Thailand current water situation

June 20, 2022
Sutiwat Prutthiprasert
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Thailand Current Water Situation

Summary

  • The rainfall amount from the end of May is substantially higher than last year, especially in the south.
  • In the first half of June, there will be heavy rain in many areas, especially eastern and southwest regions.
  • In the second half of June, rain will decrease due to weakening of the southwest monsoon.
  • The storage levels in all major dams of the Chao Phraya Basin are slightly higher than the beginning of May due to arriving of rainy season. And, the storage levels are mostly relatively higher than last year.
  • The river levels of Yom river (upper Chao Phraya River) are clearly higher than the beginning of May. However, the overall river levels of both upper and lower Chao Phraya River are still normal to low. There is no concern about flood. 

Precipitation

The precipitation until the end of May comparing to last year is substantially higher, especially in the south of country. The accumulated rainfall in overall country is in the range of 200-1200 mm which is the effect from La Nina. If comparing to the average rainfall value, this year’s accumulated rainfall is significantly higher, especially in the northern and southern regions.

Forecast

According to the monthly weather forecast from the Thai Meteorological Department change to, the weather will be continually rainy in the first half of June, approximately 40-60 percent of the area, there will be heavy rain on some days in some areas. For the eastern and southwest regions, rain will increase to be approximately 60-80 percent of the area, there will be rain in many areas and be heavy rain in some areas. Afterwards, the quantity and dispersion of rainfall will decrease in the second half of the month. These are the consequence of the transition from weakening of the southwest monsoon that covered the country in the first half of the month. In addition, there will be monsoon trough that will periodically lay along the northern and northeast regions. And, the monsoon trough will lay along the southern region of China in the second half of the month.

For the precipitation forecast in June, the total rainfall of upper country will be approximate to the normal value while the total rainfall of southern region will be approximately 10 percent lower the normal value.

Caution in June, there will be tropical storms usually formed in the western region of North Pacific Ocean, and moved thru the Philippines into the South China Sea. Thus, the southwest monsoon that has covered the Andaman sea and the country will be stronger, as a result, rain will be increased, especially southwest region and eastern region coasts.

Note: Normal value is the average rainfall amount within the period of 30 years (1981-2010)

Dam Storage Level (Sirikit Dam, Bhumibol Dam)

Storage level Sirikit Dam (39%) 29 May 2022

Storage level Bhumibol Dam (45%) 29 May 2022

The storage level of Sirikit Dam until May 29th is slightly higher than last year although the storage level at the beginning of the year is low. For Bhumibol Dam, the storage level is increasing as a consequence of higher rainfall in the northern region and is in the different trend comparing to last year.

Dam Storage Level (Pasak Dam, Kwaenoi Dam

Storage level Pasak Dam (30%) 29 May 2022

Storage level Kwaenoi Dam (38%) 29 May 2022

The storage levels of both Kwaenoi Dam and Pasak Dam comparing to the beginning of the year are substantially lower. However, the storage levels are slightly higher than the last year.

 The Upper Chao Phraya River Flow

The river level in Yom river is higher from the beginning of May, especially the river level at Phichit province. For, the river levels in Ping, Wang, and Nan river are not significantly changed from the beginning of May. The river level of the Chao Phraya River above the Chao Phraya Dam is also lower than the bank. Thus, there is no critical situation regarding flood event.

Water Situation in the Chao Phraya River

29th May 2022

Note: – Numbers in bracket indicate the flow rate of water in m3/sec.

– Numbers with underline indicate higher (+) or lower (-) of water level than the river bank in meters.

– Water levels U/S and D/S are in meters.

The Lower Chao Phraya River Flow

               There is no significant change of river levels in the Lower Chao Phraya. The river level is clearly lower than the river bank. There is no notable situation.

Water Situation in the Chao Phraya River

29th May 2022

Note: – Numbers in black indicate the flow rate of water in m3/sec.

– Numbers in bracket the flow rate of water in m3/day.

– Numbers with underline indicate higher (+) or lower (-) of water level than the river bank in meters.

References
http://www.arcims.tmd.go.th/dailydata/yearRain.php
https://www.tmd.go.th/monthly_forecast.php
https://www.thaiwater.net/water/dam/large
http://water.rid.go.th/flood/plan_new/chaophaya/Chao_up.php?cal2=29052022
http://water.rid.go.th/flood/plan_new/chaophaya/Chao_low.php?cal2=29052022
https://www.pexels.com/photo/silhouette-of-house-and-trees-by-water-during-golden-hour-1044330/

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AUTHOR

Sutiwat Prutthiprasert