AD. 45~598(Gogureo)

• Two cases recorded in “Samguksagi” (historical books for Gogureo history) and three cases in others
• Flood recorded by “Daesu(big flood) or Daewoo(heavy rainfall)”

AD. 221~612(Baekje)

• One case recorded in “Samguksagi” (historical books for Baekje history) and five cases in others
• Flood recorded by “Daesu(big flood) or Daewoo(heavy rainfall)”

Unified Shilla

• 21 cases of Drought, 17 cases of Famine

Kingdom of Korea

• 85 cases of heavy rainfall, 19 cases of big flood, 47 cases of Drought recorded in “Koreasa” (historical books for Korea history)

AD. 1441(Early Chosun dynasty)

• Water mark for measurement of river stages
• Rain gauge – the world first rainfall measuring appratus

AD. 1724~1776(Mid-Chosun dynasty)

• Flood forecasting of river using by water mark
• The oldest rain gauge in existence

AD. 1884(later Chosun dynasty)

• Rain gauge by Water storage type

AD. 1392~1910(Chosun dynasty)

• 671 cases of natural disasters recorded in “Chosunwangjosilrok” (historical books for Chosun history)

AD. 1987~1910(The Korea Empire)

• Established and operated temporary rainfall station in “Chesinguk”(old type Post office)

AD. 1915~1928

• Survey of weather, stage, discharge
• Survey stage stations by basins
• 11 rivers survey(1st)

AD. 1925

• Great flood occurrence in Seoul

AD. 1928~1939

• Published ‘Chosun river survey’(1929)
• Enactment of ‘Chosun enforcement decree of the river act’(1927)
• River survey(2nd)

AD. 1934

• Great flood occurrence(any other place in the southern)

AD. 1945~1961

• launched Hydrologic investigation work(1947)
• launched Water Resources Development by Technical support of ECAFE(1955)
• River Act was enacted(1961)

AD. 1962

• Published ‘Hydrologic data in korea’
• Created Water Resources Policy Bureau in Ministry of Construction

AD. 1965~1974

• The four major river basin survey
• The International Hydrological Decade(IHD)

AD. 1968

• Designated Han river basin as automatical flood forecasting and warning facilities(UN ECAFE/WMO Typhoon committee)

AD. 1974

• Han river Flood Control Office established and operated flood forecasting and warning facility

AD. 1979

• Enactment of hydrologic measurement service regulations

AD. 1980

• Enactment of the river design guideline

AD. 1987

• Nakdong river Flood Control Office established
• A great flood at Han river and Nakdong river

AD. 1990

• Geum river Flood Control Office established
• Seomjin river Flood Control Office established
• A great flood at Han river

AD. 1991

• Yeongsan river Flood Control Office established

AD. 1995

• Completed flood forecasting and warning facility at Anseong river

AD. 1998

• Installed flood forecasting and warning facility at Hyeongsan river
• Installed flood forecasting and warning facility at Sapgyo river

AD. 1999

• Installed flood forecasting and warning facility at Taehwa river
• Operated flood forecasting and warning system at Imjin river basin
• A great flood at Imjin river basin(August)

AD. 2000

• Integrated flood forecasting and warning system development

AD. 2001

• Installed flood forecasting and warning facilities, flood forecasting systems at principal branch rivers
• Installed flood forecasting and warning facility at Gap river

AD. 2002

• A great flood by typhoon Rusa(August)

AD. 2003

• Imjin River basin rain Rader observatory Operation

AD. 2004

• Published Hydrological survey manual
• WINS, WAMIS service open

AD. 2005

• Hydrological investigation advance five-year plan making
• The river information center of Han River Flood Control Office established

AD. 2006

• A great flood by typhoon and seasonal rain front(Han river, July)

AD. 2007

• NHQMS(National hydrologic data quality Management system) development
• Hydrological survey center established

AD. 2009

• beginning of construction of The four major river restore project
• Biseulsan rain Rader observatory established
• Hydrological investigation master plan making

AD. 2010

• Flood forecasting system development and improvement (2010 ~ 2012)

AD. 2011

• Sobaeksan rain Rader observatory established

AD. 2012

• Decided as a presidential country on hydrological service group

AD. 2013

• Conclusion of HRFCO∙KICT MOU

AD. 2014

• 40th anniversary for Flood Control of Korea
• Take place 3rd workshops for hydrological division in Typhoon committee