Abstract
An object-oriented modeling system (ACRU2000) was created to enableusers to simulate the hydrological and environmental effects of various land uses in theRepublic of South Africa. The model was designed in the Unified Modeling Language(UML) and implemented in the Java programming language. The ACRU2000 modelhas seven basic object types with three of these used by modelers as primary objects tosimulate environmental events. By use of these three objects, components, processesand data, a detailed and versatile modeling system was developed to simulate spatialcomponents and processes in one, two or three dimensions on both PC and Unixplatforms. In addition, the ACRU2000 system was designed for easy expansion as new objects are created and linked into the existing structure without major revision. Thisresearch paper describes the model design and construction methodology of a object-based model to simulate southern African surface hydrology and related environmentalprocesses.
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