Maka-Diama Dam

Maka-Diama Dam
Name	Maka-Diama Dam
Country	Senegal
Location	Diama Department, Saint-Louis Region; Trarza Region
Status	Operational
Opening	1988
Dam type	Barrage
River	Senegal River
Length	270 m
Height	7 m
Purpose	Irrigation, navigation, flood control

Maka-Diama Dam The Maka-Diama Dam is a transboundary barrage on the Senegal River near the border between Senegal and Mauritania. Constructed in the late 20th century as part of basin development initiatives, it regulates upstream salinity intrusion, supports irrigation schemes, and enables navigation between inland waterways and the Atlantic Ocean. The project involved regional organizations and bilateral agreements among Sahelian states.

Location and geography

The structure lies near the town of Diama, Senegal within the Saint-Louis Region and adjacent to the Trarza Region of Mauritania. Situated on the lower reaches of the Senegal River, the site is downstream of the Manantali Dam and upstream of the river mouth at Saint-Louis, Senegal. The dam influences the Riverine floodplain that includes the Walo and the Delta of the Senegal River, and it interfaces with coastal features such as the Atlantic Ocean and nearby estuarine ecosystems.

Design and construction

Designed as a low-head concrete barrage, the project followed engineering precedents from river works like the Kpong Dam and the Diama (diama) structure concept used in regional water management. Construction was executed by international contractors under the oversight of agencies including the Organisation pour la mise en valeur du fleuve Sénégal (OMVS) and financing bodies such as the World Bank and technical partners like the Food and Agriculture Organization (FAO) and the African Development Bank. The intake and gate systems draw on hydraulic designs comparable to installations at the Volta River Project and the Aswan Low Dam while incorporating sluices and navigation locks to accommodate vessels akin to traffic on the Niger River.

Purpose and operations

Maka-Diama was commissioned to prevent seawater intrusion into the freshwater stretch of the Senegal River that threatened irrigation perimeters like the Maka irrigated zone and agro-industrial sites such as the rice schemes in the Senegal River Valley Development Project. Operations are coordinated with upstream reservoirs including Manantali Dam and downstream ports at Saint-Louis, Senegal to manage flows for irrigation, navigation, and flood attenuation. The barrage also supports transnational water allocation mechanisms established by the OMVS and complements regional transport initiatives linking to corridors like the Trans–West African Coastal Highway.

Environmental and social impacts

The barrage altered salinity gradients and modified habitats for species observed in the riverine assemblages comparable to changes seen in the Nile Delta and the Mekrou River basin. Effects included shifts in fisheries that impacted livelihoods in towns such as Richard-Toll and Rosso, Mauritania, changes to flood-recession agriculture practiced by communities near Dagana, and implications for wetlands recognized under conventions like the Ramsar Convention on Wetlands. Mitigation measures involved programs spearheaded by agencies such as the International Union for Conservation of Nature (IUCN) and donor projects supported by the European Union and the African Development Fund to address biodiversity, water quality, and resettlement concerns.

History and political context

The dam emerged from postcolonial efforts by states of the Senegal River Basin to assert sovereignty over shared resources, building on earlier treaties exemplified by accords like the 1959 Mali–Senegal water agreement and institutional evolution toward the OMVS framework. Political impetus included food security drives during the Sahel droughts of the 1970s and 1980s, with involvement from international partners including the United Nations and bilateral actors such as France. Debates around allocation, compensation, and benefits mirrored controversies seen in projects such as the Volta River Project and negotiations mediated by bodies like the United Nations Development Programme (UNDP).

Cross-border cooperation and management

Management of Maka-Diama is embedded within the OMVS institutional arrangements that also oversee infrastructure like Manantali Dam and coordinate policies among Senegal, Mauritania, Mali, and Guinea. Cooperative mechanisms include joint commissions, technical secretariats, and basin planning processes analogous to arrangements under the Nile Basin Initiative and the Senegal River Basin Development Project. Transboundary governance addresses water allocation, navigation rights, environmental monitoring with partners such as the World Bank, and dispute resolution modeled on precedents from treaties like the Indus Waters Treaty.

Category:Dams in Senegal Category:Dams in Mauritania Category:Senegal River basin