ABSTRACT
For the assessment of drought risk in the northern part of the Gezira Plain (Sudan), we have used all available information on the hydrologic system of the Nile as well as the results of the study undertaken by Reusing & Niestlé (1990) which is based on time series analysis and modeling of Nile-discharge and gauge-level. The statistically expected river discharges were transformed into waterlevels through rating curves and served as input to a groundwater flow model. To get reliable results it is necessary to collect and interpret different information about geology, hydrogeology and hydrology. In this respect a computer-based geologic model of the subsurface structures was set up to supply the groundwater flow model with the aquifer thicknesses. In addition to that, the possibility of using geostatistical methods to regionalise permeability values was evaluated. The ultimate aim was the preparation of maps showing the groundwater levels for different drought scenarios.
