▪ IRRIGATION The huge Ogallala aquifer in the United States has become so depleted that irrigated land in northwest Texas has shrunk by a third for lack of water.
▪ NIISUTAMINE Ogallala tohutu põhjaveeala Ameerika Ühendriikides on nii tühjaks ammutatud, et niisutatav maa Loode - Texases on veepuuduse tõttu kolmandiku võrra kahanenud.