The first step to hydrological modelling in the area is to define the usage characteristics and basins of the areas. For this, first of all, the slope of the area, the length of the flow, etc. basic features need to be determined. Basin features can be obtained with digital height models (DEM) and GIS software. The study aims to determine the water collection area and drainage lines of Niğde Ömer Halisdemir University campus by using the Numerical Height Model (SYM) obtained from the area. In this study, ArcGIS 10.1 software, 3DAnalyst plug-in and numerical height model (DEM) and Arc-Hydro plug-in were used to determine water collection areas and water flow directions. For hydrological modelling of the study area; The stages of SYM renewal, filling the gaps, determining the direction of flow, calculating the cumulative flow, determining the river, dividing the river, creating a water collection area, polygonising the water collection area and determining the drainage network were used. According to the results obtained; 386 water collection areas were identified in the study area. The water collection area of ??the campus is determined as 153,24 km2 and the total circumference of this area is 1,945 km. The total length of the drainage lines within the water collection area of ??the campus was determined to be 31.20 km. In hydrological modelling studies in watersheds, Arc-Hydro software has been found to achieve very useful and reliable results.