Water reductions with GROW BIOINTENSIVE techniques may be as much as 88% for vegetables and as much as 67% for grains.1
This is important as, while nearly 70% of the planet is covered by water, only 2.5% of this water is fresh. The rest is saline and ocean-based. Even then, just 1% of our freshwater is easily accessible, with the remainder trapped in glaciers and snowfields. 70% of this easily accessible freshwater is presently used to grow food crops2.
1) Biointensive Sustainable Mini-Farming, Journal of Sustainable Agriculture, Vol. 19(2) 2001.