1 / 20

Code for sustainable homes

Code for sustainable homes. Water efficiency and surface water runoff Jonathan Reed Atkins Water & Environment. Introduction. Atkins Water – why important? The Code objectives Water efficiency Surface water runoff Conclusions. Atkins at a glance. With a turnover of c.£1.2bn, Atkins is:

tvirginia
Télécharger la présentation

Code for sustainable homes

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. Code for sustainable homes Water efficiency and surface water runoff Jonathan Reed Atkins Water & Environment

  2. Introduction • Atkins • Water – why important? • The Code objectives • Water efficiency • Surface water runoff • Conclusions

  3. Atkins at a glance With a turnover of c.£1.2bn, Atkins is: • One of the top 10 Best Big Companies to work for • The largest engineering consultancy in the UK • The largest multi-discipline consultancy in Europe • The 4th largest design firm in the world • Voted no.1 with ‘Best Reputation’ in Environment

  4. Water “[water efficiency has] minimum standards that must be achieved at every level of the code, recognising [it’s] importance to the sustainability of any home.” Why? • Water efficiency can be implemented now; • Range of sustainability benefits – energy, environmental impacts, etc. • Improved adaptation to climate change. Two areas covered by Code: • Water efficiency • Surface water run-off

  5. Water Efficiency • Weir Wood Reservoir in August 2005 • Lowest recorded levels • Increase in demand for water should be minimised • Demand for water measured as a ‘Per Capita Consumption’, i.e. litres per head per day

  6. Surface water run-off and flooding • Impact of hard surfacing on run-off, infiltration and drainage

  7. Water Efficiency • Code Objectives

  8. How water is used • Components of demand • 2/3 of total consumption through: • Toilets • Taps • Showers Components of household water use for average days (WRc 2005)

  9. Step 1 – minimise water use • Toilets • Dual flush 6/4 litre • Can be reduced further • Showers • Flow rates of 6-9 l/min • Aerating shower heads • Flow restrictors • Baths • Shaped baths

  10. Step 1 – minimise water use • Taps • Aerated taps (downstairs sinks) • Flow restrictors • Appliances • Dishwashers • Washing machines • External • Fit a water butt

  11. Water Efficiency • Code Objectives

  12. Step 2 – use of non potable water • Rainwater and greywater • Risk assessment • Secondary pipework system

  13. Surface water runoff New development has two main impacts: • Increases runoff rates – making flooding worse elsewhere • Reduces volume available for floodwater in the floodplain

  14. Surface water run-off • Code objectives

  15. PPS25 – Development and flood risk • Environment Agency are statutory consultees • Aims to minimise the risks of development in flood risk areas • Areas designated by the risk of flooding

  16. Run-off vs Time for storm event Hard surfacing Natural runoff rate Run-off Time Benefit of SUDS • Manages water at source and reduces peak flows • Improves water quality • Improves both visual and natural habitats

  17. SUDS techniques • Permeable paving • Allows water infiltration • Swales • Flow attenuation and conveyance • Green roofs • Reduce run-off volume and rate • Underground storage • High density development

  18. Long term maintenance of SUDS • Maintenance • Long term maintenance of SUDS needed • Who by? • Sewerage undertaker • Local Authority • Highways Authority • How? • Early consultation needed • Sewers for Adoption • Model agreements for SUDS

  19. Conclusions • Water efficiency • Water efficient appliances • Toilets and showers • Non potable use of water • Rainwater or greywater for toilet flushing • Water butts • Surface water runoff • SUDS to reduce and improve surface water runoff • Flood risk controlled through links with PPS25

  20. Thank you

More Related