Reports and Papers

Fedra, K. and Jamieson, D.G.
An object-oriented approach to model integration: a river basin information system example. In: Kovar, K. and Nachtnebel, H.P. [eds.]: IAHS Publ. no 235, p669-676.

The WaterWare system

Developed originally within the framework of a EUREKA project (EU 487), and in a case study of river Thames, WaterWare has been further developed for applications to the Lerma basin in Mexico in a project with the National Water Commission (Jamieson and Fedra, 1995), and both the West Bank and the Gaza strip in Palestine , in a project with the Palestinian Hydrology Group (Jamieson and Fedra, 1996b).

The system is based on a modular framework of GIS and data bases, that allows to link various simulation and optimization models into this framework, providing a common user interface and consistent, shared data resources as well as mechanisms for the communication between the modules of the system (Jamieson and Fedra, 1996a). From a users point of view, {\sf WaterWare} consists of a central information systems component with GIS and data bases as well as the multi-media hypertext system, that provides background information and describes a specific river basin. Linked to this data layer are a set of models, that can perform scenario analysis, i.e., answer WHAT--IF and HOW--TO questions for various water quantity and quality issues, as well as related engineering, environmental, and economic aspects (Fedra and Jamieson, 1996). WaterWare currently includes a dynamic (daily) rainfall-runoff model; an irrigation water demand estimation model based on FAO's CROPWAT; a 2D, vertically integrated finite-difference groundwater flow and transport model; a dynamic water resources model; and both a stochastic and a dynamic river water quality model, that use a waste load allocation optimization model as a post-processor, and a rule-based environmental impact assessment expert system.

These tools are embedded into a user interface that translates the specific functionality of a given model into a decision support tool: the component models and tools are restructured in terms of decision variables and performance variables, relating to the objectives, criteria, and constraints of various tasks and decision problems.

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