PROSuDs: Providing Real-world Opportunities for Sustainable Drainage Systems

开发，如住宅区，通常意味着更多的雨水“流走”的表面相比，绿色领域。这种增加的“城市径流”往往会导致下游更多的河流或地表水泛滥，而且还含有从表面冲刷下来的污染物，如金属和汽车的油。可持续排水系统（SuDS）是一种排水概念，旨在通过构建系统将雨水送回地下或储存，然后将其缓慢释放回河流，从而模拟开发前的水文。这通常涉及创建草沟和湿地，这可以创建有吸引力的城市地区，动物和植物的栖息地，也可以捕获和去除污染物。SuDS是绿色基础设施理想的组成部分之一。研究表明，SuDS可以提供这些“生态系统服务”，并且已经制定了设计指南。然而，SuDS通常比传统的管道排水系统占用更高的土地，这是住房开发商的一个担忧。它们也有非常不同的，往往不太了解，维护要求。它们的寿命以及如何管理污染物的长期积累也存在不确定性。自来水公司“采用”管道排水，但在英格兰，长期采用和支付的SuDS是不确定的。作为政府较轻接触规划政策的一部分，要求将SuDS纳入计划并由地方当局采用的规划指导和立法也被淡化。这意味着，实现河流污染降低、城市环境改善和生物多样性增加等额外效益，取决于SuDS对开发商的经济吸引力。然而，这种经济评估没有标准准则，不同的方案使用不同的计算方法和界限。因此，SuDS的估值需要标准化，以便可以比较方案，为高质量的设计分配适当的土地，并在项目评估中给予房地产专业人士信心。该项目将与包括开发商、监管机构和SuDS设计师在内的利益相关者合作，为计算SuDS的资本成本、量化开发的经济价值（例如房价、居民支付维护费用的意愿）提供最佳实践指导，并探索可以为场外利益寻求哪些其他贡献。主要合作伙伴将是为工料测量师和估价测量师提供专业指导的皇家特许测量师学会。我们将与RICS合作，创建一个专业的指导说明，并根据案例研究项目进行测试。除此评估工具包外，还将开发培训材料并提供给测量专业人员。总体目标是通过综合和转化环境，社会和工程效益，以允许将其纳入决策过程的方式，提高高质量SuDS设计的采用率。朴茨茅斯大学的团队由研究SuDS技术方面超过20年的工程师和具有评估社会和环境服务经验的评估测量师组成。因此，这个多学科团队很好地完成了这个创新项目。

Developments, such as housing estates, generally mean that more rain "runs off" the surface compared to green fields. This increased "urban runoff" often causes more river or surface water flooding downstream and also contains pollutants washed off from surfaces, such as metals and oil from cars. Sustainable Drainage Systems (SuDS) are a drainage concept that aims to mimic the pre-development hydrology by constructing systems to pass rain water back into the ground or store it, and then release it slowly back into rivers. Often this involves creating grass channels and wetlands, which can create attractive urban areas, habitat for animals and plants and also trap and remove pollutants. SuDS are one of the components of the Green Infrastructure ideal. Research has shown that SuDS can deliver these "ecosystem services" and design guidance has been developed. However the SuDS often have a higher land take than traditional piped drainage, a concern to housing developers. They also have very different, often poorly understood, maintenance requirements. There is also uncertainty about their longevity and how to manage any long term accumulation of pollutants. Water Companies "adopt" piped drainage, but in England the long term adoption and payment for SuDS is uncertain. Planning guidance and legislation requiring SuDS to be included in schemes and adopted by local authorities has also been watered down as part of the Government's lighter touch planning policy. This means that achieving the additional benefits of lower pollution in rivers, improved urban environment and increased biodiversity are dependent on SuDS being able to be economically attractive to developers. However there are no standard guidelines for this economic evaluation and different schemes use different methods and boundaries for calculations. Therefore valuation of SuDS needs be standardised so that schemes can be compared, the appropriate amount of land allocated for high quality designs and to give confidence to property professionals in project appraisal. This project will work with stakeholders, including developers, regulators and SuDS designers to arrive at best practice guidance for calculating the capital costs of SuDS, quantifying the economic values to developments (e.g. house prices, willingness to pay for upkeep by residents) and to explore what other contributions can be sought for off-site benefits. Key partners will be the Royal Institution of Chartered Surveyors (RICS) who provide professional guidance to quantity surveyors and valuation surveyors. We will work with RICS to create a professional Guidance Note and test this against case study projects. In addition to this valuation toolkit, training materials will be developed and delivered to surveying professionals.The overall aim is to increase the uptake of high quality SuDS designs through synthesising and translating the environmental, social and engineering benefits in a way that allows their inclusion in decision-making processes. The University of Portsmouth team is made up of engineers who have studied the technical aspects of SuDS for over 20 years and valuation surveyors who have experience of valuing social and environmental services. This multidisciplinary team are therefore well placed to deliver this innovative project.