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Abstract
An Object‐Oriented and OpenGIS supported hydro information system (3O‐HIS) is developed taking into consideration the fundamental Open technologies and Open Standards using Java as the core programming language; SQL as the information interchange language; the OpenGIS consortium Specifications as the standard for the GIS application integrated into the system (Open Source projects like OpenMap as Geographical Information System and PostgreSQL with PostGIS extension as relational Database) and the Internet technologies as TCP/IP (communication protocols). The 3O‐HIS acts as a platform which can facilitate standard formats for data exchange and code sharing through Object‐Orientation and XML. The additional advantages of the 3O‐HIS are web‐based application with distributed computing and as desktop application; easy integration with different modules based on open source. A validation of the 3O‐HIS is conducted against the Upper Mersey river basin with emphasis on portability, extensibility and user friendliness. It is readily available for carrying a wider range of software tools for an integrated water basin management.