Water quality studies of Semenyih Dam / Masyitah Binti Abdullah

Semenyih Dam is one of the Klang Valley major dams in Malaysia which is an
important water resource. Water Quality is important to study because they
help us to protect and know the quality of the water that is suitable for human
use. The objective of this study is to determine Water Quality Index (WQI),
bacteria and metal presence in Semenyih Dam. Water samples from four
sampling were sampled from July until August 2008. WQI was calculated
based on the six parameters which were Dissolved Oxygen (DO), Biochemical
Oxygen Demand (BOD), Chemical Oxygen Demand (COD), pH, Total
Suspended Solid (TSS) and Ammoniacal-Nitrogen. The findings show that the
Water Quality Index (WQI) is in class II. The Class II means that the water
needs general treatment to be used as drinking water resource. The amount of
bacteria contain in Semenyih Dam is lower than the amounts of standard that
are allowed which is 100 bacteria in 100 mL of water sample. The Dam is
contaminated with the presence of metal which are lead (Pb), cadmium (Cd)
and copper (Cu).