Rural sustainable drainage systems:a practical design and build guide for Scotland's farmers and landowners

Soil cultivation, manure / fertiliser applications and chemical spraying can all contribute to diffuse pollution from agricultural land. Rainfall runoff from farm roads, tracks, yards and dusty roofs are also potential sources of diffuse pollution. Whilst many changes in farming practice have dealt with these sources of pollution there still remains instances where small amounts escape from a farmyard into a nearby ditch or where sediment laden overland field flows make their way into a ditch or burn, river or natural wetland and finally the sea. This not only has cost implications for a farmer but these incidents across a catchment have a huge impact on our water environment. Rural Sustainable Drainage Systems (Rural SuDS) will reduce agricultural diffuse pollution impacts as they are physical barriers that treat rainfall runoff. They are low cost, above ground drainage structures that capture soil particles, organic matter, nutrients and pesticides before they enter our water environment. Rural SuDS for steadings prevent blockages in drains and ditches. They contribute to good environmental practice and farm assurance schemes. In fields they can be used for returning fertile soil back to farmland and will help your business become more resilient to the impacts of climate change. Trapping soils, organic matter and nutrients means that valuable assets can be reclaimed – recent studies indicate savings of £88 per hectare per year! This Design and Build guide can be used by farmers and land managers to reduce diffuse pollution

Determining The Cost Effectiveness Of Solutions To Diffuse Pollution: Developing A Model To Assess In-Field Mitigation Options for Phosphorous and Sediment Loss

The European Union Water Framework Directive requires governments to set water quality objectives based on good ecological status. This includes specific requirements to control diffuse pollution. Diffuse phosphorous (P) pollution plays a pivotal role in influencing water quality with losses of P associated with soil particles often linked to soil erosion. The Mitigation Options for Phosphorus and Sediment (MOPS) project, using three case study sites, is investigating the cost effectiveness of specific control measures in terms of mitigating sediment and P loss from combinable crops. The analysis is conducted at the farm level using a simple spreadsheet model. Further development of the model will allow the results to be extrapolated to generic regional farm typologies. Results from the initial farm level analysis suggest that some mitigation options may not be cost effective in reducing diffuse pollution, however, that other options may be very cost effective.Resource /Energy Economics and Policy,

The regulation of diffuse pollution in the European Union:science, governance and water resource management

Reducing diffuse pollution is a perpetuating problem for environmental regulators. This paper will consider novel ways to regulate its impacts on the aquatic environment, with particular reference to rural landuse. It will look at the relationship between science, policy and law, and the contributions of integrated water resources management and governance at regional, national and river basin scales. Regulatory frameworks for water in the European Union will be explored, along with their implementation nationally in Scotland and at catchment scale in the Tweed river basin. It will conclude that regulation has a role to play, but that it is necessary to take a visionary holistic and integrated approach, nesting regulation within a governance framework that involves all stakeholders and takes full account of developing science and socio-economic drivers to meet environmental objectives

Modelling Agricultural Diffuse Pollution: CAP – WFD Interactions and Cost Effectiveness of Measures

Within the context of the Water Framework Directive (WFD) and the Common Agricultural Policy (CAP), the design of effective and sustainable agricultural and water resources management policies presents multiple challenges. This paper presents a methodological framework that will be used to identify synergies and trade-offs between the CAP and the WFD in relation to their economic and water resources environmental effects, and to assess the cost-effectiveness of measures to control water pollution, in a representative case study catchment in Scotland. The approach is based on the combination of a biophysical simulation model (CropSyst) with a mathematical programming model (FSSIM-MP), so as to provide a better understanding and representation of the economic and agronomic/environmental processes that take place within the agricultural system.Bio-economic Modelling, Water Framework Directive, Common Agricultural Policy, Agricultural and Food Policy, Research Methods/ Statistical Methods, Resource /Energy Economics and Policy,

Using Regulation to Tackle the Challenge of Diffuse Water Pollution and its Impact on the Great Barrier Reef

