Geographical and hydrological effects of nubian sandstone formations on ground water in Khartoum State – Sudan

The research deals with the geographical and hydrological location of Khartoum state within the scope of the Nubian sandstone extension, and the effects of this on groundwater. To achieve this, 9 samples were analyzed from the wells dug in Omdurman, Khartoum and Bahri to identify the structure and composition of layers and depths of water, in addition to 30 other samples for chemical analysis And the physical of some elements to know the specifications of water and its suitability for human use. The research concluded with a number of results, including that there is a difference in the components of the Nubian sandstone, as its percentage in Omdurman is 67%, the number of layers 10 and Khartoum 71% and the number of layers 16, and in Bahri 82% and the number of layers 21 and thus it is higher than Omdurman and Khartoum. Water levels vary even within the region from one well to another in Omdurman, which is located at depths of 490, 690, and 800 feet, and in Bahri, it is located at depths of 530, 690, and 725 feet, and the hose is located at depths of 340, 505, and 585 feet. Soluble, nitrite and mineral compounds are good according to Global standards for water except for a few of them, with the high level of ammonia in Omdurman and Khartoum higher than 0.1mg/l, which is an indicator of pollution.