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Weekly Wet Season Situation Report in the Lower Mekong River Basin – 8 – 14 June 2022

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 middle and lower parts in Lao PDR and Cambodia, varying from 1.60 millimetres (mm) to 86.10 mm.


There will be average rainfalls for the next 5 days over the Mekong region from 15 to 22 June 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 a significant decrease of about 1.35 m from 537.81 m to 536.69 m from 08 to 14 June 2022, staying about 0.08 m higher than its Long-Term-Average (2015-2021) value. The outflow at Jinghong station decreased from 2810.00 m3 /s to 1830.00 m3 /s from 08 to 14 June 2022.


Water levels of monitoring station at Chiang Saen in Thailand decreased about 0.08 m from 08 to 14 June 2022, but still stayed about 0.46 m higher than its LTA level, which is considered normal.


Water level (WL) from Chiang Khan in Thailand from 08 to 14 June 2022 increased by about 0.46 m (about 2.08 m higher than its LTA value), while water level at Vientiane increased about 0.14 m and still stayed about 2.21 m higher than its LTA level, which considered normal. Water levels at Nong Khai decreased 0.04 m and at Paksane decreased about 0.44 m, staying about 1.12 m and 0.24 m higher than their LTA value, respectively.


Water levels from Nakhon Phanom in Thailand and Pakse in Lao PDR decreased between 0.15 m and 0.50 m. The current WLs at these stations were staying higher than their LTA value, considered normal. From the stretches of the river from Stung Treng to Kratie it decreased about 0.26 m and 0.57 m, staying 0.72 m and 1.61 m higher than their LTA level, respectively.


Water levels from Kompong Cham down to Chaktomuk, Koh Khel and Phnom Penh Port to Prek Kdam in Cambodia decreased about 0.05 m and 0.50 m, staying between 0.20m and 0.85 m higher than their LTA level.


The current water levels from Chiang Saen in Thailand to Kompong Cham in Cambodia are higher than their LTA value. WL at the 2 tidal stations at Tan Chau and Chau Doc are above their LTA value due to tidal effect during this monitoring period.


Over the next five days, the water levels across most monitoring stations are expected to go up and stay higher than their long-term average value in most stations.


Drought condition and its forecast


During June 5-11, the LMB was facing some moderate and severe meteorological droughts in the north covering Chiang Rai, Xayaburi, Vientiane province, Vientiane Capital, Nong Khai, and Loei and moderate drought in the south covering Si Saket, Surin, Chanthaburi, Battambang, Stung Treng, Kampong Cham, Kandal, and Tay Ninh. However, no significant agricultural drought threat was found during the monitoring week.


For the upcoming three months’ forecasts, the LMB is likely to receive below-average rainfall in July and August with equivalent from moderate to severe meteorological droughts. Below-average rainfall is also forecasted for the lower part of the region covering Cambodia and Viet Nam during this coming September with moderate drought. While in October and November the LMB is likely to receive more than average rainfall, meaning no drought threat is predicted for the LMB.


Source: Mekong River Commission