Author Archives: Raeli Hydro

Borehole success rates in Turkana County vary widely depending on how and where the bores are drilled, but available assessments suggest that without proper hydro‑geophysical surveys, roughly one‑third of bores fail (dry or low‑yield), while well‑planned projects can reach 70–90% success.

What “success rate” means in Turkana

In Turkana, a “successful” borehole is usually one that:

• Finds water at a usable yield.

• Is drilled in a stable aquifer that does not dry up quickly each dry season.

Reports from NGOs and water‑resource studies note that before systematic surveys and modern logging, as few as half of the thousands of boreholes drilled in Turkana were functional, because many were placed in unsuitable zones or in shallow, highly saline layers.

Reported success‑rate ranges

• Unplanned / haphazard drilling
  Surveys of groundwater‑development practice in Turkana state that about two in three boreholes drilled without proper geophysical information turn out dry or under‑performing, implying a success rate around 30–40% when no pre‑drilling survey is done.

• With geophysical surveys and professional siting
  Where organisations use resistivity or VES‑based targeting, success rates are much higher. For example, Oxfam and similar partners report 70–80% successful bores in their focused Turkana projects.
  Some experienced drilling contractors working in Turkana, such as Raeli Hydro, quote internal success rates of about 90–98% when they control the survey and siting, although this reflects their own high‑standard practice rather than a county‑wide average.

Why the rate is not uniformly high

Several factors keep the overall success rate lower across the whole county:

• Drilling without surveys: Many bores are still sunk by small contractors or communities relying on “experience” rather than resistivity/VES, which increases dry‑hole risk.

• Over‑abstraction in hotspots: In areas with heavy groundwater use (e.g., oil‑field‑related abstraction in Lokichar basin), water levels drop, so some previously productive bores decline or fail.

• Mechanical and maintenance failures: Even successful bores often become non‑functional later due to pump failures, poor casing, or lack of maintenance, which distorts the long‑term “success” picture.

Practical takeaway for planning

If you are planning a borehole in Turkana:

• Treat 30–40% as a realistic worst‑case success rate if you skip a geophysical survey.

• Aim for 70–90% by working with a contractor who uses resistivity/VES and who has a documented track record in Turkana.

In short, the average borehole success rate in Turkana is roughly 30–40% when drilling is done without proper surveys, but can rise to 70–90% or higher when professional hydro‑geophysical siting is applied.

Borehole drilling in Turkana County is typically more expensive than in many other parts of Kenya because of a combination of logistical, geological, and operational factors that push the per‑metre rate higher.

Long distance and poor access

One of the biggest reasons drilling costs more in Turkana is distance and rough terrain. Many sites are far from major towns, with poor or unpaved roads, so rigs, fuel, and materials must cover long distances over difficult ground. This dramatically increases:

• Mobilisation and transport fees to move heavy drilling rigs and casing.

• Fuel and standby time because rigs move slowly and may need to wait for road conditions or security approval.

Several drilling‑cost tables for Kenya list Turkana with a per‑metre drilling range of about KSh 8,000–9,500, higher than softer‑soil counties like Machakos or Kitui, where the rate is closer to KSh 6,500–7,000 per metre.

Hard and deep‑rock geology

Turkana’s subsurface often includes hard rock, fractured formations, and deep aquifers, which slow down drilling and wear out equipment faster. In these conditions:

• Rigs must work longer hours to reach water, increasing labour and fuel costs.

• Drilling rigs and drill bits experience more wear, so contractors factor in higher per‑metre rates to cover repairs and replacements.

When the water table is deep (often 100–200 m or more), the bore must be drilled, cased, and tested over a much greater length, pushing the total project bill well above projects in shallow‑aquifer regions.

Remote‑site operational overhead

Drilling in remote Turkana locations introduces extra “hidden” costs that are smaller in urban counties:

• Crew and equipment standby charges while waiting for approvals, visas for security‑sensitive areas, or favourable weather.

• Local security and permits, especially near borders or oil‑exploration zones, which can delay schedules and add to daily costs.

• Logistics for water, power, and camping for the drilling team, since basic services are limited.

