What is a hydrogeological survey?
3.1 Hydrogeological Structures and their Geophysical Models The task of a geophysical survey is to assess the extent of individual elements of a hydrogeological structure and classify them on the basis of their physical properties. One of the basic elements of sedimentary hydrogeological structures is the bed.
What is bore hole survey?
Borehole surveys are utilised to determine the geological and geotechnical parameters, giving vital information for later stages of planning. In mining this improves a drill hole by scanning the rocks within a radius of the drill hole giving crucial information about the lithology which the drill may have just missed.
Do I need a Licence for a bore hole?
Do I need a licence or permission? Not usually. Anyone is allowed to extract up to 20,000 litres per day without a licence or a charge.
How deep does a bore hole need to be?
between 60m and 80m
How deep should be a borehole be? There is no set answer for how deep a borehole needs to be. Put simply the borehole should be as deep as is required to reach the aquifer (water bearing rock). The average depth of a borehole is between 60m and 80m but this can be less as well as significantly more.
What is hydrogeological data?
Hydrologic information is used to conceptualize the movement of groundwater through the system. Water level measurements are used to estimate the general direction of groundwater flow, the location of recharge and discharge areas, and the connection between aquifers and surface water systems.
What is hydrogeological setting?
The hydrogeological setting of a peatland is defined by the nature and hydraulic conductivity of the geological material adjacent to and underlying the organic deposits. This process has been suggested to be an important mechanism to maintain peatland water levels (Ingram and Bragg, 1984).
What is borehole surveying write the purpose of borehole surveying?
The MWD borehole surveying is performed essentially to provide the ongoing azimuth direction of the drill bit, the deviation angle of the drill pipe from the vertical (inclination) and the tool face angle as well as the coordinates of the bottom hole assembly (BHA) [2].
What does a borehole do?
A borehole is drilled for extraction of minerals relying on a process that uses high-pressure water. The water jets make it possible to drill into hard rock, whether in an open-pit floor, underground mine space, land surface, or from a vessel in the sea or on a lake.
How long will a bore hole last?
As a general rule of thumb, a properly installed and sized borehole should last 8-10 years. If you have only just installed a borehole, you’re likely to see years of service from your current equipment. This is extendable with good care and frequent maintenance.
Does a borehole use a lot of electricity?
How much electricity does a borehole pump use? This depends on the scale of the submersible pump installed but typically a small pump for normal use, e.g. less than 20m3/day abstraction will be very cheap to run.
How is the borehole site investigation carried out?
The borehole site investigation was carried out in a multi- step approach which included: a) A desk study and data acquisition phase, by use of topographic maps, satellite photo analysis, existing studies, geological reports, maps and borehole records.
Why is it important to do a hydrogeological survey?
Hydrogeological surveying is conducted prior to drilling a borewell in order to ascertain the quality and quantity of water available at a particular location. It has been well established that underground water is a better source of drinking water than surface water. This is due to the following reasons:
Where was a hydrogeological survey conducted in Kenya?
A hydrogeological investigation was conducted for the Osembe African Devine Church, Kisumu District, Kenya for the purpose of constructing a borehole or shallow well-drilling area. As per the survey, the site consists of volcanic rock, mainly basalt, andesite and rhyolite. The Resistivity Method was used for Geophysical fieldwork.
What makes the walls of a borehole clog up?
Development In borehole engineering, this is the general term for procedures applied to repair the damage done to the formation during drilling. Often the borehole walls are partially clogged by an impermeable “wall cake”, consisting of fine debris crushed during drilling, and clays from the penetrated formations.