Mekong River Commission
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1 U Mekong River Commission Regional Flood Management and Mitigation Centre Weekly Flood Situation Report for the Mekong River Basin Prepared at: //, covering the week from the th June to the nd June Weather Patterns, General Behaviour of the Mekong River and Flood Situation General weather patterns During the week of th June to th June five weather bulletins were issued by the Department of Meteorology (DOM) of Cambodia. The weather maps of the th June and st June are presented in the figures & below: Figure : Weather map at : UTC on June Figure : Weather map at : UTC on June Figure : KURIJA s track and predict (Source: MRC Weekly Flood Situation Report Week th nd June Page
2 Moderate South-West (SW) Monsoon On June, the strong Southwest monsoon was prevailed over Andaman Sea, the Gulf of Thailand, Thailand and Indochina Peninsular (figures &). Tropical depressions (TD), tropical storms (TS) or typhoons (TY) On June 9, the Japan Meteorological Agency (JMA) began to monitor a Tropical Depression (TD) in the East Sea. In the morning of June, the TD was prevailed over East Sea near the middle part of Viet Nam and then became TS is called KUJIRA (figures & ). Over weather situation Due to the weather phenomenawas mentioned as of the above during last week, there was moderated rainfall at some stations in LMB such as at Chiang Khan was recorded mm (on June ), at Kompong Cham.9 mm (on June ). See figure and table A for more detail. MRC Weekly Flood Situation Report Week th nd June Page
3 Figure : Weekly Rainfall Distribution over the LMB from June, MRC Weekly Flood Situation Report Week th nd June Page
4 General behaviour of the Mekong River During the last week, the water levels at upper stations of LMB were above or around the Long Term Average (LTA). From middle part to downstream of LMB (from Paksane to Tan Chau/ Chau Doc), the water levels were below the LTA. For stations from Chiang Saen and Luang Prabang Compared to the long term average (LTA), during the last week the water levels at these stations were above the LTA. Except, in the last weekend, the water levels were slightly decreased below the LTA. For stations from Chiang Khan, Vientiane and Nong Khai and Paksane Compared to the long term average (LTA), during the last week the water levels at these stations were fluctuated around the LTA. For stations from Thakhet/Nakhon Phanom to Pakse Compared to the long term average (LTA), during the last week the water levels at these stations were below the LTA. For stations from Stung Treng to Kampong Cham Compared to the long term average (LTA), during the last week the water levels at these stations were slightly increased below the LTA. For stations from Phnom Penh to Koh Khel/Neak Luong Compared to the long term average (LTA), during the last week the water levels at these stations were below the LTA. Tan Chau and Chau Doc Compared to the long term average (LTA), during the last week, the water levels at both stations were below the LTA, except at Chau Doc only on th June, the water level was above LTA. Note: For areas between forecast stations, please refer to the nearest forecast station. Flood Situation Flood stage or alarm stage: No alarm stage (where the forecast is expected to reach flood level within three days) was reported anywhere on the mainstream of the Mekong River during the last week. Water levels were still significantly below flood levels (as defined by the national agency) at all forecast stations. Damage or victims: No damage or loss of life due to river flooding was recorded anywhere along the Mekong River during the last week. For more details see the following annexes: - tables and graphs for water level and rainfall for the last week in Annex A - a graph for accuracy in Annex B - a table of forecast achievement in Annex B - tables and graphs for performance in Annex B - the water level graphs showing the observed water level for the season in Annex C MRC Weekly Flood Situation Report Week th nd June Page
