1 / 51

Rainwater Harvesting: A Sustainable Solution for Water Conservation

Explore the reasons for water scarcity, the benefits of rainwater harvesting, legislative requirements, and the key components of a rainwater harvesting system. Learn how this practice can contribute to a sustainable water resource. Presented by Brett Martin Plumbing & Drainage.

ggardner
Download Presentation

Rainwater Harvesting: A Sustainable Solution for Water Conservation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction • Agenda • Learning Aims • Brett Martin

  2. Agenda Introduction – Learning aims – Brett Martin Section 1 – Why Harvest Rainwater? Our Demand for water The cost of water Population growth Climate Change Legislation Section 2 – Rainwater Harvesting Systems Key components Design & Application Calculating storage capacity Tank installation Section 3 –Conclusion (Learning outcomes), Q&A

  3. Learning aims • To outline the key factors which place pressure on water resources. • To demonstrate how RW Harvesting can contribute to providing a sustainable water resource. • To gain a full appreciation of the legislative requirements in place to conserve water. • To understand the options & key components associated with a RW Harvesting system.

  4. Brett Martin Plumbing & Drainage • Part of the Brett Martin Group of Companies • Manufacturers of specialist plastics • Turnover £112 million • HQ in Co Antrim • P&D Division HQ in Derbyshire • Export to 70 countries • Employ over 800 people • Over 6 sites

  5. Service & Support • Certification & Accreditation • Expert Technical Advice

  6. Our demand for water Water for life

  7. How we use our water in the home 150 Litres The amount of water used per person per day 50%Could be supplied by rainwater harvesting

  8. How we compare with our European neighbours

  9. Embedded Water 3400Litres pppd One slice of bread requires 40 Litres of water 2608 Litres (689 gallons) of water to produce 3.8Litres (1 gallon) of Beer 65% of water we consume is in our food

  10. Water metering UK Average household water bill for 2012-13 Water bills will increase on Average 3.5% April 2013 – March 2014

  11. Water metering 30% -UK Households have a water meter 10% -Household water consumption is reduced after a meter is fitted. Surface water Rebate -If no surface water from your property enters a public sewer then you may qualify for a reduction in your sewerage charge ('surface water drainage rebate'). 

  12. The daily cost of domestic water use

  13. The Anglian Water region £2 billion(2010-2015) Investment to improve water services. £588 million To meet the demand of 145000 new homes. 6 million customers A population growth of 20% in 20 years. One the driest regions of the country.

  14. Population Growth ONS data 62.2 million UK population (2010) Rising to 67.2 million by 2020 Reaching 70 million by 2027 In 2000 UK population was 58.8 million Are living Longer? 1 in 6 (16.4%) of the population are 65 and over

  15. Population Growth Are we a crowded Island? The UK population as 247 inhabitants per square kilometre. Compared with the Netherlands 395 Belgium 341 Japan 339 The surface area of England by land use

  16. Population Growth – Housing Shortage 300,000 new homes required each year. The industry is currently producing 100,000 new homes each year. At the height of the market in 2007, over 190,000 new homes were built.

  17. Climate Change ‘It is too early to say whether the weather we've witnessed over the last three years demonstrates that the climate is definitely changing. But we have certainly seen exceptional weather with high temperatures and droughts causing significant problems’ ‘In stark contrast, this was then followed by the wettest April to September on record, which resulted in many people suffering the misery of being Flooded’ Dr Paul Leinster, Chief Executive of the Environment Agency – Dec 2012

  18. Climate Change – Drought Sept 2010 to March 2012 Many parts of England experienced the driest 18 months for over 100 years April 2012 Seven water companies in the South & East of England imposed a ‘temporary use ban’ on 20 million customers to conserve resources.

  19. Climate Change – Rainfall & Floods April – September 2012 The wettest period on record, over 4500 properties flooded. Around 5 million people, in 2 million properties, live in flood risk areas in England and Wales. Floods are now on average nearly twice as frequent as they were 100 years ago.

  20. Climate Change – Rainfall & Floods Summer floods of 2007 Over 55,000 homes & businesses were flooded. Estimated insurance losses at £3 billion. Surface water flooding Two thirds of properties flooded was because drains & sewers were overwhelmed. Currently 80,000 properties are at very significant risk from surface water flooding.

  21. Legislation – The Code for Sustainable Homes The Code for Sustainable Homes (the Code) is an environmental assessment method for rating and certifying the performance of new homes. It is a national standard for use in the design and construction of new homes with a view to encouraging continuous improvement in sustainable home building. The code covers 9 categories of sustainable design. 2 of which concern water usage & have mandatory performance requirements.

  22. Code for Sustainable Homes - Category 2 – Water – Wat1 - Internal Water Use Aim – To reduce the consumption of potable water in the home To achieve Levels 5 & 6 (80 Litres p/day) rainwater or greywater recycling will be required

  23. Code for Sustainable Homes Category 2 – Water – Wat2 – External Water Use Aim - To encourage the recycling of rainwater and reduce the amount of mains potable water used for external water uses. The simplest method for rainwater collection is a water butt. A rainwater harvesting system can contribute to Wat1 & 2

  24. Code for Sustainable Homes Category 4 – Surface Water Run-Off – Sur1 Aim - To design housing developments which avoid, reduce and delay the discharge of rainfall to public sewers and watercourses. This will protect watercourses and reduce the risk of localised flooding, pollution and other environmental damage. Specifying rainwater recycling as part of a sustainable drainage system (SUDS) to manage surface water run-off.

