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Water quality and water-use conflicts in Lake Taabo (Ivory Coast)

Abstract : The Lake Taabo (Ivory Coast, Africa) results of the construction of the Taabo dam on the Ban- dama River. The changes in the water level of the 69-km² lake depend on 1) the rainfall linked to alternating dry/wet seasons; 2) the extraction of water for human uses; 3) the discharge of water from the upstream dam and the volumes tur- bined by the Kossou dam; 4) the various an- thropic effects (discharge of untreated waste water from towns and industries, and leaching from agricultural land). The average concentra- tions of nutrients (NH4-N: 1.1 mg/L, NO3-N: 1.62 mg/L, PO4-P: 10 mg/L, SiO2: 15 mg/L) and chlo- rophyll a (from 4.8 to 16.5 μg/L, average 11.4 μg/L) indicates some degree of eutrophication. The cumulated effects that threaten the ecosys- tem (degradation of water quality and eutrophi- cation) are such that they are likely to interfere with various water uses. In a context of growing health and environmental concerns in Africa, this study demonstrates conflicts between dif- ferent uses of this water resource and the urgent need for an appropriate policy including specific monitoring of lake water quality, wastewater control, and a programme to reduce agricultural fertilizers.
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Submitted on : Wednesday, January 23, 2013 - 3:46:55 PM
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Noël Groga, Alassane Ouattara, Sébastino da Costa, Alain Dauta, Olivier Beauchard, et al.. Water quality and water-use conflicts in Lake Taabo (Ivory Coast). Open Journal of Ecology, SCIRP, 2012, vol. 2, pp. 38-47. ⟨10.4236/oje.2012.21005⟩. ⟨hal-00780251⟩

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