Publisher's Synopsis
This study aimed to reveal that the computer simulation models play an important role in watershed management and decision making. The SWAT (Soil and Water Assessment Tool) model has been used for the hydrologic (watershed level) simulation and APEX (Agricultural Policy/Environmental eXtender) model has been used for crop growth and irrigation simulation (farm level). Both models have been used to simulate crop water requirement in field condition, but at different scales. To achieve this task the SWAT and the APEX models have been used in GIS (Geographical Information Systems) framework.