5 Annex A: Graphs and Tables Table A: observed water levels Unit in m Jinghong Chiang Saen Luang Prabang Chiang Khan Vientiane Nongkhai Paksane Nakhon Phanom Thakhek Mukdahan Savannakhet / / / / / / / / Khong Chiam Pakse Stung Treng Kratie Kompong Cham Phnom Penh (Bassac) Phnom Penh Port Koh Khel Neak Luong Prek Kdam Tan Chau Chau Doc Table A: observed rainfall Unit in mm Jinghong Chiang Saen Luang Prabang Chiang Khan Vientiane Nongkhai Paksane Nakhon Phanom Thakhek Mukdahan Savannakhet / nr.... nr nr nr nr nr nr. nr. nr /... nr nr nr nr. nr. nr nr nr nr 7. 7/... nr 7.. nr...7 nr....7 nr.... / nr nr nr nr nr nr nr nr 7.9. nr nr..7. 9/. nr nr 9..9 nr nr. nr 7. nr nr nr nr nr nr nr /. nr. nr nr. nr nr... nr.. nr 7. / nr nr nr. nr 7. nr..9 nr nr. nr / nr nr... nr 9. nr.. nr nr nr nr nr. Khong Chiam Pakse Stung Treng Kratie Kompong Cham Phnom Penh (Bassac) Phnom Penh Port Koh Khel Neak Luong Prek Kdam Tan Chau Chau Doc MRC Weekly Flood Situation Report Week th nd June Page
6 Figure A: Observed water level and rainfall for Jinghong, Chiang Saen, and Luang Prabang Jinghong Chiang Saen Luang Prabang / / 7/ / 9/ / / / / / 7/ / 9/ / / / / / 7/ / 9/ / / / Jinghong Chiang Saen Luang Prabang hour rainfall at 7am (mm) / / 7/ / 9/ / / / hour rainfall at 7am (mm) / / 7/ / 9/ / / / hour rainfall at 7am (mm) / / 7/ / 9/ / / / Page MRC Weekly Flood Situation Report Week th nd June
7 Figure A: Observed water level and rainfall for Chiang Khan, Vientiane, Nongkhai, and Paksane Chiang Khan Vientiane Nongkhai Paksane / / 7/ / 9/ / / / / / 7/ / 9/ / / / / / 7/ / 9/ / / / / / 7/ / 9/ / / / Chiang Khan Vientiane Nongkhai Paksane hour rainfall at 7am (mm) 7 / / 7/ / 9/ / / / hour rainfall at 7am (mm) / / 7/ / 9/ / / / hour rainfall at 7am (mm) 9 7 / / 7/ / 9/ / / / hour rainfall at 7am (mm) / / 7/ / 9/ / / / MRC Weekly Flood Situation Report Week th nd June Page 7
8 Figure A: Observed water level and rainfall for Nakhon Phanom, Thakhek, Mukdahan and Savannakhet Nakhon Phanom Thakhek Mukdahan Savannakhet / / 7/ / 9/ / / / / / 7/ / 9/ / / / / / 7/ / 9/ / / / / / 7/ / 9/ / / / Nakhon Phanom Thakhek Mukdahan Savannakhet hour rainfall at 7am (mm) / / 7/ / 9/ / / / hour rainfall at 7am (mm) / / 7/ / 9/ / / / hour rainfall at 7am (mm) / / 7/ / 9/ / / / hour rainfall at 7am (mm) / / 7/ / 9/ / / / Page MRC Weekly Flood Situation Report Week th nd June
9 Figure A: Observed water level and rainfall for Khong Chiam, Pakse, Stung Treng, and Kratie Khong Chiam Pakse Stung Treng Kratie / / 7/ / 9/ / / / Pakse / / 7/ / 9/ / / / / / 7/ / 9/ / / / Stung Treng hour rainfall at 7am (mm) / / 7/ / 9/ / / / / / 7/ / 9/ / / / Kratie hour rainfall at 7am (mm) / / 7/ / 9/ / / / / / 7/ / 9/ / / / Khong Chiam hour rainfall at 7am (mm) / / 7/ / hour rainfall at 7am (mm) 9/ / / / MRC Weekly Flood Situation Report Week th nd June Page 9
10 Figure A: Water level and rainfall for Kampong Cham, Phnom Penh (Bassac and Port), and Koh Khel Kompong Cham Phnom Penh (Bassac) Phnom Penh Port 9 Koh Khel / / 7/ / 9/ / / / / / 7/ / 9/ / / / Phnom Penh (Bassac) Phnom Penh Port hour rainfall at 7am (mm) / / 7/ / 9/ / / / / / 7/ / 9/ / / / / / 7/ / 9/ / / / Koh Khel hour rainfall at 7am (mm) / / 7/ / 9/ / / / / / 7/ / 9/ / / / Kompong Cham hour rainfall at 7am (mm) / / hour rainfall at 7am (mm) 7/ / 9/ / / / Page MRC Weekly Flood Situation Report Week th nd June
11 Figure A: Water level and rainfall for Neak Luong, Prek Kdam, Tan Chau and Chau Doc Neak Luong Prek Kdam Tan Chau Chau Doc / / 7/ / 9/ / / / / / 7/ / 9/ / / / - / / 7/ / 9/ / / / - - Neak Luong Prek Kdam Tan Chau Chau Doc hour rainfall at 7am (mm) hour rainfall at 7am (mm) hour rainfall at 7am (mm) 7 / / 7/ / 9/ / / / / / 7/ / 9/ / / / / / 7/ / 9/ / / / / / 7/ / 9/ / / / / / 7/ / 9/ / / / - hour rainfall at 7am (mm) MRC Weekly Flood Situation Report Week th nd June Page
