RESUMO
This study concerns the Souss upstream basin. The objective is to investigate the characteristics of surface water and groundwater, to assess the impact of artificial recharge as reinforcement of the natural replenishment and assess the renewal of groundwater under semi-arid area. Two major water types are observed: (i) surface waters and upstream springs (least mineralized) and (ii) all groundwater samples (prevailing calcium and magnesium bicarbonate water type). Water isotopes show a low evaporation of precipitations during infiltration. Impoverishment in heavy isotopes is the characteristic of mountain rainfalls, or of a climate colder and wetter than present. Carbon-14 activities (34-94 pmc) indicate a long residence time. The artificial recharge is low compared to the reservoir volume, due to which the renewal rate is also low.
RESUMO
This work deals with the estimation of the water content of several physico-chemical parameters in a landfill (Etueffont, Belfort, France), and their impact on the quality of the underground water. Samples were collected monthly from May 1998 to May 1999 with a vertical bottle, from the output of the landfill and from eight wells. The results showed high concentrations of most parameters in the well PZ30 and PZ3, situated near the landfill. The spatio-temporal distribution of the physico-chemical parameters (T, pH, EC, Eh, O2, Cl-, NO3-, SO4(2-), Na+, Ca2+, Mg2+, K+, Cu2+, Ni2+, Mn2+, Zn2+ and total iron) in the 8 wells was governed by geological, hydrogeogical, physical and chemical, and climatic factors. In addition, the concentrations of contaminants decreased in the last well (1 km from the landfill), indicating a purification and dilution effect. Nevertheless, we suspect short-term degradation of the groundwater in the Etueffont site.