A user-friendly decision support system (DSS) for long-term reservoir opera
tion has been introduced with an eye to practical use. The system can assis
t reservoir managers to work out applicable rules for real-time reservoir o
peration. The DSS model has already been applied experimentally to the main
reservoirs in Taiwan with success. In this study, Tsengwen Reservoir, the
largest reservoir in Taiwan, was chosen to test the applicability of the mo
del. The simulation results show that the DSS is not only well suited to lo
ng-term reservoir operation, but also very easily applied. A handy DSS was
designed for user-friendly computer interaction with Microsoft Excel in the
Windows system. Users can survey on-line reservoir operation with a browse
r on the World Wide Web (WWW). The uniform resource locator of the DSS is h
ttp://wrm.hre.ntou.edu.tw/. So users may easily access the DSS via the Inte
rnet.