This report summarizes the results of a major R & D project commissioned by the NRA to develop and test components other than those for basic chemical and biological quality which already exist, to be incorporated in the General Quality Assessment schemes. GQA components based on nutrient concentrations and aesthetic quality were developed for rivers, canals, estuaries and coastal waters. For estuaries, a basic chemical assessment based on concentrations of dissolved oxygen and ammonia was developed. As a result of this research the NRA are now in a position to implement the nutrient and aesthetic components for rivers, canals, estuaries amd coastal waters, and also the basic chemical scheme for estuaries.
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