The real values of the river water level and rainfall
were transformed into symbolic representation
determined by the domain expert. Tables 1a and 1b
below show the category used for Kuala Nerang and
Senara river water levels. There are four categories of
flood stage: Normal, Alert, Warning and Danger.
Danger signifies flood has occurred in the area. The
letter ‘wl’ indicates the present water level at the
particular stations. The stations have different water
levels as they are located at different latitude.