How Balochistan’s Karez Systems Work and What UNESCO Status Means
A source-checked guide to Balochistan’s gravity-fed karez tunnels, water shares, dated inventories, groundwater threats, rehabilitation evidence and UNESCO Tentative List status.
Balochistan’s karez systems are simultaneously hydraulic works, agricultural landscapes and social institutions. Water shares, cleaning duties, passage across land and conflict resolution can matter as much as masonry. Pakistan added the Karez System Cultural Landscape to its UNESCO World Heritage Tentative List on 12 April 2016. As checked on 5 September 2026, it remains a Tentative List entry, not a property inscribed on the World Heritage List.
The essential facts at a glance
| Question | Evidence-based answer |
|---|---|
| What moves the water? | Gravity along a slight downhill gradient, not a conveyance pump. |
| Where does the water come from? | A groundwater-bearing formation intercepted by the upper part of the gallery and mother well. |
| What are the vertical holes? | Construction and maintenance shafts along the buried route; they are hazardous openings, not a visitor trail. |
| Who manages a karez? | Arrangements vary, but documented systems connect water shares with maintenance labour and customary governance. |
| Is it UNESCO World Heritage? | No. The Balochistan serial proposal has been on Pakistan’s Tentative List since 2016. |
| How many still work? | No single live total is established by the cited sources. The often-repeated counts belong to dated, differently scoped datasets. |
| Why do systems fail? | Falling water tables, weak recharge, drought, nearby pumping, tunnel collapse, sediment, flood damage, land change and loss of maintenance can interact. |
The parts of a complete karez landscape
The upstream mother well reaches the aquifer. From that zone, a subhorizontal tunnel follows a carefully controlled downward slope. Intermediate shafts connect the tunnel to the surface. At the daylight point, the gallery emerges and water enters channels, storage or cultivated land. The command area, fields, orchards, paths and settlement complete the working landscape.
Descriptions that show only a row of circular shaft mounds miss most of the system. The aquifer and recharge area are upstream; the buried gallery links the shafts; the outlet makes use possible; and social rules distribute the flow. Conservation therefore cannot stop at repairing visible openings. It must understand the source area, full alignment, users and downstream land.
How the hydraulic gradient moves water
The gallery must slope enough for water to move toward the outlet but not so steeply that flow erodes the tunnel. Its upper section intersects shallow groundwater, while the lower section conveys the collected flow. Experienced builders establish levels and excavate between shafts, removing spoil vertically. The line of mounds visible from above records that construction process.
Published modelling of karezes in the wider Afghanistan–Pakistan region shows that output is sensitive to aquifer conductivity, the gallery’s contact with the water table, length and gradient. Those findings explain the mechanism, but they are not a current flow measurement for any named Balochistan karez. Site claims need site-specific hydrogeology and dated measurements.
Gravity-fed does not mean water without limits
A karez normally needs no pump to convey water from the gallery to its outlet. This lowers operating energy compared with mechanically lifting the same groundwater. The underground route can also reduce direct evaporation relative to a fully exposed canal. Neither advantage makes the supply inexhaustible or automatically sustainable under every pattern of abstraction.
If nearby pumping lowers the water table below the collecting gallery, flow declines or stops. Reduced recharge can produce the same outcome. A system may also lose water through cracks, sediment, collapse or an unmaintained surface channel. “Ancient zero-energy technology” is therefore an incomplete description: the karez is physically coupled to a shared aquifer and socially coupled to labour.
The shafts are for access and maintenance
Vertical shafts let excavators reach the alignment, remove soil, ventilate the work and later clear sediment or repair collapses. Their spacing and depth vary with terrain and construction. A shaft visible at ground level does not by itself show whether the gallery currently carries water, is blocked, has collapsed or has been abandoned.
Open shafts can be fatal fall and confined-space hazards. An online map or heritage article should not encourage entry or publish precise access details without community consent and safety control. Researchers should inspect with trained local managers, record covers and damage, and avoid treating a working water system as an unsupervised tourist tunnel.
Water begins at the daylight point for users
The daylight point is where the underground gallery reaches the surface. From there, channels distribute flow to homes, livestock, gardens or fields according to local arrangements. Water can be divided by time rather than by a permanently fixed channel volume because discharge changes.
The outlet is not the whole asset. Blocking a recharge zone, cutting an upstream gallery or building over a shaft can damage a system whose visible outlet lies far away. Conversely, lining only the downstream channel cannot restore flow if the water table no longer intersects the collection gallery.
