Evaluation of groundwater quality in Dongula basin: the Northern state of Sudan

The purpose of this paper is to evaluate the quality and chemical features of groundwater in the Dongola basin, Northern State, Sudan. The majority of water samples were moderately hard water, and temporarily hard – carbonate and bicarbonate hardness. The dominant anion is carbonate and bicarbonate (CO3 --, HCO3 -); and the dominant cation is sodium on the west side of the river (water type – Trona rocks). The majority of water samples taken at the west river bank were (sodium-calcium-magnesium)-(bicarbonate-sulphate) type, while at the east river bank, the majority was (sodium-calcium-magnesium)-(bicarbonate) type. (Sulphate-chloride) type was found for samples taken at the two banks of the river while (sulphate) and (chloride) types were found only in samples taken at the west bank.