Technology used for decades in mining is now helping with groundwater research in Nebraska.
An electromagnetic device on a helicopter can survey hundreds of feet below ground.
Jesse Korus at the University of Nebraska-Lincoln says information so far shows valleys filled with glacial rocks.

Korus says this method is a less expensive way to survey great distances, but still uses existing well information to fine tune the data.

He says the information will help protect water supplies.
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Korus says the team continues to get new data from flight surveys done this summer.
He expects new discoveries will be made once the information is analyzed.