Drone used to estimate size of NC coal ash spill

RALEIGH, N.C. — (AP) A team of academic researchers equipped with a drone estimate that about 35 million gallons of coal ash and contaminated wastewater spilled into the Dan River earlier this month.

Wake Forest University researchers released results Tuesday from a study using photos collected by the drone that flew over the Duke Energy coal ash dump that ruptured Feb. 2 in Eden. The scientists used images captured by the drone to create a digital three-dimensional model of the pit, allowing them to calculate the volume of toxic ash that flowed out when a pipe collapsed.

The reported amount equals about 53 Olympic-sized swimming pools, making it the third largest coal ash spill in the nation's history.

The independent measurement is within the broad range that Duke's engineers had initially estimated.

WSOC