Many contractors treat these as part of the per‑metre rate or mobilisation fee, rather than listing them separately, so the headline price per metre already reflects the remote‑site premium.

Market‑driven per‑metre rates in Turkana

Price‑guides for Kenyan boreholes consistently show that Turkana sits at the upper end of the drilling‑cost spectrum:

This means that for the same depth, a borehole in Turkana will usually cost more than an equivalent bore elsewhere, even before adding pumps, tanks, and solar‑power systems.

How to manage costs in Turkana

Even though the baseline is higher, several steps can control the cost:

• Order a geophysical survey (e.g., resistivity) before drilling to avoid going much deeper than necessary.

• Request a detailed breakdown from at least two Turkana‑experienced contractors, including mobilisation, drilling, casing, and standby‑day charges.

• Plan for a complete system (pump, power, tank) in one budget so that “drilling only” quotes don’t later balloon when other components are added.

In short, borehole drilling in Turkana becomes more expensive mainly because of long‑haul logistics, hard/difficult rock, deeper aquifers, and higher standby/remote‑site overheads, which together justify the KSh 8,000–9,500 per‑metre band seen in market‑price tables.

PVC and steel casing are the two main options for boreholes in Kenya, and their costs differ significantly even though both serve the same core purpose: to prevent borehole collapse and contamination. In general, PVC casing is roughly 40–60% cheaper than steel casing per metre, but the right choice depends on geology, depth, and long‑term durability needs.

Per‑metre cost comparison

Recent market data and contractor quotes for Kenya show the following typical price ranges:

For a 100‑metre borehole, that means PVC casing usually adds about KSh 120,000–250,000, while steel can easily reach KSh 250,000–350,000 just for the casing material, before drilling, pumping, and tanking. This “PVC savings zone” is why many contractors quote PVC as the default choice for residential and low‑to‑medium‑depth projects.

Hidden cost differences

Beyond the sticker price per metre, other factors affect the total cost:

• Transport and handling: PVC is lighter and easier to move, reducing transport and labour charges, especially on rough or remote sites.

• Installation speed: PVC sections are simpler to push/assemble, cutting rig‑time and standby fees.

• Durability vs. corrosion: Steel provides superior strength in collapsing soils and high‑pressure zones, but it can rust over time if not properly protected; PVC is immune to corrosion but may creep or deform under extreme wall‑pressure.

Some contractors even recommend steel casing only for the unstable upper section (e.g., top 20–50 m in loose or collapsing soils) and PVC below, which can cut cost while still protecting the bore.

When to choose PVC vs steel

Here is a practical guideline used by Kenyan drilling firms:

Many drilling education pieces in Kenya note that about 70–80% of successful residential bores use PVC, precisely because it is cheaper and sufficient for most common geological conditions.

How to decide for your project

To get the best cost‑effective choice between PVC and steel casing in Kenya:

• Get a geological report or resistivity survey to know if you are in collapsing soils or deep‑rock zones.

• Ask for a breakdown of “PVC only”, “steel only”, and “steel upper section + PVC main column” in your quote so you see the real cost difference.

• Don’t automatically pick steel “just in case”; in many stable sites, PVC is engineering‑sound and far cheaper, while steel is only justified where the ground really demands it.

In short, PVC casing runs about KSh 1,200–2,500 per metre and steel about KSh 2,500–3,500 per metre in Kenya, so PVC is typically the more economical choice unless the geology or depth strongly favours steel.

Boreholes in Turkana County typically range from shallow to deep, depending on whether they target alluvial/lagga aquifers or deeper regional formations.

Typical depth range in Turkana

Studies and project reports show that borehole depths in Turkana vary roughly between 20 m and 200 m, with many community and household bores falling inside that band. Boreholes closer to seasonal rivers (lagga) and Lake Turkana are often shallower, sometimes under 50 m, while those further from known surface‑water features may need to be drilled to 100–200 m or more to reach stable, lower‑salinity aquifers.

Depth by location type

County‑level water‑resources assessments also note that some planned schemes target medium‑depth aquifers (35–80 m below ground level), especially where preliminary investigation data are available, and only deeper drilling (100+ m) is recommended where the shallow zone is saline or unreliable.