12 Annex B: Accuracy and performance Accuracy Accuracy describes the accuracy of the adjusted and published forecast, based on the results of the MRC Mekong Flood Forecasting System, which are then adjusted by the Flood Forecaster in Charge taking into consideration known biases in input data and his/her knowledge of the response of the model system and the hydrology of the Mekong River Basin. The information is presented as a graph below, showing the average flood forecasting accuracy along the Mekong mainstream. In general, the overall accuracy is fairly good for -day to -day forecast lead time at stations in the upper and middle parts of the LMB. However, the accuracies at upper part stations as Nong Khai, Vientiane, Neak Luong and two tidal affected stations Tan Chau, Chau Doc for -day and -day forecast were less than expected. The above differences due to two main factors: () internal model functionality in forecasting; for which the parameter adjustment in the model is not possible especially at stations in the upper part and in the Mekong delta where are affected by tidal; () the adjustment by utilizing the practical knowledge and experience of flood forecaster-in-charge. Figure B: Average flood forecast accuracy along the Mekong mainstream Page MRC Weekly Flood Situation Report Week th nd June
13 Forecast Achievement The forecast achievement indicates the % of days that the forecast at a particular station for a lead-time is successful against a respective benchmark (Table B). Table B: Achievement of daily forecast against benchmarks Unit in % Chiang Saen Luang Prabang Chiang Khan Vientiane Nongkhai Paksane Nakhon Phanom Thakhek Mukdahan Savannakhet Khong Chiam -day day day day day Pakse Stung Treng Kratie Kompong Cham Phnom Penh (Bassac) Phnom Penh Port Koh Khel Neak Luong Prek Kdam Tan Chau Chau Doc Average Table B: Benchmarks of success (Indicator of accuracy in mean absolute error) Unit in cm Chiang Saen Luang Prabang Chiang Khan Vientiane Nongkhai Paksane Nakhon Phanom Thakhek Mukdahan Savannakhet Khong Chiam -day -day -day -day 7 7 -day 7 7 Pakse Stung Treng Kratie Kompong Cham Phnom Penh (Bassac) Phnom Penh Port Koh Khel Neak Luong Prek Kdam Tan Chau Chau Doc Note: An indication of the accuracy given in the Table B is based on the performance of the forecast made in from the new flood forecasting system and the configuration for the 9 flood season and is published on the website of MRC ( A new set of performance indicators that is established by combining international standards and the specific circumstances in the Mekong River Basin, is applied officially for the flood season of onward. MRC Weekly Flood Situation Report Week th nd June Page
14 Performance Performance is assessed by evaluating a number of performance indicators, see table and graphs below: Table B: Overview of performance indicators for the past days including the current report date FF completed and sent (time) stations without forecast FF completed and sent (time) Weather information available (Number) NOAA data China Cambodia - DHRW Cambodia - DOM week : : - : 7: 7:7 7: :7 7: 7: 7 month :7 : - : 7: 7: 7: : 7: 7: season :7 : - : 7: 7: 7:7 : 7: 7: Lao PDR - DMH Thailand - DWR Viet Nam - NCHMF NOAA data China Cambodia - DHRW Cambodia - DOM Lao PDR - DMH Thailand - DWR Viet Nam - NCHMF Week is the week for which this report is made; Month is actually the last days (or less if the flood season has just begun); Season is the current flood season up to the date of this report. Time Data Delivery - Delivery Times : 9: 7: : : : / / 7/ / 9/ / / / Date Figure B: Data delivery times for the past days including the current report date NOAA China CAM DHRW CAM DOM LAO DMH THAI DWR VN NCHMF Page MRC Weekly Flood Situation Report Week th nd June
