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WATER is selected. This stage also includes the consideration of incentives and multiple funding sources, which the formation of strong partnerships across an area will help bring. There are a growing number of calculators to assess the wider benefits (eg social and environmental) becoming available. This will be a fast developing arena, therefore look for developments and new work coming out. Once the options have been selected, the guidance identifies main issues to consider, such as confirming the ownership and adoption (which should be discussed Figure 7 An auditorium in a Swedish school 1 Target opportunities, which may be as early as possible), health and safety, playground that also acts as a detention basin achieved quickly or provides an easy permissions, detailed design, construction, during heavy rains (courtesy Dick Fenner) opportunity to manage surface water operation and maintenance. It identifies a (eg disconnection of a large area from wide range of detailed design guidance that a drainage system or large open green is freely available. To help UK stakeholders successfully space). retrofit SWMM, CIRIA worked with MWH, the University of Sheffield and 2 Common opportunities are areas Finally the guidance outlines why it is Susturb to develop and write guidance where similar types of measures may be important to consider monitoring either that was published in April 2012 (Digman retrofitted and approaches targeted. to undertake maintenance activities. Thisto confirm the performance and when et al, 2012). The guidance was written to 3 Future opportunities are where there is not only for the hydraulic and water support a diverse range of stakeholders and is opportunity to align programmes of quality performance, but also about practitioners across the many disciplines work and potential funding. how the measures are accepted by the needed to successfully retrofit measures. local community. Statutory and other The guidance sets out how to overcome requirements are highlighted for the The guidance provides a framework to the common hurdles to retrofitting SWMM practitioner to consider and how this facilitate more effective retrofitting of in the UK. It provides a structure to match should form part of an asset management surface water management measures. up the needs with the opportunities to approach. It outlines how to take a strategic or then assess the potential effects and where opportunistic retrofit approach depending and when to first look to retrofit. Based on The guidance is primarily intended for use upon the drivers and the scale of the the joint understanding of the needs and by those working with the existing urban retrofit. Urban design is firmly at the heart opportunities, retrofit strategies can be environment and who wish to manage of the guidance and its framework, with developed considering the wider benefits surface water in a way that maximises the examples shown of how retrofit measures that may be possible. benefits and tackles the future challenges could be implemented in different urban ahead. It focuses on how to retrofit surface areas (like Figure 3). Having practitioners The next stage is to develop options. The water management measures into the thinking differently will be vital to guidance provides an approach to consider urban environment, either as part of a successfully change the approach to surface a mix of traditional measures and SuDS. strategic programme of work or by realising water management. Tables have been developed to support the opportunities incrementally as they arise. It practitioner to select measures in different is applicable to a wide range of disciplines, The guidance follows a structured project locations and the potential benefits they professions and stakeholders, deliberately delivery approach, enabling practitioners can bring. The guidance identifies the not targeted to one audience. to follow or dip in and out as required. The importance of hydraulically modelling preparation phase outlines the main steps the performance of the measures where Fundamental to the guidance is that it to consider at the start of a project and is appropriate. There are emerging software complements and should be read in applicable to opportunistic (also known as packages to model water quality, and these conjunction with other guidance, and nibbling) or larger scale projects and will may be used with greater confidence in the relevant national and local legislation. It help ensure the wider opportunities are future. Confirming the performance enables provides an approach that can be used not missed. It recognises the importance different strategies to be tested. across the UK, applicable to the local of engagement with stakeholders and situation and community. It aims to inspire communities to successfully achieve Guidance is given on how to assess the a new way of working and is relevant retrofitting and generate multiple benefits. to a wide range of professionals andcosts and a wide range of benefits that often will go beyond the initial driver of organisations. the scheme. The appraisal approaches It is important to “truly” understand the need, ie what is the problem to be What is happening?advocated can go far beyond simple addressed (particularly for strategic Several local authorities and seweragecapital, operational and whole life costs. By retrofitting), as often this is not well undertakers are seeking and finding theadopting a wider assessment of the benefits understood. The feasibility phase outlines opportunities to retrofit a range of SWMM.it may help tilt the balance of taking a grey/ how to identify the opportunities and Some of these are simply opportunistic,green approach compared with more locations where it is possible to retrofit while others are more strategic, eg Thamesconventional approaches. Considering the measures in a structured way with three Water using SuDS (Figure 8) to resolvewider benefits that the work will bring categories of opportunities: surface water sewer flooding in Harlow,should be undertaken as early as possible to ensure the right appraisal approach Essex (Fulton et al, 2012). 4


evolutionwinter2012
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