Water shares turn infrastructure into an institution
Pakistan’s UNESCO Tentative List submission describes community shares in terms of shabanas, or 24-hour cycles, and identifies shareholders as shareeq. The submission gives a range of 18 to 32 shabanas for a karez and claims that individual rights may range from minutes to a week. These details describe the nomination’s evidence; they should not be converted into a universal rule for every system in the province.
The World Bank case study also records regional variation. In the Mekran coastal area it describes passage across land as common-property practice without compensation, while arrangements elsewhere may differ. A serious field record should ask who owns shares, who uses the water, how turns are timed, who supplies cleaning labour, how costs are allocated and which body resolves disputes.
Maintenance is a recurring collective obligation
Sediment must be removed, damaged sections supported, shafts made safe and surface channels kept open. A repair that restores the tunnel but excludes users from decision-making can weaken the institution needed for the next maintenance cycle. Equally, documenting customary rules without inspecting the hydraulic structure cannot show whether water can flow.
The social-capital literature on Balochistan treats the shift from karez to private tubewells as more than a change of machinery. Field studies report effects on equity, livelihoods and community cohesion because pumped access can move control from a shared schedule toward owners with capital and energy. The magnitude and direction of those effects must be established locally rather than assumed for every village.
What Pakistan placed on UNESCO’s Tentative List
The official entry is titled “Karez System Cultural Landscape,” submitted by Pakistan’s Directorate General of Archaeology on 12 April 2016 under proposed criteria ii, iv and v. The current page identifies four representative components: Spin Tangi Kareze in Quetta District, Chashma Achozai Kareze in Quetta District, Ulasi Kareze in Pishin District and Kandeel Kareze at Muslim Bagh in Killa Saifullah District.
UNESCO displays Tentative List material for transparency and states that responsibility for its description lies with the submitting state. That disclaimer matters. The page is primary evidence of what Pakistan proposed and of its formal status; it is not an independent validation of every historical, engineering or current-operational claim in the nomination text.
Tentative List status is not World Heritage inscription
A state party ordinarily uses its Tentative List to identify properties it may later nominate. A completed nomination, advisory-body evaluation and World Heritage Committee decision are separate stages. No such inscription is shown for the Balochistan karez proposal. Headlines and captions should say “on Pakistan’s UNESCO World Heritage Tentative List,” not “a UNESCO World Heritage Site.”
PCRWR’s 2023–24 annual report records work involving a nomination steering committee and a governance framework. That is evidence of a continuing preparation process at that time, not proof of inscription. Status should always be checked again on UNESCO’s live list rather than copied from an old project report.
The four proposed components are not the whole inventory
The serial proposal uses four systems to represent a much larger tradition. That does not mean only four karezes exist, nor does inclusion in the proposal establish the current condition of every shaft and channel at those locations. Boundaries, buffer zones, attributes, user communities and current integrity would require precise nomination and management documentation.
It is also unsafe to transfer UNESCO claims about one component to an unnamed karez elsewhere. A photograph caption should identify its verified location, date and status. If the system is outside the four named components, call it part of Balochistan’s wider karez heritage rather than part of the proposed serial property.
Why the 1,053 figure needs a 2012 label
The Tentative List submission states that approximately 1,053 karezes were functioning in Balochistan, with more than 22,000 litres per second of discharge and about 27,000 hectares irrigated in 2012. It also mentions another 270 non-functioning systems considered potentially restorable. These are nomination figures tied to 2012, not a 2026 operating census.
The labels also require definitions. “Functioning,” “non-functioning” and “restorable” can depend on minimum flow, physical condition, season and assessment method. Repeating the numbers without the year makes an old baseline look live. Converting “potentially restorable” into “will be restored” changes an assessment into a promise.
Why PCRWR’s 1,200 survey is a different dataset
PCRWR’s Quetta research centre says it surveyed about 1,200 karezes in northern Balochistan and developed a digital inventory using multiple technical parameters. Its 2023 institutional profile similarly describes inventory work. This is a survey count, not necessarily a count of functioning systems, and its stated geography is northern Balochistan rather than an automatically province-wide universe.
The UNESCO and PCRWR totals need not match. They can differ by date, boundary, deduplication, definition, seasonal observation and whether dry or damaged systems were included. A responsible comparison needs the underlying inventory schema and observation dates. Subtracting 1,053 from 1,200 does not reveal how many systems failed or recovered.
What the evidence says about tubewells
The World Bank case study reports rapid growth in tubewells from the 1970s and accelerated groundwater decline, with some basins reported to be falling by more than five metres per year in the period summarized. A peer-reviewed World Development study examined the transition from karez irrigation to electric tubewells and linked it to groundwater pressure and erosion of karez-centred social capital.
