Search

The control of water discharges in the El Kerma area is of paramount importance. These soils, which are generally rich in clay materials, are characterized by a (very) low permeability that leads to a rapid rise in pore pressure in the event of a massive influx of water. Thus, the prediction of the rate of water infiltration is essential for the prevention of flood risks. It is mainly stormwater that must be feared. However, these waters cannot always be carried out in a network, because of the connection distance, or the insufficiency of its section in front of the extension of the waterproofed soils, which transport too fast high flows. Sanitation and urban development specialists are interested in the increase in impervious surfaces due to the development of urbanization that leads to excessive runoff flows during rainy periods. Their control is therefore much more delicate than that of wastewater, whose flows are generally low and spread over time. The objective of this part is to study the infiltration regimes by using three models chosen for their simplicity (Philip, Green, and Ampt) and compare them to obtain the most effective model. Unfortunately, the result was not adequate since the infiltration time of the treated sample was short.

The present study deals with the physical and chemical characteristics of the water of sebkha of Oran ponds. In an attempt to study the environmental impact on water quality, fifty samples were collected and analyzed. The values obtained were compared with values recommended in water quality standards by WHO. The findings of the study show that the water resources in the study area are evolved from Mg-HCO 3 water types to Mg-Cl- water types through Mg-HCO 3 -Cl- water types. The salinization is the main source of the pollution in this basin. It is related to aquifer conditions.

Growing populations and increasing industrialization cause increase in living standard, which result in decrease in the quality of water and may put stresses on natural waters by impairing both the quality of the water and the hydrological budget. This research aims at determining the origin of the chemical elements of groundwater from the Oran sebkha basin. It applies the inverse geochemical modeling to derive the sources of variation in the hydrochemistry by Belkhiri et al. (doi: 10.1016/j.geoderma.2010.08.016 , 2010). Fifty-five water samples were selected from different point in Oran sebkha basin for sampling purpose in July 2011. Physico-chemical parameters such as pH and electric conductivity were measured in situ. Moreover, chloride, sulfate, alkalinity, calcium, magnesium, sodium and potassium were measured in the laboratory. Inverse geochemical models of the statistical groups were developed using PHREEQC to elucidate the chemical reactions controlling water chemistry. The inverse geochemical modeling demonstrated that relatively few phases are required to derive water chemistry in the area. In a broad sense, the reactions responsible for the hydrochemical evolution in the area fall into three categories: (1) dissolution of evaporite minerals; (2) precipitation of carbonate minerals; and (3) weathering reactions of silicate minerals by Belkhiri et al. (doi: 10.1016/j.geoderma.2010.08.016 , 2010). The high values of the physico-chemical parameters of water obtained in the present study sites indicate a variation in the physico-chemical parameters demonstrated that relatively few phases are required to derive water chemistry in the area. Range of values was found as pH (5.1–7.6), conductivity (720–15,820 μS cm−1), chloride (994–7,810 mg l−1), sulfate (6.1–112.4 mg l−1), alkalinity (421–19,962 mg l−1), calcium (80–680 mg l−1), magnesium (212.4–4,525 mg l−1), sodium (124.2–4,687.4 mg l−1) and potassium (0.9–42.5 mg l−1).