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Trends in lake rotorua new zealand water quality


, : Trends in lake rotorua new zealand water quality. New Zealand Journal of Marine & Freshwater Research 18(3): 355-366

Fourteen determinands relating to the water quality of Lake Rotorua were examined for trend over the period 1966-1983. A linear regression package was used, but additional manipulations were performed to eliminate markedly non-normal distributions, remove seasonality, compute monthly averages, fill gaps, and correct for serial correlation. Since lake data came from 3 different organizations, with possibly different analytical techniques, trends were calculated over 3 periods separately. Lake quality deteriorated during 1967-1970 largely because meteorological conditions favored lake stratification. During 1978-1983, despite favorable meteorological conditions, quality again deteriorated at the same time as, and probably as a result of, an increase of available nutrient input from sewage effluent. Improved sewage nutrient removal could halt this deterioration.

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