This second edition of a highly successful guide has been completely updated to take in the latest developments in strategies and methodologies. It gives comprehensive and practical advice on designing and setting up monitoring programmes to obtain valid data for water quality assessment in all types of freshwater bodies. Water Quality Assessments provides key information for all agencies and individuals responsible for water quality; is an essential aid for anyone involved in setting up a water quality assessment programme, or in studying the subject as part of their course; addresses the key recommendations of Agenda 21 of the United Nations Conference on Environmental and Development.