15 Number Data Delivery - Missing Data / / 7/ / 9/ / / / Date Figure B: Missing data for the past days including the current report date NOAA China CAM DHRW CAM DOM LAO DMH THAI DWR VN NCHMF Time : Flood Forecast - Completion Time Number Flood Forecast - Stations w ithout Forecast Time : Flood Forecast - Second Forecast Needed : : : : : : 9: / / 7/ / 9/ / / / / / 7/ / 9/ / / / 9: / / 7/ / 9/ / / / Date Date Date Figure B: Flood forecast completion time Figure B: Flood forecast stations without forecast Figure B: Second forecast needed MRC Weekly Flood Situation Report Week th nd June Page
16 Annex C: Season Water Level Graphs This Annex has the water level graphs of the report date. These graphs are distributed daily by together with the Flood Bulletins. HYDROGRAPHS OF THE MEKONG AT MAINSTREAM STATIONS IN FLOOD SEASON FROM JUNE TO OCTOBER Water Level at 7am of Mekong at Jing Hong -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Av9-99 Time in days Water Level at 7am of Mekong at Chiang Saen -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days 99 Water Level at 7am of Mekong at Luang Prabang -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days 99 Page MRC Weekly Flood Situation Report Week th nd June
17 Water Level at 7am of Mekong at Chiang Khan -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days 99 Water Level at 7am of Mekong at Vientiane -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99Time in days 99 Water Level at 7am of Mekong at Nong Khai -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days99 Water Level at 7am of Mekong at Paksane -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99Time in days 99 MRC Weekly Flood Situation Report Week th nd June Page 7
18 Water Level at 7am of Mekong at Nakhon Phanom -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99Time in days 99 Water Level at 7am of Mekong at Thakhek -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days 99 Water Level at 7am of Mekong at Savannakhet -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99Time in days 99 Water Level at 7am of Mekong at Mukdahan -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days 99 Page MRC Weekly Flood Situation Report Week th nd June
19 Water Level at 7am of Mekong at Khong Chiam -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days 99 Water Level at 7am of Mekong at Pakse -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99Time in days 99 Water Level at 7am of Mekong at Stung Treng -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days 99 Water Level at 7am of Mekong at Kratie -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99Time in days 99 MRC Weekly Flood Situation Report Week th nd June Page 9
20 Water Level at 7am of Mekong at Kampong Cham -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99Time in days 99 Water Level at 7am of Mekong at Phnom Penh Chaktomuk -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days99 Water Level at 7am of Tonle Sap at Phnom Penh Port -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days 99 9 Water Level at 7am of Bassac at Koh Khel 7 -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days99 Page MRC Weekly Flood Situation Report Week th nd June
21 9 Water Level at 7am of Mekong at Neak Luong 7 -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days99 Water Level at 7am of Tonle Sap at Prek Kdam -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days99 Water Level at 7am of Mekong at Tan Chau - -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days99 Water Level at 7am of Bassac at Chau Doc - -Jun -Jun -Jul -Jul -Jul -Aug -Aug -Sep 9-Sep -Oct 9-Oct -Nov Alarm Flood Av- 99 Time in days99 MRC Weekly Flood Situation Report Week th nd June Page
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