Ribble SIMCAT Pilot Study - Assessment of Relative Contributions and the Impact of Control Measures on Water Quality
ISBN: 1 84057 489 5
The Water Industry identified an urgent need to quantify the water quality benefits of Programme of Measures (PoMs) applied to Water Industry discharges at 'end of pipe' and other, more diffuse, sources of pollution. This project was established to identify both the most cost effective ways to reduce both point and diffuse source nutrient/metal loadings to a water body and to identify how they compare in terms of costs and benefits. The study addressed the following objectives: quantifying pollution loads from point and diffuse inputs to the catchment from water company discharges, agricultural and urban runoff; developing and calibrating a SIMCAT model of the Ribble Catchment for BOD, Ammonia, Phosphate, TON and Copper based on the identified pollution loads; and, assessing the water qualtiy benefits that would arise from a range of individual and in-combination PoMs scenarios for both point source and diffuse pollution control.
The study used a SIMCAT model to demonstrate how observed data for rivers and effluents plus inputs for urban and non-urban diffuse loads generated by other modelling approaches can be used to assess the apportionment of pollution from different sources across a catchment. The results from the study have been provided to DEFRA and used in the preliminary Cost Effectiveness Analysis for England and Wales. In many respects the issues facing the Ribble Catchment are not atypical of other large catchments in England and Wales. The approach developed in carrying out the Ribble Catchment study can be transferred to other catchments.
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