Mechanized Sand Mining in the Maha Oya, Sri Lanka

Maha Oya river is one of the main sources of sand for the increasing needs in construction materials by Sri Lanka. River sand mining has high environmental and social impacts. Local EJOs succeeded in forcing the government in regulating the activity.


Maha Oya is one of the largest rivers in Sri Lanka. More than 1.1 million people live in the area, harnessing myriad of benefits from the river that provides water for domestic and industrial needs and is at the basis of subsistence and livelihood activities of local communities. Hence, continuous river flow and good health of the riverine environment is of vital importance in terms of socio-economic and environmental aspects.

See more...
Basic Data
NameMechanized Sand Mining in the Maha Oya, Sri Lanka
CountrySri Lanka
ProvinceWestern Province
Accuracy of LocationMEDIUM regional level
Source of Conflict
Type of Conflict (1st level)Mineral Ores and Building Materials Extraction
Type of Conflict (2nd level)Building materials extraction (quarries, sand, gravel)
Specific CommoditiesSand, gravel
Project Details and Actors
Project DetailsThe annual sand requirement of the country is nearly 8.5 million cubes in year as recorded in 2010 with an increase of 5-10% per annum [1].

The coastal stretch from Negombo to Chilaw has been identified as the most eroded coastline in Sri Lanka by the Coastal Zone Management Plan in 2006, of which 80-85% of the degradation is attributed to exacerbate sand mining in the Maha Oya. At certain places such as Katuneriya and Lansiagama, the erosion rate is 12-15m/year [1].
Level of Investment (in USD)unknown
Type of PopulationRural
Start Date01/01/2004
End Date08/05/2015
Relevant government actorsCentral Environmental Authority (CEA)

Geological Survey and Mines Bureau (GSMB)

Relevant Divisional Secretariats
Environmental justice organisations and other supportersEnvironmental Foundation Limited

NetWwater (Network of Women Water Professionals)

SLWP (Sri Lanka Water Partnership)

The Conflict and the Mobilization
Intensity of Conflict (at highest level)MEDIUM (street protests, visible mobilization)
When did the mobilization beginIn REACTION to the implementation (during construction or operation)
Groups MobilizingArtisanal miners
Informal workers
International ejos
Local ejos
Social movements
Local scientists/professionals
Religious groups
Fisher people
Forms of MobilizationDevelopment of a network/collective action
Involvement of national and international NGOs
Lawsuits, court cases, judicial activism
Official complaint letters and petitions
Environmental ImpactsVisible: Loss of landscape/aesthetic degradation, Soil erosion
Potential: Biodiversity loss (wildlife, agro-diversity), Floods (river, coastal, mudflow), Large-scale disturbance of hydro and geological systems
OtherSea erosion is another significant secondary effect due to insufficient sediment flow through the rivers. In particular, concerns are raised about the increasing damage to drinking water sources, loss and damage to irrigation systems and agricultural lands and spread of vector borne diseases by providing the breeding grounds for mosquitoes [2].
Socio-economic ImpactsVisible: Loss of landscape/sense of place
Potential: Displacement, Lack of work security, labour absenteeism, firings, unemployment, Loss of livelihood, Land dispossession
OtherLowering of the water table causing problems in water accessibility

Salinity intrusion to the river and other fresh water systems due to lowered river bed and water table

Loss of biodiversity and associated impacts on tourism and recreational value of the river

Impacts on the livelihoods and subsistence of the communities [1].

Uncontrolled sand mining has caused destruction to the natural morphology of many rivers, which had instigated structural problems to structures across the rivers such as bridges, barrages and fresh water intakes [2].

Portable water supplies to heavily populate coastal belt including capital city Colombo is supplied by the water drawn from the main rivers. Locations of these intakes have been designed carefully after studying the profile of the river, low flow conditions and the change of tidal levels. When most of these intakes were located few decades back it was not anticipated the river beds would lower to the levels now prevail. With the current levels of river beds that had been unexpectedly lowered, sea water intrusion along the river has become a permanent threat to water quality and quantity. It has now become necessary to change the location of intake in some water supply schemes. Replacement of a water supply intake may cost SL Rs 20 million (for new facilities) while the original investment has now become defunct [2].
Project StatusStopped
Pathways for conflict outcome / responseEnvironmental improvements, rehabilitation/restoration of area
Court decision (victory for environmental justice)
New legislation
Development of AlternativesLocal EJOs ask the application of the local regulations by local authorities.

Communities defend artisan mining practices, which have much lower impacts.
Do you consider this as a success?Yes
Why? Explain briefly.Mechanized sand mining was prohibited under the National Environmental Act 47 1980 by Gazette notification No. 1454/4 – 17 July, 2006.

Areas such as 100m from the Jambugaswatte area and 2km of both sides of Kochchikade main bridge were declared environmentally sensitive areas of the river and were protected.

In 2015, the Geological Survey and Mines Bureau drafted the Management Plan for Maha Oya with the participation of wider stakeholders along the river. The ongoing Maha Oya River Management Plan is expected to regularise mining activities, restore degraded areas, monitor illegal mining and effluent discharges whilst harvesting river sand in a sustainable manner.
Sources and Materials

Mines and Minerals Act No.33 of 1992 as amended in 2009


[1] Report by: Environmental Foundation Ltd., MAHA OYA UNDER THREAT. 2016, Sri Lanka. (Accessed 14/08/2016)
[click to view]

[2] Report by: B. Kamaladasa, Issues and challenges in river management due to excessive sand

mining. Irrigation Department of Sri Lanka Colombo (Accessed 14/08/2016)
[click to view]

[3] Report by: Water Integrity In Action, Curbing Illegal Sand Mining in Sri Lanka. 2013 (Accessed 14/08/2016)
[click to view]

Other Documents

Eroded river bank of the Maha-Oya, 2011. Source: Environmental Foundation Ltd.
[click to view]

River sand mining in Maha Oya. Source: Environmental Foundation Ltd.
[click to view]

A map of mined pits along the downstream of the Maha Oya. Source: Environmental Foundation Ltd.
[click to view]

Meta Information
ContributorEnvironmental Foundation Limited and EJAtlas collaborator Paola Camisani
Last update16/08/2016