The purpose of this study is to create maps that identify potential sites for rainwater harvesting techniques (RWHT) in South Darfur State (SDS), using the Nyala basin as a case study. The basin experiences flash floods, which generate significant amounts of runoff. The RWHTs aim to conserve and maximize the available water resources in order to improve crop productivity. After conducting a literature review and consulting with experts in the field, seven RWHTs were selected for the study: runoff basin system, contour furrows, and flat, flood, pond, check dam, on-farm pond, and bench terraces. The data analysis was carried out in the ArcGIS environment and involved spatial analysis and data re-classification, supported by multi-criteria analysis. The multi-criteria analysis consisted of five selection criteria (rainfall, runoff, land use, slope, and soil texture), each with sub-indicators to assign relative weight for each RWHT. These selection criteria were based on an extensive literature review and five expert-based surveys that assessed the impacts of RWHT on the study area using an Analytic Hierarchy Process (AHP). The consistency ratio between the experts' opinions was evaluated using the pair-wise comparison. Final weights were computed for each criterion, and the method of spatial analysis and data re-classification was employed to generate the required suitability maps. The results show that runoff basin systems are recommended for use in the southwest high-rain parts of SDS, and it is the most suitable technique for about 30% of the area of SDS. Contour furrows, flat and terrace techniques are highly suitable for 70% of the state area with moderate rainfall to grow pasture. Flooding techniques are not recommended except in the high rainfall southern areas near Bahr El Arab. The check dam and pond techniques are suitable in the middle to the southern areas that are occupied by small surface streams running towards Bahr El Arab. Farm ponds or flooding techniques are not suitable for Debla's hilly areas or the northern areas with low rainfall. For the Jabal Mara area, it is recommended to employ bench terraces. Overall, this approach can help decision-makers efficiently plan water resource management in arid dry areas suffering from water shortages, ensuring sustainable development of water resources.