200 - Typhoon Committee

ESCAP/WMO
Typhoon Committee Annual Review 2007
Table 2.5 Flood Control Effect Evaluation of Dam
Items
Control rate of peak inflow
Downstream flood control
Evaluation Method
(peak inflow - max. outflow) / peak inflow
water level difference without and with dam or flow difference without and
with dam
Table 2.6 Flood Control Result of Each Dam
Items Juam Dam Seomjingang Dam Sum
Rainfall(mm) 317 160
Dam Storage (106m3) 105 22 127
Dam’s flood
control ratio
Max. Inflow 3,362 640
Max. release 1,982 413
Control rate(%) 40 36
Design flood(m3/s) 4,154 1,868
During this flood event, a storage for two dams attained
to 127MCM Due to this volume stored in Juam and
Seomjingang Dam, flood damage at up- and downstream
sites of two dams was very largely mitigated.
Also the water level of Songjung point in downstream
site of two dams was lowered to 1.76m from EL14.85m
without Dam to EL13.09m with Dam along with this flood
control.
4) Conclusion and Recommendation
During this heavy rain periods, flood control at two dams
and downstream major points was performed successfully
by reasonable reservoir operation in Seomjin River basin.
Recently abnormal weather and typhoon have induced
severe tropical storm or flash flood. The flood damage
has been increased by progressing urbanization and
industrialization. On the other hand, water resources
facilities such as multipurpose dam for flood regulation
is difficult to build for the antagonism of residents.
According as scientifically flood control system between
stream and flood regulation structures is able to maximize
flood control ability and the reliable meteorological/
hydrological analysis system can reduce flood damage,
the more scientific flood control management system
have to be developed consecutively.
Use of integrated data service system
The Water and Management Information System(WAMIS;
Water Management Information System) is a integrated
system which can service the discharge, water quality,
meteorological data, etc.
This system was based on the cooperation with
three organizations(Ministry of Construction and
Transportation, Ministry of Government Administration
and Home Affairs and Ministry of Environment) related
to water and environment. Figure 2.10 shows the service
interface to the stage data.
c. Interaction with users, other Members,
and/or other components
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