Those studies support the mechanism: concentrated pumping can lower a shared water table below a passive gallery. They do not prove that a particular dry karez failed solely because of the nearest visible well. Establishing causation requires pumping records, well depths, groundwater time series, recharge information and the condition of the gallery itself.
Drought and recharge need dated evidence
Balochistan is arid to semi-arid and rainfall is uneven. FAO’s water-management review describes groundwater mining, falling levels in many areas and karez flows affected by overexploitation. The World Bank note adds recurring drought and reduced recharge to a combination of pressures. These sources are important historical and policy evidence, but neither is a live 2026 hydrological dashboard.
To attribute current decline to climate, use a defined basin, a stated period, precipitation or snow data where relevant, groundwater levels and abstraction estimates. A single dry shaft photograph cannot separate drought, pumping, collapse and seasonal variation. “Climate change destroyed the karez” is too strong without a causal study for that system.
Flood resistance should not become a blanket claim
The Tentative List submission presents underground construction as relatively resistant to hazards, including floods. Yet maintenance literature and local evidence also recognize that floods can damage openings and surface channels or deposit sediment in galleries. Both points can be true: buried conveyance may be less exposed than an open canal, while individual shafts, outlets and channels remain vulnerable.
Condition surveys should record recent flood paths, collapsed sections, sediment depth, erosion around shafts and changes at the daylight point. Heritage promotion should not promise disaster-proof infrastructure. Resilience is a comparative, site-dependent property, not immunity.
Karez water is not automatically safe to drink
Groundwater origin and an underground route do not guarantee potable quality. Contamination can enter through damaged or uncovered shafts, surface runoff, animals, waste disposal, geology or downstream handling. Historic irrigation-quality observations cannot be generalized to every source or to human consumption decades later.
A current water-quality claim needs a dated sample, sampling point, accredited method and comparison with the applicable standard. Irrigation suitability is not the same as drinking-water safety. Restoration plans should separate hydraulic flow, chemical and microbiological quality, and intended use.
What the 1978 groundwater ordinance can and cannot prove
The World Bank case study discusses Balochistan’s Ground Water Rights Administration Ordinance of 1978 and the intended regulation of wells near karezes and designated groundwater basins. It also reports serious implementation limitations. Citing the ordinance therefore shows a history of legal recognition; it does not prove that protection distances are uniformly enforced today.
Any current legal or permitting claim should be checked against the operative provincial law, rules, notifications and responsible authority. Customary spacing practices reported in a case study should not be presented as a universally enforced modern limit. Legal protection on paper, licensing practice and actual abstraction are distinct evidence layers.
What the Nau Sanjidi pilot actually demonstrated
The World Bank’s rehabilitation note describes work at Sanjidi and Nau Sanjidi near Quetta. It reports that discharge measured at the end of Nau Sanjidi increased from 2.7 litres per second in 2016 to 3.1 litres per second in 2017 despite low rainfall. The project used baseline work and community consultation alongside physical rehabilitation.
This is useful site evidence, not proof that cleaning every karez will yield the same percentage increase. Starting condition, recharge, nearby pumping, tunnel geometry and measurement season differ. A before-and-after result from one site should be retained with its dates and units, then tested over a longer period rather than promoted as a province-wide forecast.
Rehabilitation must join engineering and governance
A technically credible plan maps the mother well, gallery, shafts, daylight point, channels, recharge area and command area. It measures flow and quality, inspects structural condition, records nearby abstraction and prioritizes dangerous collapses. Work should avoid changing the gradient or sealing paths in ways that reduce recharge or damage historic fabric.
A socially credible plan identifies shareholders, users without formal shares, maintenance labour, downstream farmers, women’s and household uses where relevant, land access and dispute procedures. It defines who will maintain the repair and how future costs are shared. Restoring flow without resolving contested allocation can move conflict downstream.
A minimum evidence record for every system
| Evidence group | Minimum fields |
|---|---|
| Identity | Local names, verified coordinates, district, settlement and survey date. |
| Hydraulics | Mother-well depth, gallery length and gradient where safe, flow with date and season, water level and quality. |
| Condition | Active, intermittent, dry, blocked, collapsed or abandoned under explicit definitions. |
| Landscape | Recharge area, shaft line, outlet, channel, command area, land use and nearby wells. |
| Governance | Shares, distribution cycle, maintainers, costs, access, consent and dispute authority. |
| Heritage | Materials, repairs, oral history, archives, boundaries, threats and significance. |
| Public safety | Open shafts, unstable ground, water-use warnings and limits on sensitive location data. |
Without these fields, a database may count features but still fail to support management. The record should preserve previous observations rather than overwrite them, so users can distinguish seasonal change from long-term decline and new repair from historic construction.
