borehole drilling, pumping and maintenance

Groundwater – A Precious Resource

Groundwater is created by rainfall and surface water penetrating the ground. In the East Anglian and East Midlands region 50% of our water is obtained from underground reservoirs called aquifers. The remainder is from surface reservoirs and rivers. Water is stored in underground aquifers of gravel / sandstone / chalk and limestone which can be found at differing levels and between non-permeable layers.

The major aquifer in the region is chalk. Groundwater is typically of excellent quality but does vary depending on the hydrogeology and mineralogy of the aquifer. Water treatment is used to modify water which is affected by this.

The Environment Agency is responsible for protecting the quality of raw water resources and issuing licences to abstract water.

Groundwater Applications

  • Reservoir storage
  • Agriculture
  • Irrigation
  • Domestic
  • Commercial and Industrial water supply
  • Geothermal Heat pumps

Groundwater Abstraction – Borehole Drilling and Borehole Pumps

A drilled well usually consists of a hole drilled to a depth where a water-bearing stratum (aquifer) is reached and lined with steel or PVC casing. If the aquifer supplies ample clean water, a screen surrounded by a gravel pack is installed. The pumped water is filtered by the gravel pack. Drilled wells can be developed in soil, gravel or solid rock, as special well drilling machines are available for different underground formations. It is advisable to provide a cement seal between the casing and the strata at the top of the borehole to prevent surface water from entering the borehole.

When the groundwater level is below the surface by more than 6-7 metres, a submersible borehole pump is suitable for the majority of wells.

The electro-submersible borehole pumping unit consists of an electric motor which is designed to operate underwater, the internals being filled with water for lubrication and cooling purposes. This arrangement prevents any contamination of the pumped liquid. The motor is close coupled to a multi-stage pump which discharges in the rising main at the head and flow required.

One of the key advantages of a submersible unit is that it requires very little surface equipment and if applied correctly will operate satisfactorily and unobtrusively for many years without need for great attention.

At Panks Engineers we have the capability to drill boreholes, supply and install submersible pumps and make a full assessment of your groundwater requirements. We have hydro-geological knowledge of the Anglian region dating back well over 100 years. We are a member of the Well Drillers Association and can provide a complete solution from abstraction to delivery.