Hydrofracturing has proven to be an effective remedy for low yielding bedrock wells. It is a process in which pressurized water, at levels as high as 3500 psi, is pumped through the well into the bedrock formation, to increase the size or number of water bearing fractures that are supplying the well.
The first step in the process is to remove any existing pumps or piping from the well. The packer is then placed a minimum of 80 below ground surface to seal off the top of the well and prevent surface contaminants from entering the well. The packer is then inflated and clean pressurized water is pumped through the packer into the well. The water pressure in the well will continue to rise as the rock formation resists the flow of the pressurized water. The increased pressure will force the fractures in the bedrock to widen and/or become longer and will also remove sediment and mineral buildup that may have settled in the fractures. The water pressure will then drop and the water will normally exit through the walls of the well.
Drop in water pressure is the usual indicator that the hydrofracturing procedure is successful. The packer is then deflated, the equipment is removed from the well and the pump and piping are re-installed in the well.
The hydrofracturing process has been more than 95% successful in increasing well yields. A yield test can be performed after the hydrofracture to determine the success of the procedure.