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Weekly Wet Season Situation Report in the Lower Mekong River Basin - 09 - 15 August 2022

Pays
Cambodge
+ 3
Sources
MRC
Date de publication
Origine
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Key Messages

Key messages for this weekly report are presented below:

Rainfall and its forecast

  • Rainfall focused in the areas from Chiang Saen in Thailand to Tan Chau and Chau Doc in Viet Nam, including the upper, middle and lower parts in Lao PDR and Cambodia, varying from 1.10 millimetres (mm) to 185.40 mm.

  • There will be above-average rainfalls for the next 5 days over the Mekong region from 16 to 20 August 2022 because there will be a low pressure dominating the Mekong region.

Water level and its forecast

  • According to MRC’s observed water level at Jinghong, it showed an increased WL of about 0.09 m from 5355.36 m to 535.45 m between 09 and 15 August 2022. The current level is staying about 0.36 m lower than its LTA (2015-2021) value. The outflow at Jinghong station decreased from 899.00 m3 /s to 954.00 m3 /s from 09 to 15 August 2022.

  • With the increased outflow from Jinghong upstream and heavy rainfall at catchment inflow, water levels of monitoring stations at Chiang Saen in Thailand increased about 1.99 m from 09 to 15 August 2022, still staying about 0.34 m lower than its LTA level, which is considered normal.

  • Moreover, water level at Chiang Khan in Thailand from 09 to 15 August 2022 increased about 3.00 m and stayed close to its LTA value, while water level at Vientiane also increased about 2.83 m and stayed about 0.62 m higher than its LTA level, which considered normal. Water levels at Nong Khai increased 2.76 m and at Paksane increased about 2.04 m, staying about 0.33 m and 1.13 m lower than their LTA value respectively, considered critical.

  • Water levels from Nakhon Phanom in Thailand and Pakse in Lao PDR increased between 0.30 m and 0.78 m. The current WLs at these stations are staying about 1.00 m and 2.30 m lower than their LTA level, considering critical. From the stretches of the river at Stung Treng water level increased 0.35 m and stayed about 1.16 m lower than its LTA, while at Kratie water level increased 2.02 m, staying 0.56 m lower than its LTA level, which still considered critical.

  • Water levels from Kompong Cham down to Chaktomuk, Koh Khel and Phnom Penh Port to Prek Kdam in Cambodia increased between 1.20 m and 2.35 m, but still staying between 0.80 m and 2.20 m lower than their LTA level, considering critical.

  • The current water levels for most of the stations are lower than their LTA value. WLs at the 2 tidal stations at Tan Chau and Chau Doc were above their LTA value due to tidal effect during this monitoring period.

  • Over the next five days, the water levels at the upper and middle parts from Chiang Khan to Pakse are expected to go up but those in downstream from Kratie to Neak Luong and Koh Khem will go down. Water levels at these stations are stillstaying lower than their long-term average value.

Drought condition and its forecast

  • During August 7-13, there were some moderate meteorological droughts in the north of the LMB covering Phongsaly, Luangnamtha, Lao Cai, Xieng Khuang, Xaysomboun, Borikhamxay, Khammuane, and Nong Khai. In general, the LMB was still considered normal and did not face any serious drought threat.

  • During the next three months, August is likely to be severely and extremely dry, specifically in the southern part and the 3S area of the LMB covering some areas of Thailand, southern Lao PDR, and half-eastern Cambodia; September is likely to be severely dry in the lower part covering around 50% of Cambodia, Vientiane province of Lao PDR in the north, and Ca Mau, Bac Lieu, and Kien Giang of the Mekong Delta of Veit Nam; while October is forecasted to be normal and wet all over the region.