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Tuesday, January 30, 1973
STUDIES OF SEWAGE DISCHARGE
Pollution Survey Ship Employed
A pollution survey ship is being used by the Government for carrying
out studies of sewage discharge into Hong Kong waters.
Mr. Tin Yuen-kwan, Engineer of the Drainage Works Division, Public
Works Department, said that the studies involved the observation of current
strength and direction, the measurement of water quality at fixed stations
and "float following" observation.
The last exercise takes the form of tracing the path of a float
released at selected stages of the tide at a particular location.
The ship is also used in sampling water at various beaches, and in
routine monitoring of water in Victoria Harbour, Tolo Harbour and Castle
Peak Bay, as recommended by the Consultant Engineers in their report on Marine
Investigation into Sewage Discharges.
Mr. Tin said that the ship, "Chop Yat", ie equipped with a small
laboratory so that some of the water samples collected can be processed as
soon as possible for the purpose of analysis.
"Other samples are tested in the Drainage Works Division Laboratory
in Farm Road Government Branch Offices," he added,
"The interpretation of the information collected will indicate the
dispersion and dilution of sewage discharges and guide us in the planning of
possible locations and designs of sewer outfalls and treatment facilities,"
Mr. Tin said.
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