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Current Defra policy on river catchment management has been informed by our interdisciplinary research over a 10-year period, much of it addressing the challenges posed by the EU Water Framework Directive. Outcomes from our research are reflected in the policies proposed in the 2011 Water for Life White Paper and also in the multi-million pound investment plans of water companies. We have also influenced a whole-community framework for catchment management in the UK that was piloted in 2011 and has now been extended to 100 catchments across England.
Water is essential to society. The water industry constitutes a significant part of economic activity locally, nationally and internationally, and land and water management are crucial to environmental quality. Typically, water resources are governed by top-down, hierarchical approaches at state level. In contrast, the research of Professor Laurence Smith has demonstrated the success of approaches that privilege local stakeholder input and collaborative management at catchment level. Research outputs have contributed to improved and reformed water management in the UK and internationally, evidenced by their adoption by local authorities, NGOs, Defra and others, and promotion in the guidance proffered by organisations including Defra and the OECD.
Research into the characteristics and remediation of mining pollution has had sustained and significant impacts (2008 - 2013) on environmental policy and practice at regional, national and international scales. Impacts, all with documentary evidence, include:
The intensification of food production, fossil fuel combustion and water consumption has led to substantial increases in the amount of nitrogen and phosphorus flushed from land to water. The accumulation of these nutrients in freshwaters, estuaries and the coastal zone has led to reductions in biodiversity, the loss of ecosystem services, and compromised water security. The UK is a signatory to a raft of international conventions and policies which require reductions in the flux of nutrients from land to the water and restoration of ecosystem health and services. To meet these obligations, policymakers need information on the scale of the problem, the sources of nutrients and the effectiveness of intervention measures.
Research in the Unit has directly addressed this need. It has provided robust scientific evidence of the scale of the problem and the sources of nutrient enrichment, and has provided the capability to test intervention and policy scenarios at field to national scales. It has fed directly into the development of monitoring approaches and mitigation measures now in use by the Environment Agency (EA) and Defra, informed the development of UK Government policy in relation to catchment management, and supported compliance with the EU Water Framework Directive, the renegotiation of the Gothenburg Protocol under the International Convention on Long-Range Transboundary Air Pollution, and reporting on discharges of nutrient pollution to the North East Atlantic under the OSPAR Convention.
Exeter Engineering's Centre for Water Systems (CWS) undertakes internationally leading fundamental and applied research in the $500bn global water sector. EPSRC-funded research has underpinned impacts with both reach and significance in the areas of practitioner and professional services and economic impact. CWS staff have co-authored authoritative best practice guides with highly respected practitioner publishers: the Construction Industry Research and Information Association (CIRIA), the Building Research Establishment (BRE) and Spon Press. These have been widely used in the water sector, and construction and built environment sector. CWS software and knowhow have been used extensively by water service providers (such as Scottish Water) and their consultants (including SEAMS, originally an Exeter spinout) to enhance business performance by identifying efficiencies, saving costs and improving operation. Optimisation software has been made freely available and has hundreds of users worldwide including consultants and financial organisations.
Research, undertaken at the University of Sheffield since 2001, into the discolouration of drinking water occurring within distribution systems has had economic, policy and professional practice impacts on the water supply sector since 2008. This has resulted in improved levels of service, has safeguarded water quality delivered to the public and has delivered substantial economic savings. For example, in one of the few cases where monetary value is available, Wessex Water made 63% savings on two trunk main schemes with an initial estimated cost in excess of £1M. The 4 and 7 km lengths of these trunk mains represent less than 1% of the trunk mains being impacted by our research. Our research has resulted in a step change in the concept and approach to the management of discolouration in water distribution systems.
New characterisation tools for natural organic matter (NOM) in drinking water are now used as standard practice within water companies such as Severn Trent Water, United Utilities and Yorkshire Water. The tools inform decisions, and help develop strategic plans on catchment management, source selection, treatment optimisation, and disinfection practice. Water companies experienced difficulties in treating high levels of NOM. Cranfield created a novel characterisation toolkit to measure NOM for its electrical charge and hydrophobicity. Also, new techniques for measuring aggregate properties and emerging disinfection by-products have provided a comprehensive analysis. Two novel treatment technologies are currently marketed. These technologies have raised international interest, resulting in industrial development in Australia.
Research at Newcastle University into stochastic rainfall models and their application has transformed the practice of impact assessment of climate change and risk assessment of environmental hazards across multiple sectors. The Newcastle methods underpin the "Weather Generator", a web-based tool which has been made available since 2009 by DEFRA as part of their official UK Climate Projections (UKCP09). The tool's incorporation into this official data source means that the models generated underpin multi-sectoral risk assessment throughout the UK and subsequently have led to the adoption of stochastic methods in general, particularly in the water and insurance industries to produce more robust risk assessments.
Surface water runoff in urban areas makes a significant contribution to pollution of lakes and rivers, but historically is poorly addressed in catchment models. The School of Geography (SoG) developed a Geographic Information System (GIS) model and supporting database to quantify urban source area loadings of 18 common and priority pollutants. This knowledge improves catchment models and supports impact assessment and mitigation planning by environment managers. The research has been exploited on behalf of the Department for Energy, Food and Rural Affairs (DEFRA), the Welsh Assembly, and the UK water industry (UK Water Industry Research — UKWIR, and United Utilities). The research has had three distinct impacts: 1) its use addressing EU Water Framework Directive obligations; 2) its on-going influence on construction industry guidance; and 3) the commercialisation of its stormwater pollutant coefficient database for Sustainable Urban Drainage Systems (SUDS) planning software.
Science has guided national dryland policy in Africa through approaches that have omitted local knowledge, and has informed international policy through implementation of the United Nations Convention to Combat Desertification (UNCCD), previously developed by a Roster of Experts. Our national and district-level research in Botswana has identified routes to increase community involvement in degradation monitoring, and our strategies have been rolled out nationally via agricultural extension workers, allowing knowledge to inform farming practices and land policy. Our analysis of the wider international context has led us to propose new science-to-policy pathways that have allowed the UNCCD to draw more effectively upon both local and scientific evidence.