Using ArcSWAT to Predict Discharge in Ungauge Torrents of Thasos Island

Water resources management requires the knowledge of the environmental conditions and hydrologic processes. The development of Geographic Information Systems (GIS) has allowed the use of spatially and physically based hydrologic models in order to simulate the hydrology in a complicated natural system. It is very important to use such tools especially in regions with limited available data. In this context, the objective of this study is to model the hydrologic conditions in the island of Thasos by using the Soil and Water Assessment Tool (SWAT) in a GIS environment. In order to understand the hydrologic processes, it was required to predict the water balance of the island and simulate the discharges of its ungauged torrents. The outputs of the model revealed the simulated values of the hydrologic phases, the torrent discharges and a map that identifies the watersheds with the highest discharges. The results could be used by experts and by every interested authority in order to manage the surface stream water for various purposes, such as suppression of forest fires.