Abstract
A water quality simulation computer system was developed to utilize detailed environmental information on a watershed effectively and rapidly for planning of river basin management. The system was composed of a personal computer and mainframe computer. A water quality simulation model and display system of environmental information worked on the personal computer. The database on a watershed was constructed on the mainframe computer. The system was applied to the Oyabe river. The water quality observed in 1989 was well simulated with reasonable parameter values, although there were disagreements for some tributaries. The functions, which enabled effective utilization of the system, were also shown.
