Nine hydrological stations have been selected, based on an analysis of hydro-geographic reaches, to provide the basis for implementing the PMFM in the mainstream.
A further three, Phnom Penh Port, Prek Kdam and Kampong Luong stations are located on the Tonle Sap River/Lake and have been selected for monitoring the natural reverse flow of the Tonle Sap.
The main features and locations of the selected 12 hydrological stations are provided in Table and Figure below.
| No | Station | Country | Drainage and Zero gauge* | Observed data used | Hydro-geographical features |
|---|---|---|---|---|---|
| 1 |
Chiang Saen
(Mekong River) |
Thailand |
189,000 km2
357.11 m msl |
1962-2009 | Recognised as transboundary station |
| 2 |
Vientiane
(Mekong River) |
Lao PDR |
299,000 km2
158.04 m msl |
1962-2009 | Key station above the Nam Ngum confluence |
| 3 |
Khong Chiam
(Mekong River) |
Thailand |
419,000 km2
89.03 m msl |
1967-2009 | Upstream of Kong-Chi-Mun confluence |
| 4 |
Pakse
(Mekong River) |
Lao PDR |
545,000 km2
86.49 m msl |
1962-2009 | Downstream of Kong-Chi-Mun confluence |
| 5 |
Stung Treng
(Mekong River) |
Cambodia |
635,000 km2
36.79 m msl |
1962-2009 | Transboundary flow monitoring for Lao PDR and Cambodia |
| 6 |
Kratie
(Mekong River) |
Cambodia |
646,000 km2
-1.08 m msl |
1962-2009 | Key station for Article 6B |
| 7 |
Chrouy Changvar
(Mekong River) |
Cambodia |
663,000 km2
-1.08 m msl |
1969-2008 | Key station for Cambodia floodplain |
| 8 |
Phnom Penh Port
(Tonle Sap River) |
Cambodia |
-
0.07 m msl |
1997-2009 | Key station for Article 6B |
| 9 |
Prek Kdam
(Tonle Sap River) |
Cambodia |
-
0.08 m msl |
1997-2009 | Key station for Article 6B |
| 10 |
Kampong Luong
(Tonle Sap Lake) |
Cambodia |
km2
0.64 m msl |
1997-2009 | Key station for Article 6B |
| 11 |
Tan Chau
(Mekong River) |
Viet Nam |
760,000 km2
0 m msl |
1981-2009 | Transboundary flow monitoring for Cambodia and Viet Nam |
| 12 |
Chau Doc
(Bassac River) |
Viet Nam |
760,000 km2
0 m msl |
1981-2009 | Transboundary flow monitoring for Cambodia and Viet Nam |
| * Zero gauge above the mean sea level (msl) with different national datum (Hatien for Cambodia and Lao PDR, Hondau for Viet Nam, and Kolak for Thailand). | |||||