Diffuse water pollution poses a significant threat to water quality globally. Challenges associated with managing and regulating diffuse water pollution stem from difficulties in measurement and attribution of pollution ‘emissions’, as well as the cumulative nature of diffuse water pollution. The introduction of Queensland’s Great Barrier Reef Protection Amendment Act 2009 provides a timely opportunity to explore challenges associated with managing and regulating diffuse water pollution from agriculture, using the Great Barrier Reef as a case study. This article, which is presented in two parts (sections II and III), outlines the nature of diffuse water pollution; potential management and regulatory options; and existing policy, management and legislative frameworks that exist at Commonwealth and Queensland State government levels relevant to managing Great Barrier Reef water quality. In section III, the article undertakes a detailed analysis of Queensland’s Great Barrier Reef Protection Amendment Act 2009, including an assessment of the likely effectiveness of this legislation; challenges associated with the implementation, monitoring and evaluation of measures taken under this new legislation; and its significance and role in the context of other relevant Commonwealth and Queensland government responsibilities, legislation and policies

THE EFFECTS OF LAND MANAGEMENT AND PREDICTED CLIMATE CHANGE ON HYDROLOGICAL CONNECTIVITY AND DIFFUSE FINE SEDIMENT POLLUTION RISK WITHIN THE RIVER EDEN CATCHMENT.

There is a growing recognition that future management of the water quality in UK rivers will depend upon an improved understanding of the effects of projected climate change on catchment systems. Until recently, little attention has been given to the secondary effects that climate change may have. However, it is now becoming clear that successful management will depend upon research into factors beyond the primary changes in soil moisture and river flows. One area of particular concern is the way climate change may alter patterns of diffuse pollution of fine sediment, with associated impacts on river flora and fauna. If the UK is going to meet the stringent targets laid out in the EU Water Framework Directive, then urgent management of diffuse pollution is required. In 2012 only 28% of water bodies met their ecological potential or good status and 67% of river water bodies cite diffuse pollution as a key pressure which is preventing improvement and the achievement of good ecological status (Environment Agency, 2012). For management solutions to be cost-effective, they need to be targeted at the key problem areas within a catchment. This research uses the River Eden catchment in Cumbria as a test catchment and applies a hydrological simulation model, risk mapping framework and risk filter to the area in order to determine current connectivity and diffuse pollution trends. From this toolkit, projections of the future patterns of risk are calculated. The SCIMAP based toolkit predicted that the fine-sediment erosion risk varies spatially across the River Eden catchment. Locations deemed to be most at risk of causing a fine-sediment pollution issue are in the lower reaches of the catchment where intensive arable farming is found. When risks were modelled temporally, variations depending upon vegetation cover and average monthly rainfall were found. It was noted that the presence of autumn-sown crops could reduce risk over a year whilst spring-sown crops are likely to increase fine-sediment erosion risks. Several conclusions are drawn from this research: 1) it has been shown that the SCIMAP framework is an effective way of identifying critical source areas of diffuse pollution and could prove an invaluable tool to environmental managers; 2) the important role that autumn-sown crops can play in minimising erosion risk has been shown to be applicable in the River Eden catchment and the best way to incorporate this into crop cycles highlighted; 3) through the use of projected climate change data and a hydrological simulation model, it has been shown that the location of critical source areas are likely to change as a result of projected climate change and associated variability in rural land management. This highlights the need for continuous catchment-wide monitoring and management of hydrological connectivity and associated diffuse pollution risks

Identifying critical source areas using multiple methods for effective diffuse pollution mitigation

