Rapid Increase In Water Levels Caused by Extremely High Rainfall From Tropical Storm Son-Tinh | Lao Tribune

Rapid Increase In Water Levels Caused by Extremely High Rainfall From Tropical Storm Son-Tinh

The Mekong River’s water levels have increased rapidly during the period of July 15 24, with a rise of over three meters in some stations along the mainstream. But they are not at the alarm level yet.

In the upstream part of the Lao PDR in Luang Prabang, water levels had risen from 8.97 m on Jul 18 to 13.32 m on Jul 23, a rise of slightly over four meters.

A sudden increase was detected at this motoring station, with a jump from 10.85 m to 13.28 m during Jul 21-22.

Water levels in Vientiane monitoring station also had increased from 4.64 m on Jul 18 to 9.40 m on Jul 23, representing an almost 5-m rise in five days.

Further downstream of the Lao PDR in Pakse, water levels increased by three meters, moving from 7.95 to 10.95 m over the same period.

In Nong Khai of Thailand, there was an increase of almost five meters, with water levels at the stations climbing from 5.58 m to 10.30 m over Tuesday’s monitoring period.

Slightly down the mainstream in Thailand, water levels in Nakhon Phanom station had plunged from six meters on Jul 15 to 9.88 m on Jul 24, indicating an almost 4-meter rise over 10 days.

At 10.30 AM today, the water levels in this station was recorded at 9.949 m, which is 1.5 m lower than the alarm level of 11.5 m and two meters below the flood level.

With this continued increase in water levels, Nakhon Phanom and Pakse water monitoring stations may expect to reach their alarm level, set at 12 meters, on Jul 27 and 29, respectively.

In Cambodia, three water monitoring stations in Stung Treng, Kratie and Kampong Cham all indicated an increase. Water levels in Stung Treng had risen from 7.68 m on Jul 18 to 9.25 m on Jul 25, while in Kratie, the water levels had jumped from 7.68 m to 9.25 m over the same period.

In Kampong Cham, there was an increase of slightly over two meters (10.51 m 12.56 m). These stations may reach their flood warning levels next week, when water levels in Stung Treng reach 12 m, in Kratie 23 m and in Kampong Cham 16.2 m.

The water monitoring stations in Viet Nam did not show any increase or worrying trend yet.

Analysis of the Mekong River Commission’s data reveals that the rapid rises of water levels are the results of extremely high level of rainfall from the upper part of Luang Prabang to Vientiane due to the tropical storm Son-Tinh. This caused a rapid rise in many tributaries of the Mekong and resulted in a rapid peak in the mainstream.

During the dry season the MRC’s Regional Flood Management and Mitigation Center (RFMMC) provides a weekly update on water levels monitoring for same key stations along the Mekong mainstream. Each member country of the MRC monitors water levels in the tributaries of the Mekong River in its own nation and has set different flood warning levels.

The Commission also conducts daily flood forecasting for key stations along the Mekong mainstream from Chiang Sean of Thailand to Tan Chau and Chua Doc of Viet Nam. It detects accumulated rainfall based on a flash flood guidance system to see which parts of the basin will experience possible flooding.

Source: Lao News Agency