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Example text
If there are rapids or waterfalls in the river, the mixing will be speeded up and representative samples may be obtained downstream. Sampling for the determination of dissolved oxygen, however, should take place upstream of the rapids or waterfall because the turbulence will cause the water to be saturated with oxygen. In such a case, several samples should be taken across the width of the river to allow for the possibility of incomplete mixing. A bridge is an excellent place at which to establish a sampling station (provided that it is located at a sampling site on the river).
2). The flow pattern, or regime, of any particular river will be the product of very specific conditions. Although similar to that of rivers in the surrounding geographical region, it will be extensively influenced by altitude, exposure of the slope to wind and variations in rainfall. Further details of the natural factors and influences on water quality in rivers, lakes, reservoirs and groundwaters are given in the special chapters on each of these water bodies in the companion guidebook Water Quality Assessments.
Water quality monitoring and assessment can be conducted from a number of different perspectives which may combine the following goals in different ways: • Uses of water. Does water meet user requirements for quantity and quality? (For example, with respect to meeting use-defined standards. ) • Influences on water quality from direct use or from other human activities or natural processes. What are these influences? g. water as a medium for pollutant transport and exposure). • Control and regulation of water quality.
