Water quality. Guidance on pro-rata Multi-Habitat sampling of benthic macro-invertebrates from wadeable rivers Ingestion-build-81500 The physical medium over which

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Water quality. Guidance on pro-rata Multi-Habitat sampling of benthic macro-invertebrates from wadeable rivers Ingestion-build-81500 The physical medium over which1 Scope This European Standard gives guidance on procedures for the pro rata Multi Habitat Sampling (MHS) of benthic macro invertebrates in wadeable rivers and streams. The term "pro rata" reflects the intention to sample adequate proportions of riverine habitats with reference to their percentage occurrence. The pro rata MHS technique does not replace other techniques, but is rather, alongside other applications, a fundamental requisite of some multi