| dc.description.abstract | The study was conducted in the Department of Civil Engineering at Sonargaon University with
the objectives to prepare a project and thesis with a view to partial fulfillment of the
requirements for the degree of Bachelor of Science (B.Sc.) in Civil Engineering. The specific
objective of the study was to study the surrounding environment at a few selected sites around
Hatirjheel Lake, to assess the lake's water quality in terms of very important water quality
parameters, to investigate the causes leading to it. This serious water pollution and finally to
provide some suggestions to improve the existing condition. To determine the suitable
locations of water collection, the whole area in and around the lake was preliminarily surveyed
and necessary photographs were taken. Then water samples were collected such that the
samples represent the characteristics of lake water. With a view to finding out the water quality
some parameters water samples were tested at field and several data was tested DPHE central
laboratory. We get pH scale varied from 7.5 to 8.0. with a weighted average of 7.75 that’s
samples 100% maintain the quality (ECR.97) and World Health Organization guideline. The
Dissolve Oxygen of the Lake water has shown a variation from 4.75 to 6.05 mg/l. with a
weighted average of 4.06 the study value not exceeded the minimum requirement so the water
was not good for drinking. BOD varied from 15mg/l to 32 mg/l with a weighted average of
23.33 mg/l, 100% samples showed deviation from the standard. COD varied from 60 to 120
mg/l with a weighted average of 88.67 mg/l, which is so far from the BECR standard and WHO
guideline. Electrical Conductivity of water of the Hatirjeel lake was found to vary from 550 to
740 (micro mhos/cm) and the average value was 616.33 (micro mhos/cm). According to WHO
guideline and BECR standard electrical conductivity value should not exceeded 1000 μs/cm so
the water 100% maintain the quality. The Total Dissolved Solid of water of the Hatirjheel lake
was found in a range of 275 mg/l to 370 mg/l with a weighted average of 308.50 mg/l. Hence,
the range was acceptable and concentration of TDS is not harmful. And Hardness varied from
153 to 171 mg/l as CaCO3 and a weighted average 163.00 mg/l. Hence WHO guideline and
BECR standards the hardness value was low. This helps to assess the need to prevent water
and pollution of Hatirjheel Lake | en_US |
