To ensure that the new borehole provides a secure public water supply without damaging nearby wetlands.
The contingency borehole has made this pastureland available at a critical time and a lot of families have moved into the area.
The main source of water for the park comes from a borehole drilled 90 meters into a chalk aquifer.
When the coal has been under-cut for a sufficient length, the struts are withdrawn, and the overhanging mass is allowed to fall during the time that the workmen are out of the pit, or it may be brought down by driving wedges, or if it be of a compact character a blast in a borehole near the roof may be required.
A pipe is passed down the borehole to the desired depth, and connected with air-compressors at the surface.