Abstract
Abstract Swimming and fish habitat are two of the beneficial uses identified by the Hamilton Harbour Remedial Action Plan. Both uses require improvements in the Harbourșs water clarity. Beginning in 1988, the addition of a pickle liquor step at the Hamilton Sewage Treatment Plant (STP) successfully reduced the total phosphorus loading into the Harbour from 515 kg.day−1 to 364 kg.day−1 in 1990. A comparison of the 1987 and 89/90 Harbour data showed that chlorophyll decreased 15 μg.L−1 and seston decreased 2.8 mg.L−1, which improved Secchi disc transparency 42 cm from 148 cm to a two year summer average of 190 cm. Secchi disc transparencies in the 3 metre range appear to be attainable when chlorophyll concentrations are below 7 μ/tg.L−1.
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