Abstract
Abstract In the United Kingdom, the need to monitor the quality of all but the smallest rivers as they enter tidal waters has been established. There is a need both to satisfy international obligations, and to provide information on river quality. To satisfy this need, the Harmonized Monitoring Scheme was set up. A network of sampling points has been established which will allow all important rivers to be sampled at or a little above the tidal limit. A similar network has been established for major tributaries with the sampling points being at the confluence or a little way up the tributary from it. Nearly all sampling points are associated with flow gauging facilities so that load as well as concentration can be determined. The scheme lays great stress on the need to produce results of adequate accuracy. To ensure that such accuracy is maintained, the Harmonized Monitoring Scheme includes a continuing inter-laboratory calibration of participating laboratories.
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