Water Cycle Study - East Devon District Council

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7.7 Water demand management Ref EWCS April 2010 Exeter and East Devon Water Cycle Study National policy - Future Water 7.7.1 The Government’s new water strategy for England, Future Water was published in February 2008. Future Water outlines a strategic and integrated approach to the sustainable management of our water resources to 2030, for the public water supply as well as for the provision of healthy ecosystems and the services they provide. 7.7.2 The Vision by 2030 includes the following measures: • Reduced per capita consumption of water through cost effective measures, to an average of 130 litres per person per day (l/p/d) by 2030 or possibly even 120 litres per person per day depending on new technological developments and innovation • Amend the Building Regulations to include a requirement for a minimum standard of water efficiency in new homes. The requirement will be in the form of a calculated whole building performance standard set at 125 litres per day (l/p/d). • In areas of serious water stress it is believed that near universal metering will be needed by 2030. 7.7.3 In response to the Strategy, the Environment Agency have stated that in water stressed areas the introduction of universal metering needs to be undertaken earlier. The Environment Agency would like to see the majority of households in areas where water is scarce to be metered by 2015 with the remainder in water scarce areas being metered by 2020. The Environment Agency also wish to promote the metering of all new properties, including flats. 7.7.4 Reductions in PCC of the order aspired to in Future Water will require more widespread changes to underlying cultural attitudes to water use. Such changes are not directly within the control of water companies. Until there is evidence of this change, planning future water supplies on the basis of such an assumption would be a high risk strategy. Code for Sustainable Homes (CSH) 7.7.5 The Code for Sustainable Homes introduces a step-change in sustainable development and forms a basis for future developments to the Building Regulations. As of May, 2008 the Government has made it mandatory that all new homes have a rating against the Code for Sustainable Homes. The Code measures the sustainability of a new home against nine categories of sustainable design, rating the 'whole home' as a complete package. The Code uses a 1 to 6 star rating system to communicate the overall sustainability performance of a new home. The Code sets minimum standards for energy and water use at each level. 7.7.6 The relevant sections in relation to the Water Cycle Strategy are: • Water Efficiency; • Surface Water Run-off; and • Energy / CO 2 (relating to heating water). 7.7.7 A minimum requirement for each of the nine categories is necessary to achieve the base rating of Level 1. Beyond this, threshold values must be attained for both ‘Water’ and ‘Energy’ to achieve higher code levels. Hence to achieve for example Code Level 3, the requirements for both carbon and water efficiency must be achieved in addition to the minimum points system requirement. 74
Exeter and East Devon Water Cycle Study Points may be awarded in the other sustainability categories for initiatives and measures implemented beyond the base level requirement for Code Level 1. 7.7.8 Table 7.5 below defines the Carbon and Water Efficiency requirements for each Code Level rating. This assumes the basic entry requirements are met for the other six categories. 7.7.9 All new social housing already has to be built to CSH level 3, and the Water Act 2003 places a requirement on LPAs to take steps wherever practicable to encourage the conservation of water. It should be noted that to attain Code Level 3, a home must satisfy the criteria for carbon AND water efficiency. The reduction in use of heated water can therefore contribute towards achieving higher targets for both carbon and water efficiency. 7.7.10 The Environment Agency recommends that measures are adopted to allow the efficient use of water in all new homes with water efficiency set at 105 litres pre head per day (i.e. level 3/4 for water within Code for Sustainable Homes) or better. Table 7.5 – Code Level requirements for energy and water efficiency (Source: Code for Sustainable Homes – A Step Change in Sustainable Home Building Practice. Crown Copyright, 2006.) 75 Ref EWCS April 2010
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