What “average” depth to plan for

If you are planning a borehole project in Turkana County, planners and drilling contractors often use an effective planning depth of about 100–150 m as a practical working average, assuming:

• You are not immediately on a known lagga or river‑alluvium belt.

• You want to tap reasonably stable groundwater with lower risk of drying in dry seasons.

• You accept higher cost and longer drilling time to secure a higher‑yield, longer‑life bore.

For a more precise figure, many water‑supply projects in Turkana design bores in the 120–180 m range when targeting deeper aquifers that can support schools, health centres, or small‑town reticulation.

Why depth varies so much

Several factors create this wide spread in required borehole depth:

• Distance from lagga or Lake Turkana: closer sites often produce shallow bores; inland sites need more depth.

• Groundwater quality: shallow aquifers near dry riverbeds can be saline or brackish, forcing deeper drilling for fresher water.

• Aquifer type: alluvial sands and gravels near lagga are shallow, whereas deeper sedimentary or fractured‑rock aquifers may need 100–200 m.

In practice, if you are developing land at some distance from rivers or lakes in Turkana County, it is reasonable to budget for a 100–150 m borehole as a working average, while still commissioning a pre‑drilling resistivity survey to confirm whether 80 m or 180 m is more appropriate for your specific site.

The cost of drilling a borehole in Turkana County is generally higher than in many other parts of Kenya, mainly due to remoteness, difficult terrain, and longer logistics for rigs and casing materials.

Typical per‑meter cost in Turkana

Most reputable drilling contractors quote between KSh 8,000 and KSh 9,500 per metre for borehole drilling in Turkana County, depending on the method used and local ground conditions. This range is above the national average, which normally sits roughly between KSh 6,000 and KSh 9,500 per metre, because getting rigs, fuel, and steel/PVC casing to Turkana hikes transport and mobilisation surcharges.

Cost breakdown (per metre approx.)

These figures are contractor‑specific and can shift with fuel prices, security requirements, and the exact distance from the nearest major town (e.g., Lodwar vs. more remote sub‑counties).

Estimated total project costs

Because Turkana often requires deeper boreholes to reach reliable aquifers, the total drilled‑and‑equipped borehole can quickly reach five‑ or even six‑figure amounts. Typical ranges reported for similar ASAL projects are:

• Basic borehole (50–100 m): around KSh 500,000–900,000 for drilling, casing, and basic development.

• Deep borehole for community/irrigation (100–250 m+): often KSh 1,000,000–2,000,000+, once pumping, solar or diesel power, and storage are included.

For Turkana specifically, independent project quotes shared by drilling firms serving the county show full‑scope borehole projects (drilling, lining, pump, and simple distribution) sometimes approaching KSh 2,000,000 or more for deep, high‑yield community schemes.

What makes costs higher in Turkana

Several factors push the cost of drilling a borehole in Turkana County above rates in more accessible regions:

• Remote access and fuel costs: Longer hauls for rigs and consumables mean higher mobilisation and standby charges.

• Hard and fractured rock: Deeper, harder formations increase drilling time and wear on bits, raising the per‑metre rate.

• Casing and materials quality: Many contractors use thicker steel or high‑grade PVC to cope with salinity and long‑term yield, adding to the meter cost.

• Security and time delays: Some areas require special security arrangements or longer approvals, indirectly increasing labour and equipment‑hire days.

Practical tips to manage borehole cost in Turkana

• Do a hydro‑geophysical survey first (e.g., VES or resistivity) to avoid dry or shallow bores and reduce the risk of extra‑deep drilling.

• Get a site‑specific quotation from at least two experienced Turkana‑area contractors; ask for a breakdown of mobilisation, drilling, casing, and pump charges.

• Plan for a complete package: Include pump, power (solar or diesel), tank, and basic piping in your budget so that “drilling only” quotes don’t later surprise you.

In short, drilling a borehole in Turkana County typically costs between KSh 8,000 and KSh 9,500 per metre, with a full project often ranging from about KSh 500,000 for a shallow domestic bore to well over KSh 1,000,000 for a deep community or irrigation bore, depending on depth, yield, and equipment.