Diffuse pollution from agriculture constitutes a key pressure on the water quality of freshwaters and is frequently the cause of ecological degradation. The problem of diffuse pollution can be conceptualised with a source-mobilisation-pathway (or delivery)-impact model, whereby the combination of high source risk and strong connected pathways leads to ‘critical source areas’ (CSAs). These areas are where most diffuse pollution will originate, and hence are the optimal places to implement mitigation measures. However, identifying the locations of these areas is a key problem across different spatial scales within catchments. A number of approaches are frequently used for this assessment, although comparisons of these assessments are rarely carried out. We evaluate the CSAs identified via traditional walkover surveys supported by three different approaches, highlighting their benefits and disadvantages. These include a custom designed smartphone app; a desktop geographic information system (GIS) and terrain analysis-based SCIMAP (Sensitive Catchment Integrated Modelling and Analysis Platform) approach; and the use of a high spatial resolution drone dataset as an improved input data for SCIMAP modelling. Each of these methods captures the locations of the CSAs, revealing similarities and differences in the prioritisation of CSA features. The differences are due to the temporal and spatial resolution of the three methods such as the use of static land cover information, the ability to capture small scale features, such as gateways and the incomplete catchment coverage of the walkover survey. The relative costs and output resolutions of the three methods indicate that they are suitable for application at different catchment scales in conjunction with other methods. Based on the results in this paper, it is recommended that a multi-evidence-based approach to diffuse pollution management is taken across catchment spatial scales, incorporating local knowledge from the walkover with the different data resolutions of the SCIMAP approach

Implementing the water framework directive and tackling diffuse pollution from agriculture: Lessons from England and Scotland

Tackling diffuse pollution from agriculture is a key challenge for governments seeking to implement the European Union's Water Framework Directive (WFD). In the research literature, how best to integrate and align effective measures for tackling diffuse pollution, within the context of the EU's multilevel governance structure, remains an open question. This paper focuses on the first and second implementation cycles of the WFD to explore how national governance arrangements either facilitated or hindered the adoption of effective policies, especially with regards to the delivery of agricultural and water policies on the ground. It draws on data collected through systematic document analysis and interviews with key experts, policymakers and interest groups, and presents a comparative analysis of two case studies: England and Scotland. The case studies show that Scotland's joined-up governance structure, which enabled policymakers and interest groups to work together and to build trust and cooperation, facilitated the adoption of stricter measures for tackling diffuse pollution. In contrast, in England institutional fragmentation prevented a meaningful engagement of all parties and acted as a barrier. The analysis unpacks the design of policy mixes and the conditions that allow national governments to pursue more holistic and integrated governance approaches to overcome opposition from interest groups and gain their support

Advances in ecotechnological methods for diffuse nutrient pollution control: wicked issues in agricultural and urban watersheds

Considerable time and funding have been committed to tackling nonpoint source (NPS) pollution in agricultural and urban watersheds . Notwithstanding all these efforts, the water quality in many AUWs has not significantly improved. Diffuse nutrient pollution involves the movement of these pollutants between soil and water. Excessive diffuse pollution has been accepted as one of the main causes of failure to attain favorable environmental conditions in freshwater systems. Recently, several technologies and practices have been implemented to manage diffuse pollution, namely: a) source reduction, b) pollutant retention over the movement process; c) nutrient recycling, and d) purification and restoration of the eutrophic water bodies. This paper synthesized the existing knowledge of key methods to tackle diffuse pollution from AUWs. Furthermore, the predominant purification mechanisms and impacting factors are explored, allowing a comprehensive and critical understanding of different control strategies to improve the management of diffuse pollution. Therefore, potential approaches for strengthening the performance of control technologies for diffuse pollution treatment and remediation are discussed. Although adopting source reduction strategies (e.g., the “4R” approach: right rate, right time, right source, and right placement of nutrients) could efficiently decrease surface runoff and pollutant levels, they may not stop runoff from entering nearby streams. Consequently, comprehensive treatment of agricultural runoff still requires extra process retention strategies. Overall, the findings of this paper showed that treatment system design and operational and environmental factors played crucial but variable roles in diffuse pollution treatment. Moreover, the results showed that combining or integrating constructed wetlands with other control technologies could enhance the comprehensive purification of diffuse pollution compared to using a single method. This review proposes a systematic approach for diffuse pollution control based on three components (water, soil and microbiota) and maximizing the regulating services of agroecosystems via land use/cover types. The current review contributes to the documentation of existing research trends. It sheds light on diffuse pollution control approaches in AUWs, and further encourages the development of this vital field