Deposition Input Considerations

In any catchment acidity mitigation programme it is essential to understand and quantify the hydrological and biogeochemical processes of the catchment. Quantitative and qualitative measurements of deposition or atmospheric inputs to a catchment are thus important. Catchment hydrological and hydrochemical models (see Chapter 6) require deposition input data and, in association with a complementary programme of stream water or runoff measurement and ionic analysis, measurement of deposition inputs provides data for the calculation of hydrochemical input/output budgets or fluxes. The importance of these are explained and demonstrated in Chapters 12 and 16.