While drinking water intake usually varies between 2 and 3 liters\/person\/day and other domestic water requirements for personal and household hygiene necessitate between 30 and 300 liters\/person\/day, the production of food requires much more: between 2,000 and 5,000 liters\/person\/day.<\/p>\n
Most of the water that is used on crop production comes from rain that is stored in the ground (known as green water).<\/p>\n
Worldwide, rainfall provides 90% of the water used by crops.<\/p>\n
Of the world\u2019s total land area, 13 billion hectares (ha), 12% is cultivated and approximately 27% is used for pasture. Of the 1.5 billion ha used for crops, 277 million ha of this is irrigated (18%).<\/p>\n
In terms of population, crops equate to .25 ha\/person.<\/p>\n
Historically, irrigation comprises between 70% and 80% of all water uses. There are some countries that use up to 90% of their water for irrigation.<\/p>\n
As a result of increased cropping intensity, the area of harvested crops under irrigation is expected to increase 30% by 2030.<\/p>\n
Also by 2030, the amount of water that is expected to be allocated to irrigation will go up by 14%.<\/p>\n