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The study on impacts of various land uses namely forested watershed (at Wang Takhrai),
forrested-agricultural watershed (Klong Si Yat and Klong Pra Satung), upland agricultural
watershed (Klong Phra Phrong and Klong Maiseab), lowland watershed (Klong Nong Keo and
Klong Bang Pai) Nakhon Nayok, Prachinburi and Bangpakong river basins in relations to the
concentrations of calcium, magnesium, sodium, potassium, carbonate, bicarbonate, chloride,
sulphate, nitrogen and phosphorus were conducted during August 1984 to April 1985. The
results indicated that Bangkok watershed contained highest concentration of calcium,
magnesium, sodium, potassium chloride and sulphate at 8.68 ,31.59 ,88.07 1.95 ,101.16 and
20.49 mg/l respectively. Less difference was observed on carbonate ,bicarbonate, nitrogen
and phosphorus concentrations among various land uses watershed.
- The nutrient concentration observed in Bangkok river basin were relatively high
especially sodium and chloride but they were lower than the WHO drinking water standard.
Forested watershed gives the lowest nutrient concentration compared to others. However, it
can be summarized that water in Bangkok river basin are in natural water quality standard.
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