Abstract:
Rivers are important for mankind. They provide water for economic development and
human consumption; they provide recreational facilities; they support a large variety of
wildlife and they are part of our natural scenic heritage. Industrial development,
improvements in living standards and change in agricultural practice have resulted in an
increased demand for good quality water. However, such developments have produced
increased amount of sewage, industrial wastewater, agricultural discharge and
agricultural runoff. The rivers that flow through almost all of the world’s cities shown an
appreciable decline in water quality but these are often difficult to specify the exact
cause of the deterioration.
Khulna division is situated in the south western part of Bangladesh, its area is about
22274 sq.km and the population is about 14.47 million. It has 10 districts and 28
municipalities in Khulna division. Khulna Formed with the silted alluvial soil. This
division is fertile and produces a lot of coconut, paddy, jute, betel leaf, sugarcane,
potato, turmeric, oil seeds, mulberry plant, vegetables, mango, jackfruit, banana, litchi,
berry, palm and papaya. The world biggest mangrove forest is found in Sundarban.
Khulna is also known as the city of Shrimps, because 75% of all shrimps exported from
Bangladesh are cultivated in the Khulna zone.
This study was conducted depending on secondary data of some extensive laboratory
tests which were performed by to DoE to determine the physical and chemical of some
selected rivers (Bhairab , Kakshially, Garai, Rupsha, Poshur, Mouri, Mamundo,
Kopotakha, Mathavanga) in Southern region of Bangladesh. The river water was found
to be highly turbid and higher loading of BOD and COD in both Pre-monsoon and
Monsoon period. This indicates that the bacteriological pollution load as compared to
flow was very high in the both season. Also the pollutant load in downstream of the river
and far away from the place of the major activities of the conveyor, were less. At the
same time source of pollution were identified for the surrounding area.
