Extreme flow events have had a significant impact on populations and their activities in recent decades. To reduce the impacts associated with their advent a analysis between extreme hydrological phenomena and climate variability is necessary. However, qualitative data accessing difficulties and explanatory variable definition of extremes hydrological phenomena limit extreme flows rate studies. This study proposes the analysis the variability of the floods and the low flows at the Bianouan hydrometric station. Thus, five (5) floods characteristics variables (QCX5, QXJA, F90p, F95p and F99p) and three (3) for, the low flows (VCN10, QJNA and F10p) were extracted daily flows from the Bianouan hydrometric station from 1 January1962 to 31 December 2005. The variability of these extremes has been studied by the trend analysis (linear regression) and of the stationarity (Pettitt and Hubert tests). The results show that for flood variables the negative trend is very significant and ruptures are observed in 1980. For low flow variables the negative trend is significant and the ruptures are observed in 1981. From this study, we can deduce that the ruptures observed in the rains and flows average in the end 1960s and early 1970s have affected later the extreme flows around the 1980s.

The department of Daloa is located in central-west of Côte d’Ivoire. It belongs to the Lobo river watershed, a part of the Sassandra river. Water supply of populations from the city is done by the river Lobo. This water resource is faced to the pollution of water quality. This pollution came from anthropogenic activities. This study is carried out to know the physico-chemistry quality of water from Lobo river Daloa. The hydrochemical and multivariate statistical analysis technics were used for the study. The results show that the water of Lobo river is acid with pH value which ranges from 6.6 to 6.9 ; with an average of 6.8. Water is fresh with a low electric conductivity value which range from 192.3 µS/cm to 316 µS/cm. The chimical facies of water is the hydrofacies of is HCO3>Mg2+> Ca2+. The mineralization of water from Lobo river is led by the contact water-rock and anthropogenic activities. The study presents the physico-chemical characteristics of water from Lobo River. It determined the potential sources of pollution of surface water. Then, the study ensures sustainable management of the resource.

The mining industry is a main sector for economic and social development of a country. However, this industry generates many negative impacts on human and biophysical environments. Located south-east of C

The workshop of the interdepartmental committee responsible for managing household waste in Abidjan (Ivory Coast) in 2007 showed that the landfill site should be chosen out of the coastal sedimentary basin to protect the groundwater of the Continental Terminal aquifer against pollution. Indeed, this aquifer provides the potable water to Abidjan populations and also assures uniformity of the price of water by the water company of the Ivory Coast. But, given the groundwater flow and the possibility of transfer of fluid between the discontinuous and continuous aquifers, is it possible that an activity taking place outside the coastal sedimentary basin of C