CONTRIBUTION TO THE HYDROCHEMICAL KNOWLEDGE OF AQUIFERS IN THE DEPARTMENT OF TANDJILE-EAST, SOUTHERN CHAD

The province of Tandjile is one the 23 provinces Republic Chad. drinking water supply rate in this region remains low. Part population obtains its through open wells and / or surface water. Climatic anthropogenic variations recent years have shown how much groundwater can be influenced both terms quality quantity to used. objective study provide knowledge on state hydrodynamic hydrochemical parameters aquifer department Tandjile-Est help decision-makers their approach. This based mainly existing data collected Chadian institutions literary journals. analysis these showed that lithology represented by clayey, sandy, lateritic formations clay-sandy mixtures. aquifers are sandy sandy-clayey. temperature values equilibrium with those air, pH shows close neutrality electrical conductivity below standards (Chad, WHO). area not very mineralized concentrations elements indicating contamination (nitrates, chloride, etc.) clearly traces. Chemical analyzes revealed two chemical facies: calcium magnesium bicarbonate sodium potassium bicarbonate.