Acquisition of Representative Samples

The number of sampling sites, the frequency of measurements, and the quality parameters to be measured should be chosen. This requires knowledge of the sewer network, significant building activities, street cleaning practices, atmospheric pollution sources affecting the experimental sites, erosion patterns in surrounding natural areas, industrial activities, seasonal or climatic changes, etc., in order to avoid erroneous judgements in understanding the phenomena studied.

The experimental design must be in agreement with the study objectives (Geiger 1981, Gideometeozdat 1984a, Wong and Marsalek 1981). However, trial and error procedures should be used at the beginning of the study for a few basic parameters (for example, BOD, COD, TSS) at a few sampling sites. This information should be used when determining the experimental design.

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