The borehole drilling process

Explore Powerwell's sixteen-stage borehole drilling process and completed water infrastructure projects across Kenya.

A structured sixteen-stage journey from site assessment to a fully commissioned, solar-ready water supply — delivered with transparency at every step.

From survey to commissioning

Drilling a borehole is one of the most dependable ways to secure long-term water for a home, farm, or business — but outcomes depend on disciplined process, not shortcuts. Every Powerwell project follows the same sixteen stages, each building on the last, so you know exactly what happens, why it matters, and what to expect when you work with us.

Project case studies

Sixteen stages of delivery

01. Hydro-geological Survey

Site assessment using geophysical methods to locate aquifers and recommend the best drilling point before any ground is broken.

Every successful borehole starts with understanding what lies beneath the surface. Our hydrogeologists conduct electrical resistivity and related geophysical surveys to map subsurface soil and rock layers and identify formations that can store and transmit groundwater. The survey also reveals fractures, fault lines, and weathered zones that often yield strong water flows. You receive a technical report with the recommended drilling location, expected depth, and estimated yield. Skipping this step is one of the most common reasons boreholes fail or cost far more than planned — a proper survey protects your investment from day one.

02. WRA Permit

Powerwell prepares and submits your WRA permit application so drilling is legally authorized before work begins.

Powerwell prepares and submits a Water Resources Authority (WRA) permit application on your behalf once the hydro-geological survey confirms a viable site. The application includes the hydro-geological report, GPS coordinates, and your intended use — domestic, agricultural, commercial, or industrial. Groundwater in Kenya is a regulated resource, and the WRA reviews each submission to ensure abstraction will not harm the local water table or neighbouring users. Processing times vary, so we build this stage into the project schedule from the outset. Drilling without a valid permit is illegal and can lead to fines or the borehole being capped — we handle this process formally and transparently on every project.

03. Drilling

Mobilisation of the rig and penetration to the target aquifer using rotary, percussion, or combined methods matched to site geology.

With permits secured, our drilling crew mobilises to site and begins penetrating the ground toward the aquifer identified in the survey. Depending on geology, we use rotary drilling with fluid or air circulation, percussion methods, or a combination suited to the formation. The crew monitors cuttings and penetration rates in real time to confirm conditions match survey predictions. Drilling continues until a productive water-bearing zone is reached — from under fifty metres to several hundred metres depending on region and aquifer characteristics.

04. Logging

Detailed recording of geology, water strikes, and formation changes at every depth interval throughout the borehole.

As the hole deepens, geological logging documents exactly what is encountered at each interval — soil type, rock type, water strikes, and formation changes. Cuttings from the drill are examined continuously, and borehole logging tools may measure resistivity and conductivity at different depths. The result is a vertical profile showing where water-bearing zones occur and how productive each appears to be. This log drives every subsequent decision: casing design, screen placement, and final depth. It also becomes a permanent technical record for future maintenance or upgrades.

05. Casing

Installation of uPVC or steel casing and well screens to stabilise the hole and protect water quality.

Once target depth and water zones are confirmed, casing lines the borehole to prevent wall collapse and block contaminated or unwanted water from entering the supply. Solid casing seals off non-productive sections; slotted well screen allows groundwater in while keeping sediment out. Screen placement is guided directly by the geological log so openings sit exactly where aquifers occur. Proper casing protects borehole longevity and water quality — poorly cased wells can allow surface contamination to seep into the supply.

06. Gravel Packing

Graded gravel filter installed around screened sections to protect the pump and maintain long-term yield.

In sandy or loosely consolidated formations, graded gravel is poured into the space between the borehole wall and the casing at screened depths. The gravel pack filters water into the borehole while blocking fine sand and silt that could clog the screen or damage the pump. Gravel size is selected based on aquifer grain size from logging — too coarse lets sediment through; too fine restricts flow. A correctly installed gravel pack significantly extends the life of both the borehole and the pump.

07. Development

Clearing drilling residue and fine sediment so the borehole delivers clean water at its full natural capacity.

Development removes drilling fluids, fine sediment, and disturbed material left from drilling, casing, and gravel packing. Surge blocking, air-lifting, or controlled over-pumping agitate and flush the well until water runs consistently clear and yield stabilises. Without proper development, a borehole may produce cloudy water indefinitely, deliver reduced yield, and place unnecessary wear on the pump. This stage is as much about long-term performance as it is about clarity on day one.

08. Pumping Test

Controlled extraction and drawdown monitoring to establish the borehole's safe, sustainable yield.

Before selecting a permanent pump, water is pumped at controlled rates while the water level inside the borehole is monitored for drawdown and recovery. This data lets our engineers calculate the safe sustainable yield — the maximum long-term extraction rate without depleting the aquifer or damaging the borehole. Results directly inform pump selection and operating parameters. Pumps chosen without test data are a frequent cause of premature failure and disappointing performance.

09. Water Analysis

Laboratory testing of physical, chemical, and microbiological quality to confirm fitness for intended use.

A water sample is sent for laboratory analysis covering pH, total dissolved solids, hardness, iron, fluoride, bacteria such as E. coli, and other parameters relevant to your intended use. Results show whether water is safe to drink as-is, needs treatment, or suits agricultural or industrial use without further processing. Many contaminants are invisible and tasteless — analysis protects everyone who will rely on the supply, even when water looks and tastes fine.