How to verify a claim about a named karez
- Identify the exact local name, district, coordinates and date of observation.
- Ask whether the claim concerns a shaft, a complete system, the proposed UNESCO component or the wider landscape.
- Find the primary inventory record and its definition of operational status.
- Check flow, water level and quality measurements with units, season and sampling point.
- Interview authorized community managers about shares, maintenance and recent changes.
- Compare nearby pumping, recharge and structural evidence before assigning a cause.
- State uncertainty and never turn a dated count into a current province-wide total.
How the Balochistan case fits the wider qanat tradition
Related systems are called qanat, kariz, foggara, khettara and other regional names across a broad arid-zone geography. Comparative scholarship helps explain the hydraulic principle and long-distance transfer of knowledge, but it should not erase Balochistan’s own terminology, land relations and maintenance institutions.
The Persian Qanat is a separate UNESCO-inscribed serial property in Iran. Its inscription does not grant World Heritage status to Balochistan’s systems. It can, however, offer comparative lessons about documenting recharge areas, dependent structures, traditional councils, risk preparedness and the link between material fabric and living management.
Common misconceptions
- “The shafts are a chain of wells.” They mainly provide access to one connected gallery; the system is not simply independent wells.
- “No pump means unlimited sustainable water.” Flow still depends on aquifer level, recharge and competing abstraction.
- “UNESCO recognized all Balochistan karezes as World Heritage.” Pakistan submitted a four-component Tentative List proposal in 2016.
- “There are exactly 1,053 working systems today.” That figure in the nomination is explicitly associated with 2012.
- “PCRWR’s 1,200 means 147 new systems appeared.” The datasets have different scope and definitions, so subtraction is invalid.
- “One repair result proves every system can be revived.” Rehabilitation depends on hydrology, structure, governance and continuing maintenance.
- “Clear flowing groundwater is safe to drink.” Potability requires current, appropriate testing.
Related Balochistan guides
Use the Balochistan province guide for geographic scale and administrative context. The Quetta guide supplies urban and highland context, while the Hanna Lake evidence guide treats a different catchment-dependent water body. The Reko Diq project guide separates modern industrial water questions from community irrigation rather than treating every provincial water demand as the same system.
Sources
- UNESCO World Heritage Centre — Karez System Cultural Landscape — Used for the 12 April 2016 Tentative List status, submitting authority, four representative components, state-party description, 2012 figures, proposed criteria and UNESCO disclaimer.
- Pakistan Council of Research in Water Resources — WRRC Quetta — Used for PCRWR’s statement that about 1,200 karezes in northern Balochistan were surveyed through multiple technical parameters and placed in a digital inventory.
- PCRWR — Annual Report 2023–24 — Used as dated evidence of nomination steering-committee and governance-framework activity, not as evidence that UNESCO inscription was completed.
- World Bank — Groundwater Management in Balochistan — Used for the karez rehabilitation case, groundwater and tubewell context, regional variation in water rights, the 1978 ordinance discussion and dated Nau Sanjidi flow measurements.
- World Bank South Asia Water Initiative — Groundwater resources — Used to verify the institutional programme and publication context of the Balochistan rehabilitation note rather than treating a repost as an undated local claim.
- FAO — Water Management in Baluchistan — Used for aridity, uneven rainfall, historical groundwater monitoring, karez-flow decline, tubewell expansion and the distinction between groundwater development and recharge management.
- World Development — Transition from Karez to Tubewell Irrigation — Used for the peer-reviewed analysis of groundwater pressure and changes to karez-centred social capital; its 2007 publication date limits its use for present totals.
- Contemporary South Asia — Karez versus tubewell irrigation — Used for field-study evidence on social equity, livelihoods, community cohesion and environmental effects of the technology transition, not for universal claims about every community.
- Applied Water Science — Viability of karezes in a changing world — Used for the regional hydraulic model and sensitivity of flow to aquifer properties, gradient, gallery contact and recharge, while keeping its Afghanistan-focused evidence separate from Balochistan site measurements.
- University of Balochistan — Drought vulnerability and socioeconomic impacts — Used for a dated district-level account of drought effects on karez and spring use; it is not treated as a province-wide current census.
- UNESCO World Heritage Centre — The Persian Qanat — Used only for comparative evidence on qanat anatomy, recharge-area protection, dependent structures and living communal management in a separately inscribed Iranian property.
