(AP) — A special report by the University of Nebraska-Lincoln’s Conservation and Survey Division shows that groundwater levels dropped last year in key spots.

The report looks at readings from five wells in regions with a high density of irrigation wells and because of their historically significant water-level changes.

All five of the selected sites saw a water-level decline from the spring of 2012 to the spring of 2013, ranging from 1.85 feet to 5.5 feet. The wells were in Perkins, Box Butte, Antelope, Fillmore and Hamilton counties.

Groundwater resource coordinator Aaron Young says the special report’s findings are consistent with historical trends, but is not intended to be a comprehensive study of the effects of the 2012 drought.