Managing Hydrogeological Risk in the Iullemeden Aquifer System
The lullemeden sedimentary groundwater basin, composed only by the cretaceous calcareous sandstone Continental intercalaire and the tertiary sandstone Continental Terminal aquifers, is located in Mali, Niger and Nigeria with minor, non-connected sections in Algeria and Benin. One aquifer in Mali, tree in Niger and four in Nigeria compose the Continental Terminal. The Iullemeden Aquifer System (IAS), which covers an area of 525 000 km2 with 31 000 km2 in Mali, 434 000 km2 in Niger and 60 000 km2 in Nigeria, represents one of the major freshwater reservoirs of West Africa. It received significant seasonal water rainfall and is linked to many humid areas and ecosystems.
The following categories of environmental threats to the aquifer and the related ecosystems have been identified :
(a) land use change in recharge areas and humid zones of the IAS (i.e. because of 1-deforestation: in Niger : weak productivity of the forests (0,1 to 1,5 stere/ha/year) against 87% of the energizing needs between 1,5 and 2 millions tons of firewood per year. In Mali: 90% of the needs of firewood; 2- The silting of the rivers) ;
· The pollution of various origins: domestic, industrial, mining, artisanal, agricultural;
1. identification of transboundary risk and uncertainty issues;
The scope for management of transboundary risk and conflict in the IAS is constrained by the scientific uncertainty on the aquifer system and by the impacts of climatic change. Further causes for indecision relate to social and policy uncertainty and sudden Basin unawareness.
To address these risk and uncertainty aspects the project will adopt a risk-based management approach. The emphasis can be expected to be on preparedness, responsibility, with monitoring and feedback to jointly address, mitigate and share risk and reduce uncertainty.
Finally, the MSP-GEF project is an opportunity for Mali, Niger and Nigeria to :
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|Project Status||Project Completion|
Mar 30, 2007 05:00
Mar 30, 2008 05:00
|Focal Area||International Waters|
|GEF Allocation to project||0.95M US$|
|Total Cost of the project:||1.73M US$|
|Countries:||Mali, Niger, Nigeria|
|Lead Implementing Agency||United Nations Environment Programme (UNEP)|