Some irrigation battles in California involve ten times that amount.

ECONOMIST: Western water rights

Because much of the loss to insects and diseases occurs after the plants are fully grown, the use of genetically engineered varieties that have higher post-harvest yields means that the farming (and irrigation) of fewer plants can produce the same total amount of food.

FORBES: Move up http://i.forbesimg.com t Move down

Because hemp requires much less irrigation, and around half as much land as cotton to produce the same amount of textile, supporters of legalisation say it is much more environmentally friendly.

BBC: Hemp: Could the US rekindle its love affair?

Glaciers, ice fields, and snowpack store an immense amount of fresh water and gradually release it to meet year-round needs for irrigation, drinking, sanitation, industrial processing, clean energy, and food production.

FORBES: Should Countries With No Water Be Pushing for Growth?