  25. Code for Sustainable Homes Category 4 – Surface Water Run-Off – Sur2 – Flood Risk Aim - To encourage housing development in low flood risk areas, or to take measures to reduce the impact of flooding on houses built in areas with a medium or high risk of flooding.

  26. Legislation Building Regulations Approved Document Part G G – Water Efficiency 125 Litres ppd of wholesome water consumptions

  27. BS8515:2009 The BSI rainwater harvesting code of practice Legislation Other legislation & standards to consider:- PPS25 – Planning Policy Statement 25 Development and flood Risk Practice Guide. Building Regulations Approved Document H & G H - Drainage & Waste Disposal Environmental assessment method Best practice in sustainable design

  28. Section 2 Rainwater Harvesting Systems • Key Components • Storage Capacity • Design & Application • Tank Installation

  29. Rainwater Harvesting Home & Garden Systems Direct Feed System

  30. Rainwater Harvesting • Key components • Pipework • Filter Unit • Calming Inlet • Floating intake • Pump & Control Unit

  31. Key components – Pipework In accordance with BS8515 & WRAS Pipework for non potable water (rainwater) Recommended pipes should be Green or Black & Green. Blue pipework is a recognized standard used for potable water.

  32. Key components – Filter Unit • To comply with BS8515:2009 • Designed as a ‘in-tank’ or ‘pre-tank’ filter • Stainless steel –water & weather resistant • Removable 35 micron fine mesh filter • 15˚ fall on flow • 3 x 110mm inlets (160mm Channel option) Independently tested at Newcastle University for flow efficiency. Achieved 98% efficiency on flow rates up to 5 litres per second

  33. Key components Calming Inlet • To comply with BS8515:2009 • Fitted to drainage pipe feeding rainwater into storage tank. • Minimises turbulence • Slows water flow into tank • Prevents disturbance of any sediment • at the base of the tank • Ensures oxygenation, to discourage Algai growth

  34. Key components • Floating Intake • In accordance with BS8515:2009 • Extracts the cleanest water available. • Located approximately 100 to 150mm below the surface of the water. • Further filters the water.

  35. Key components – Submersible Pump • Direct feed system. • Delivers water to the point of demand. • In the unlikely event that there is no water in the tank:- • The system is equipped with run dry protection. • Pump will switch off to prevent burn out. • Pump should be removable for maintenance purposes

  36. Key components – Control Unit Tundish – AA Air Gap Prevents ‘backflow’ & contamination of mains water supply, meets requirements of BS EN 13076 Float switch Should the tank run dry the float switch will drop to provide mains water back up. Positioned around 300mm from base of tank

  37. Design & Application – RWH • Low profile tank Systems • 1500 Litre tank weighs only 62 kilos (9.5 stone) • Can be lifted by two persons, reduces the requirement for plant machinery • Easier access through properties • (through doorways) • Lower levels of excavation

  38. Design & Application – RWH Low Profile Systems – Tank connections Large underground storage Attenuation

  39. Calculating Storage Capacity In accordance with BS8515:2009 The following factors should be identified in order to calculate the size of the system; • The amount & intensity of rainfall • The size & type of collection surface • The number & type of intended applications, both present & future As set out in BS8515:2009 – The three approaches, simplified, intermediate & detailed, are recommended for sizing.

  40. Calculating storage capacity – The intermediate approach Development: New Build Bungalow in St Brides Major, S. Wales Roof Area –168.75m² Annual Rainfall – 1151.9mm (Taken from Cardiff Weather station)

  41. Calculating storage capacity – The intermediate approach The lesser figure should be used to calculate storage capacity

  42. Tank Installation • Avoiding flotation • Resisting ground pressures • Water table fluctuations • Resisting vehicle loadings

  43. Tank Installation Polyethylene material (HDPE) Rotationally moulded one piece mould Lightweight material Excellent impact resistance High tensile strength Tank sizes 1200 Litre 2000 Litre 3500 Litre 6000 Litre 1500 Litre LR

  44. Tank Installation The tank is encased in concrete

  45. Tank Installation Vehicle Loading A load bearing slab should be constructed Filter run off & overflow Fill tank Continue to fill tank with water whilst backfilling Ensure water level remains 300mm above concrete level Concrete Surround To be poured & completed in multiple lift (approx 300mm) 250mm Slab Base Depth

  46. Design & Application – Domestic RWH Home & Garden System

  47. Design & Application – Agriculture RWH Garden System

  48. Design & Application – Agriculture RWH Garden System

  49. Design & Application – Domestic RWH Home & Garden System

  50. To Conclude, learning outcomes; Harvesting rainwater can ease the pressure placed on our water resources, caused by factors such as climate change & population growth. Contributing to providing a sustainable water resource with the capabilities to satisfy legislation and the potential to save money. Thank you, any questions? Conclusion - Thank You - Questions

More Related