The water stage of the river becomes high when there is heavy rainfall.
Heavy rainfall is forecasted accurately at the earliest stage with advanced technology and skills and
it is announced to the public through
the mass media so that citizens can
prepare against possible flood in the
region.

To forecast flood, past flood records,
computer programs, weather forecasts,
and hydrological data such as rainfall,
water stages, and streamflow are
required, Hydrological data are
observed in real-time and automatically
telemetered from observation stations,
Computer programs with hydrological
data, weather forecasts and past
flood records are used to predict
how high the water stage will rise and alarm
flood risk areas as well as when
they will recede