Ogallala Aquifer - is a vast underground water table. It is one of the worlds largest. As you can see, Nebraska is almost completely over it. How did it get it's name? In 1898 N.H. Darton named it after Ogallala, Nebraska.
Covering eight States, Ogallala Aquifer's dramatic drying - sows deep concerns for High Plains agriculture; 45 years of well data shows near 100-foot declines in some TX counties - almost all of it used during the drought for agriculture. As vast as the High Plains aquifer is, it spans 8 States & holds nearly 3billion acre-feet of water & it could still run dry in less than 50 years says a KS study. Also see: http://www.texasalmanac.com/topics/environment/aquifers-texas