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Harmonised monitoring scheme : ウィキペディア英語版 | Harmonised monitoring scheme The Harmonised monitoring scheme is a long term river water quality monitoring scheme in the United Kingdom.〔(DEFRA - Freshwater quality - Harmonised Monitoring Scheme )〕 The term is also used to refer to the long term data sets produced by the scheme. ==Establishment==
The scheme was established in 1974 by the Department of the Environment with much of the initial planning and implementation undertaken by the Water Research Centre. It involved the creation of a network of sites across the UK. Most sites were at the downstream freshwater limits of the larger rivers although some of the largest rivers also included additional locations below major tributary confluences. Before inclusion of any location in the survey, homogeneity testing was carried out to characterise quality variations laterally and vertically within the river section chosen. For each designated point a specific sampling location was identified based on the results of the homogeneity exercise. In addition laboratories who were to undertake the analysis of samples were identified and a comprehensive AQC exercise was conducted to ensure comparability of data derived from the monitoring programme.〔(Analytical Quality Control in the Harmonised Monitoring Scheme )〕
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