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Field Investigation of Groundwater Quality in Bangkok
Magatt Thiam 
D2, Environmental & Agricultural Engineering Department, United Graduate School of Agriculture
Destination and period: Bangkok, 2013 / November, 25-29
Key words: Aquifer, Seawater, Environment, water quality, EC
Abstract
Between 2013/11/25 and 2013/11/29 we have conducted a field training in Bangkok, Thailand. The objective was to investigate one aspect of the groundwater of the aquifer complex in Bangkok. In situ measurements of electro-conductivity (EC) and temperature were done from 14 locations (of monitoring wells). These measurements targeted 3 superposed aquifers identified by the code names, from top to bottom, by PD, NL and NB. Salinity maps constructed from the measured EC values showed that the aquifer NB has the best water quality (salinity mostly lower than 0.9 g/L); while the shallowest aquifer (PD) displayed a lower water quality compared to others,(more than 2.05 g/L as salinity value on the investigated area). Aquifer NL, intercalated between the 2 mentioned above, has lower quality than NB (located below it) but seems have a better water quality than the aquifer PD (located above it). However this aquifer NL has salinity value often greater than 1.0 g/L. This shows that the deeper the aquifer the better is its water quality. It also indicated that the groundwater depletion occurred in the shallowest aquifer and that the seawater intrusion started to take place as if it was submerging the underlying aquifers.