Abstract:
Water quality of a River is important as it is
used for drinking, domestic purpose and agriculture.
Hlaing River is one of the most important rivers in
Yangon Region. The River plays an important role to
supply water transportation for Hlaingtharyar, Insein
and Htantapin Townships. The objective of the paper
is to assess the change of water quality in Hlaing
River in the wet and dry seasons. The secondary data
used in the study are monthly mean temperature in
Yangon (Average) between 2007 and 2016 and
monthly rainfalls in Yangon (Average) between 2007
and 2016. Primary data are collected for sampling
points. 8 numbers of samples were collected at
different selective sampling points. A number of
physiochemical water quality parameters including
Biochemical Oxygen Demand (BOD), Chemical
Oxygen Demand (COD) and Total Suspended Solid
(TSS) are tested. Principal component analysis in
SPSS is used to know the correlations of the variables
and to determine how many important components
are present in the data. Sample points located at the
same river and nearer places are in same component.
According to the water quality surveys, the
water quality of Hlaing River met the level of Class
(III) of the Interim National Water Quality Standards of
Malaysia (for Water supply) in wet season because of
dilution process at that time and in dry season some
part of Hlaing River met the level of Class (IV) of the
Interim National Water Quality Standard of Malaysia
(for irrigation purpose).
