Understanding the hydrological system is a critical importance towards the complehension of the functionality of the lagoon system. The IMOLA Project conducted a pilot survey of hydrological system in the Sam Chuon Lagoon in September 2007.

The survey was undertaken at five stations (four transects) for five days, measuring tidal level, depth, velocity, and water direction as main indicators, as well as salinity, pH, and temperature as additional indicators, following the methodology prescribed by the Marine Hydroteorological Centre-Vietnam (1981).

In relation to this survey, the water was also sampled and tested in concentrated aquaculture areas in the Sam Chuon Lagoon. 8 monitoring points are located in the areas of high aquaculture concentration, namely the Quang An and Quang Thanh areas (3 points) and the lagoon area under Thuan An, Phu An, Phu My, and Phu Xuan (5 points) (see also Water and Sediment Survey).