Browsing by Author "KHEIRALLA K. M, MOHAMED A.A"

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HYDROGEOLOGICAL AND HYDROCHEMISTRY INVESTIGATION IN BARA BASIN: A CASE STUDY OF THE NORTH KORDOFAN, SUDAN
(2013) ELHAG A.B, ELZIEN S.M; KHEIRALLA K. M, MOHAMED A.A
The study area is situated in the North Kordofan State-western Sudan the region is characterized by semi-arid and poor savannah climatic zone, where acute shortages of water are experienced. The purpose of this study is to assess the groundwater quantity and quality. The study area is covered by the basement complex (Precambrian age) which is overlain by superficial deposits (Tertiary to Quaternary age). The sedimentary basin consists of two aquifers called upper and lower, mainly comprising of sand and a few amounts of gravels and clays. The results of pumping test revealed the variation in hydraulic properties of the aquifer. Where, the average transmissibility reach about 225 and 1692 m2/d and hydraulic conductivity was estimated to be 2.3 m/d. The present investigation has brought to light the fact that the area promising in term of groundwater resources estimated to be 52.5x109 m3 in the Bara basin. The fluctuation in the static water level depending mainly on the annual recharge and discharge rates range between 0.5 to 3.0 m. The volume of annual recharge estimated to be 41% with compared to annual discharge. On the other way, the total annual extraction values of groundwater resources equal about 1.3 x109 m3, which is more than the annual recovery rates. In term of chemical composition of groundwater, the TDS values range from 300 to 3060 ppm and EC values ranges between 415 and 4400 micro ohms/cm. in the study area hydrochemical analysis using standard diagrams to classified hydrochemical characteristics of both aquifers (upper and lower). Groundwater is predominantly of Ca-HCO3 to Na-Cl type of hydrochemical facies and it is apparently suitable for drinking demands.