BOREHOLE SIGHTING
It is basically defined as ‘’the searching of groundwater using scientific methods’’
The importance includes:
- selecting a suitable area or points with high groundwater potential
- to avoid wastage of funds (reduced chances of sinking a dry borehole)
Environmental features considered during siting are:
(i) Rock type (geology)
(ii) Geological structures e.g. Fractures
(iii) Vegetation
(iv) Geomorphology
Limitation:
It does not measure the availability of groundwater (only measures the resistivity of earth materials)
A borehole is basically defined as “a hole bored or drilled in the earth especially to obtain water.”
Processes involved in Borehole construction:
(i) Boring on the earth
(ii) Installing casing pipes
(iii) Installing gravel pack material
(iv)Well development
(v) Grouting
(vi) Pumping test/airlift
(vii) Sealing the borehole
(viii) Water sampling and testing
(ix) Water pump equipping
Water testing focuses on analyzing:
(i) Physical parameters
(ii) Chemical parameters
(iii) Bacteriological parameters
