ÖNORM EN ISO 9391

This International Standard provides guidance on the use of colonization Samplers and the sampling of macro-invertebrates using qualitative and quantitative Samplers for deep rivers. Colonization Samplers allow water quality to be assessed by providing a collection of macroinvertebrates indicative of the water quality at the sites of concern. They do not Sample the natura1 invertebrate fauna, which may be restricted by physical conditions unrelated to water quality. They are to be used when studying lowland river waters of depth over 1 m. They are not recommended when they could be subjected to debris accumulation, floods, exposure above the water level, vandalism or anchorage Problems. The deep water Samplers are for use in rivers deeper than 1 m and on substrata ranging from mud to stones. They are unsuitable when sampling over macrophytes or stones of sizes greater than about 15 cm, or in very fast flowing water.