A borehole site assessment — also called a hydrogeological survey or borehole siting — is the process of evaluating a piece of land to determine whether it has viable groundwater, where the best drilling point is, and how deep you'll need to drill. In Ghana, it's the single most important step most people skip.
Why Borehole Siting Matters in Ghana
Ghana's geology is complex. The country sits on a mix of Birimian rocks, Voltaian sediments, and coastal sedimentary formations — each behaving very differently for groundwater. A site in Accra's coastal plains may hit water at 30 metres; a site on hard Birimian bedrock in the Ashanti region may need 65+ metres or yield nothing at all in the wrong spot.
Without a proper site assessment, drilling location is often chosen based on convenience (near the house, easy access for the rig) rather than hydrogeology. This is why Ghana has thousands of abandoned dry boreholes.
What Happens During a Borehole Site Assessment
A professional site assessment involves several distinct activities:
- Desk study & data reviewBefore visiting, we review national hydrogeological maps (CSIR-BRRI data), regional drilling records, satellite imagery, and any known aquifer data for your area.
- Site visit & geological mappingOur consultant visits your land and records surface geology — rock outcrops, soil type, topography, drainage patterns, and signs of shallow or deep water zones.
- Nearby borehole records analysisWe check the yield, depth, and water quality of boreholes drilled within 500m–2km of your site. This is some of the best predictive data available.
- Geophysical survey (if needed)For difficult sites, we use resistivity surveys to image the subsurface and identify zones of fractured rock where groundwater collects.
- Written report & recommendationYou receive a clear written report: recommended drill point (marked on your site plan), expected depth range, estimated yield, and any water quality concerns to watch for.
Types of Borehole Investigations in Ghana
Hydrogeological site assessment
The standard approach for domestic and commercial boreholes. Uses geological knowledge, local drilling records and a site visit to identify the best drill point. Suitable for most residential and small commercial projects.
Geophysical survey (resistivity)
Uses electrical resistivity to "see" underground. Identifies fractured zones, depth to bedrock, and water-bearing formations. Recommended for large projects, areas with complex geology, or sites where previous nearby boreholes have failed.
Geotechnical borehole investigation
Used primarily in construction to understand soil and rock properties for foundation design. Different from a water borehole assessment — though both involve drilling, the purpose is structural rather than water supply.
Borehole Water Detection Methods Used in Ghana
Professional borehole consultants in Ghana use a combination of methods to detect groundwater:
- Remote sensing & satellite data — identifies lineaments (fractures and faults) that often control groundwater flow
- Electrical resistivity tomography (ERT) — maps subsurface layers to find water-bearing formations
- Hydro-geological mapping — field mapping of rock types, joints, and structures that indicate groundwater
- Drilling records database — historical data from boreholes drilled in the area is often the most reliable predictor
What the Site Assessment Report Tells You
After an AquaProbe assessment, you receive a report that includes:
- Recommended drill location marked on a site plan
- Expected depth to reach the water table
- Predicted water yield (litres per hour)
- Recommended borehole diameter and casing depth
- Known water quality issues in your area (iron, salinity, bacteria risk)
- Our confidence level and risk rating for the site
How to Choose a Borehole Specialist in Ghana
When looking for a borehole specialist or borehole siting consultant in Ghana, check for:
- Membership or accreditation with the Ghana Institution of Geoscientists or Water Resources Commission
- Experience with local geology in your specific region
- Willingness to provide a written report (not just verbal advice)
- Independence from drilling contractors (to avoid conflicts of interest)
- References from previous clients
At AquaProbe, we are independent consultants — we do not drill boreholes. This means our recommendation is never influenced by the desire to drill a deeper (more profitable) hole.
Book a Site Assessment
Start with a free WhatsApp consultation. Tell us your location and we'll let you know what our assessment involves for your specific site.
WhatsApp Us NowFrequently Asked Questions
How much does a borehole site assessment cost in Ghana?
AquaProbe's site assessments start at GH₵800 for standard domestic plots in accessible areas of Greater Accra. Larger sites, remote locations, or projects requiring geophysical surveys cost GH₵1,200–GH₵1,500. Contact us for a quote specific to your location.
Can a borehole assessment guarantee water will be found?
No assessment can guarantee 100% success — groundwater is a natural resource and has some inherent unpredictability. However, a professional site assessment dramatically improves success rates. At AquaProbe, over 94% of boreholes drilled at our recommended points have yielded water within the predicted depth range.
How long does a borehole site assessment take?
The site visit typically takes 2–4 hours. The written report is delivered within 48 hours of the visit.
Do I need a site assessment if there are successful boreholes nearby?
Nearby successful boreholes are a positive sign, but they don't guarantee success at your specific spot. Groundwater can vary significantly over short distances — especially in fractured basement rock terrain. A brief assessment is still recommended to confirm the optimal drill point.