10. Borehole Completion

Secure wellhead, sanitary seal, and official registration transforming the hole into a finished, protected structure.

Completion finishes the physical well: secure capping, sanitary surface seal against runoff infiltration, and where required a concrete apron or headworks for protection and access. The borehole is registered with final specifications — depth, casing, yield — for official records. A completion certificate or technical summary is issued documenting everything achieved. The borehole is now a secure, contamination-resistant structure ready for equipping.

11. Pump Selection

Data-driven sizing of the submersible pump based on yield, drawdown, head, and daily demand.

With yield, drawdown, and water quality confirmed, the correct pump is selected using static water level, sustainable yield, total dynamic head, and your daily demand — household, livestock, irrigation, or commercial. Submersible pumps are typical for boreholes, but model, horsepower, and stage configuration vary widely. Matching a neighbour's pump without data is a costly mistake — nearby boreholes can differ dramatically. Correct selection is what keeps the system efficient for years rather than failing early.

12. Equipping

Physical installation of pump, pipework, cabling, controls, and protection systems into the completed borehole.

The selected pump and components are installed: submersible unit at the correct depth on rising main, waterproof power cable, non-return valve, and a sealed pump head assembly. Control equipment — pressure switch, float switch, control box — is wired along with surge and lightning protection where required. Careful equipping ensures watertight connections, correct depth, and protection against dry-running and electrical surges.

13. Tank Installation

Storage tank and controls providing on-demand water buffered from the borehole supply.

A storage tank holds water pumped from the borehole so supply is available on demand, not only while the pump runs. Capacity depends on daily needs, yield, and whether the system serves a home, farm, or commercial operation. Tanks are often elevated for gravity pressure and fitted with float switches to stop the pump when full. Proper tank installation turns a working borehole into a convenient, reliable water supply.

14. Solar System Design

Custom solar array and controller specification sized to the pump and site irradiance.

For solar-powered systems, we design panel capacity around the pump's power rating, required daily run-time, site solar irradiance, and shading. The design specifies panels, mounting, and solar-compatible pump controllers or inverters; battery storage is included only where needed. The design balances borehole yield, pump characteristics, and realistic sunlight hours so daily demand is met without over- or under-specifying the array.

15. Solarization

Installation and configuration of panels, mounting, wiring, and controllers to power the pump from the sun.

Solarization implements the design: panels and frames mounted at optimal angle and orientation, solar controller configured for the pump's electrical requirements, and all wiring connected and tested. The controller manages variable panel output and provides dry-run and overload protection. A correctly solarized system runs with minimal electricity cost and keeps operating where grid power is unreliable or unavailable.

16. Commissioning

Full-system testing, client handover, and operational briefing marking official project completion.

Commissioning tests the entire integrated system — borehole, pump, electrical or solar components, pipework, and tank — as one unit. We run full operating cycles, verify controls and safety devices, confirm flow and pressure, and correct any faults before sign-off. You receive a walkthrough of operation, basic maintenance, and support contacts. Commissioning is when you take over a fully functional, tested water supply built to last.

Project gallery

Groundworks — Site preparation and civil support works around the borehole pad.
Site assessment — Pre-drilling site review and access preparation before rig arrival.
Drilling operations — Deep borehole drilling with professional plant and safety protocols.
Elevated storage — Steel tank tower installation for gravity-fed distribution.
Tank systems — Dual elevated tanks delivering reliable storage and pressure.
Distribution setup — Pipework and distribution connections from borehole to point of use.
Completed project — Commissioned water supply ready for domestic and commercial use.
Commissioning visit — Final checks and client handover on a completed borehole system.

Field video stories

Solar array on a live borehole site — On-site footage of a solar installation supporting a Powerwell borehole system — showing how we pair renewable power with reliable groundwater delivery for homes, farms, and institutions.
Preparing the pad and access — Groundworks and site preparation before drilling begins. Clean access, a level pad, and safe working space are the foundation of every successful borehole project.
Rig arrival and setup — Field clip of rig mobilisation — positioning plant, verifying clearances, and setting up for controlled drilling under Powerwell site protocols.
Active borehole drilling — Live drilling operations capturing the pace and discipline of a Powerwell crew at work — forming the borehole that will later be cased, tested, and equipped.
Casing and borehole protection — Footage focused on casing and borehole protection — the stage that guards water quality, structural integrity, and long-term yield after drilling is complete.
Pump and pipework installation — Equipping in progress: pump, rising main, and associated pipework being installed so the borehole can deliver water reliably to storage and points of use.
Elevated storage and tanks — Site video of elevated tank and storage works — giving clients consistent pressure, reserve capacity, and a cleaner handover from borehole to distribution.
Final checks and client handover — Commissioning and handover footage — confirming the system runs as designed, walking through operation, and leaving the client with a complete, working water supply.

Why the sequence matters

A pump sized without pumping test data, casing designed without a geological log, or solar panels specified without knowing the pump's true demand all produce the same result: a borehole that disappoints. Powerwell follows this sequence on every project because it is the difference between a hole that simply contains water and a complete, reliable water supply system built to last.

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