A Borehole/Spring yield or pump test is a controlled experiment in which a borehole (well) is pumped at a controlled rate and water-level response (draw down) is measured. BES can carry out a Yield test for both domestic and commercial boreholes where a licence is required by the Environment Agency.
https://www.drilcorp.com/bes-carry-borehole-remediation-works-essential-cctv-surveys/
