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Al Neelian University (2017)

Hydrogeological Investigations In El Managil Area, Gezira State, Sudan

Musa Hamdan Eissa Hussian

Titre : Hydrogeological Investigations In El Managil Area, Gezira State, Sudan

Auteur Musa Hamdan Eissa Hussian

Université de soutenance : Al Neelian University

Grade : Master in Hydrogeology 2017

Résumé
The study area is located between Latitudes (14.20°N and 14.650°N) and longitude (32.90°E and 33.050°E) in El Managil locality south-west of the Gazira state, with an area of about 813.729 km². The main objective of this study was to deal with the development and management of water resources by determining the aquifer’s hydraulic parameters, source of recharge and the groundwater quality in the area. The hydrological system consists of two aquifers, the upper one is composed of fine-grained sandstone, and the lower is formed coarse to medium sandstone. The two aquifers are connected in some areas. The thickness of the bottom aquifer increases to the north of the study area. The depth to the static water level is variable, decreasing away from the centre of the area to the north and south directions. Low productivity of wells is observed in the center of the area, despite the passage of valleys because of the existence of a thick layer of mud, which prevents the infiltration of rain water to the underground aquifers. The hydraulic properties of the main (lower) aquifer were (using Jackob III method) : Through which hydraulic conductivity ranges between 1.02 x 101 and 1.53 x 101 m/min, Transmissivity ranges between 5.2 x 10-3 and 2.60 x 102 m²/min and Storage Coefficient between 1.16 x 10-6 and 2.03 x 103. Groundwater suitability for domestic use : according to TDS values, the groundwater in the area is fresh (<1000 ppm). The value of pH in the area ranged between (7.3 – 7.8), falling in the alkaline class, except for samples No. (6) and (11), which have pH of 6.93 and 6.83, respectively, and pH class of acidic water Total hardness ranged between (124– 320 mg/L), this may be attributed to presence of thick clay lenses, especially at well No. (9). Compared to WHO (2011), all samples fall within the permissible limit. , except for HCO3- , where seven sample had slightly high value. According to SAR, all samples are suitable. According to Magnesium hazard (MH) : seven of the samples are suitable for irrigation (MH < 50%), four of the samples are slightly high (MH 51 - 73%).

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