irrigation wells after turnover?' -- subject(s): Irrigation pumps, Irrigation, Management