Over 40 years experience drilling water bores
When you contact Griffiths Drilling about your water bore, you are talking to a drilling team with
over 40 years experience in this region. Our water bore drilling operations are mainly carried out
within the Wellington, Hutt Valley, Kapiti Coast and Wairarapa regions, giving us a comprehensive
knowledge of the ground aquifers within these areas. Please
contact
us
today to discuss your water bore requirements.
Some useful information about water bores
Groundwater
Groundwater is mostly the result of some of the rainfall in the hydrologic cycle being absorbed by
the ground (recharge). The amount of water that may exist is governed by the porosity and
permeability of ground material. The geological history and the forming of the landscape, current
topography, recharge rates and water use all influence the existence, or not, of groundwater.
Aquifers may be unconfined (water table) or artesian (confined) depending on the recharge point and
the strata surrounding the aquifer.
Consent for water bores
Before water bore drilling can commence you must obtain Resource Consent for your bore from the
Regional Council. Contact them directly to discuss your plans or visit their website which has the
necessary forms and information to apply for the consents needed. Once you receive the documents
you are welcome to contact us so we can answer any questions you may have. Prior to mobilisation,
we need you to provide us with a copy of the consent, including the specified conditions.
Water bore casing
Casing is a strong pipe used to prevent the borehole collapsing and provides a barrier to prevent
surface contaminants entering the aquifer. On completion of the bore the top of the casing will sit
above ground level. For domestic and stock water situations we use 125mm (5 inch) well casing.
Well screen
Generally, to maximise the collection area available, a slotted screen is used to increase the
intake area of the water bore. The slot size is designed to minimise the entry of solids into the
well. The well screen fits inside the casing and the casing is pulled back to expose the slotted
area.
Water bore development
This is done to clear any silt/sand from the material surrounding the well screen in the hole to
ensure clean water and increase permeability of the water bearing area. Development time will
depend on the conditions encountered.
Pump testing
The pump test is a preliminary test to determine if the required quantity of water is available
from the bore. It is also done to monitor the water level after an extended period of pumping
(drawdown) to ensure that the water level does not fall below that needed to operate the pump. A
preliminary test is done before installing a screen in the water bore. After developing the well
another pump test will be done to determine the yield from the bore.
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