This paper presents an object-oriented toolkit for building computer models for water resource planning.The focus is on building a program for flood calculations in river sytems with several reservoirs and water transfer structures.The foundation for the flood model is a framework for building hydrologic models.The general structural components of the hydrological system,their relation in the system topology and controlling the behaviour of the system during simulation.Hydrological models are ofter data intensive,and the framework is equipped with tools to handle both time series and spatially-distributed data in an efficient way.During development,effort has been put into supporting future changes and extensions to the model system,as well as creating sound reusable components that willbenefit future development and maintenance.A flood modelling application in the Norwegian river Gudbrandsdalslagen in described to illustrate the use of the toolkit.
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