A DRILLED WATER WELL consists of an excavation or structure created in the ground by boring or drilling to access groundwater in underground aquifers. This process is usually done by rotating a hollow drill pipe with a BIT on the bottom. Pushing high volumes of air through the drill pipe and out the bit at such force that the air will blow the drilled materials (cuttings) up and out of the hole with the upper part being lined with casing.
The CASING does a triple action, preventing the collapse of the borehole walls, providing housing for a pump mechanism and for the pipe. This action allows the water to move from the pump to the surface.
The casing must have a DRIVE SHOE attached to the bottom to prevent damage while driving the pipe to make a good seal with the formation. Drilling for water is a demanding operation where rock conditions can vary from work site to work site.
Below the casing, the lower portion of the borehole is the INTAKE through which water enters the well. The intake is an open hole in the formation below the casing. The Washington State Department of Ecology requires your well driller to log the formation of the geological conditions of your well as it deepens.
When the well is near completion, your driller blows the water with air to determine the yield amount. Then a process called BLOWING begins, this develops the water well, allowing the thick dirty drilling mud out and lets new & fresh water in.
After your water well is completed, a temporary cap is welded onto your wellhead, to prevent any debris from entering the well. A permanent vented cap will be replaced when your pumping system is installed.