This is the seventh consecutive year that Water Supplies Department has organised World Water Monitoring Day in Hong Kong. With a view to educating the public about water as a precious resource and encouraging the wise use of water, World Water Monitoring Day was held in conjunction with the Ceremony for Launching of Water Conservation Design Competition on 18 September 2010. 100 secondary school students from Semple Memorial Secondary School were invited to assemble at Tai Lam Chung Reservoir and carried out tests on the quality of water sampled on site.
The programme started with a clear demonstration by two chemists from Water Supplies Department regarding the test procedure. Students were then divided into small groups and each group was required to conduct three sampling tests by the use of a standard test kit. With the guidance of teachers and chemists, test results including temperature, acidity (pH), clarity (turbidity in JTU) and dissolved oxygen (DO in ppm) from each group were successfully submitted to our chemists for consolidation and analysis.
The test results showed that the surface water from Tai Lam Chung Reservoir reached the temperature of 34 ℃ high. The average values of pH and dissolved oxygen level of water were 7 and 8 ppm respectively while the turbidity stayed at 0 JTU in general. In conclusion, the quality of this raw water source was free from serious pollution.
Selected photos of the event are available in the Photo Gallery.