Utilization of sophisticated hydroinformatic systems depends on the optimum use of appropriate input data. The main focus of the present project has been the development of a number of auxiliary data handling modules for a previously constructed IPT system. This system is an elaborate software capable of modelling a wide range of hydro-environmental phenomena. Data required for the implementation of the IPT system consist of hydro graphic and physical data regarding the geometry of hydro-environmental system and boundary and initial conditions. Due to inevitable high cost of these surveys in most cases the available data are scarce which reduces the efficiency of computer models. In this respect development of more sophisticated computer modelling schemes is in effective and techniques for enhancing the quality of the input data must be employed. The aim of this project has been to eliminate such difficulties by the use of modern IT techniques such as the optimization of physical data by genetic algorithms, fuzzy logic procedures, intelligent data bases and case based reasoning. To demonstrate the efficiency of the developed data handling modules a number of hydro-environmental problems in tidal river networks have been solved. It is shown that the modules developed in this project have general applicability and can be used to assist computer aided design and systems management in a wide variety of cases.