CIRIA WSUD Workshop Cardiff
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Transcript of CIRIA WSUD Workshop Cardiff
Water Sensitive
Urban DesignDeveloping our approach in Wales
Aaron Burton
March 2012
Outline
Drivers in Wales
Pilots/ case studies
The future
Housing challenge
Additional 200,000
new homes by 2025
Additional 30,000
new homes in
Cardiff by 2025
80% of existing homes remain by 2050
DCWW
Water Resources
(context – Cardiff daily household
use is around 50 Ml/d)
Deficit zones:
SEWCUS: -12 to -104 Ml/d
Pembrokeshire: -13 to -19 Ml/d
Brecon: -1 Ml/d
NEYM: +2.9 to -5 Ml/d
Water and carbon connection
5% UK annual carbon
Emissions
(~3% in Wales)
1% UK annual carbon
emissions
Flooding – Surface water
Majority of surface
water problem locations
are in SE Wales
Scott (2011) Surface water management in a changing legislative framework, Presented at ICE Wales Flooding conferencehttp://www.ice.org.uk/getattachment/20b63757-2855-43c2-98e0-8ca42da77696/Wales-Flooding-Conference-2011-Dominic-Scott.aspx
NEF - Ecosystem services
Ecosystem Service Green roofs/ walls
Street trees Wetlands Rainwater harvesting
Water and energy efficiency
Rain gardens/ bioretention
Reduce flood risk
Offset urban heat island
Reduce energy demand
Reduce noise/ air pollution
Support biodiversity
Recreation/ leisure
Reduce water use
Reduce wastewater flows
Reduced CO2
Reduced water and energy bills
Adapted from GLA (2011) Managing risks and increasing resilience – The Mayor’s Climate Change Adaptation Strategy, p. 90,
http://www.london.gov.uk/sites/default/files/Adaptation-oct11.pdf (Accessed 05/11/12)
Pilots/
Case Studies
Water Sensitive Brynheulog
Site issues:
•Blocked
drainage
•Erosion and
WQ
•Flooding past
issue/ road
surface issues
Before
WSUD Measures Bioretention Systems
Slotted kerb opening and grate (Docklands, Melbourne)Kerb opening through lintel (Ku-ring-gai Council)
Road
Footpath
Slot in kerb
Stormwater drainage (eg 375 mm pipe)
0.5 – 1.5 m
0.5 - 1m Filter media
0.1 m Transition layer (sand)
0.15 m Drainage layer, with perforated pipes (gravel)
Impervious liner
0.1 - 0.3 m Temporary ponding
Overf low pit
Rain gardens
Wetlands at differing scales
Wetlands Wetland
/raingarden Raingardens/ RWH
Welsh Housing Quality Standard
16% of households in WalesSAP rating for energy (space and water heating)Responsible for “environment” and landscapesEAW & EST Guidance to support WHQS (based on pilot study & survey)
WC partnerships
Refurbishment
Voids and maintenance
WSUD Guidance and Pilot Studies
Community based schemes
Reeds used to cut pollution in
Llanfyllin's River Cain
Caearau & Brynglas SUDS Pilot
0
20
40
60
80
100
120
140
Baseline RWH with
Traditional
Solution
RWH with
traditional
solution
(new tech)
RWH with
traditional
solution
RWH with
traditional
solution
SuDS only SuDS +
1500l RWH
SuDS +
1500l RWH
new tech
SuDS + 300l
RWH
SuDS + 100l
RWH
Option
To
tal em
issio
ns -
wate
r, s
ew
era
ge, su
rface w
ate
r, S
uD
S,
RW
H e
mb
od
ied
(tC
o2e)
NO14 (464 props) BY21 (278 Props) BP04 (1 school + 10 props)
Broader costs and benefits? Maintenance, adoption,
uptake rates etc…
Water Sensitive Communities
Value of Water and behaviour change
0
20
40
60
80
100
120
140
All In-home Mail, events,
telephone (1)
Mail, events,
telephone (2)
Mail, events,
telephone (3)
Advice method
Carb
on
Savin
g k
gC
O2/y
r
0
5
10
15
20
25
Wate
r savin
g (
m3/y
r)
Average saving per customer (CO2 heating + embodied) Kg CO2/yr Average water saving (m3/yr)
Future work
WSUD Programme Board
To guide decision making and resource input as we develop our approach to Water Sensitive Urban Design in Wales. WSUD
WR
WFD
Land Man
Groundwater
Biodiversity
FRCM
Climate Change
Air Quality
WQ
Planning
Academic:
Retrofit2050
PREPARED
TSB Future Cities
Industry:
CIRIA Scoping Study
SuDS Wales Groups
IWA Future Cities
Pilots:
Bryheulog
Cardiff tbc
Caerau & Brynglas
CCW - NER
Wetland Mapping
HA Water Pilot
Living Wise Cardiff
Policy:
SPPSoW
Housing Bill
Planning Bill
Building Regulations
WHQS
SuDS Guidance
/SABs
Programmes:
Periodic Review
WRMP
DCWW SWEAR
DCWW SDPs
EAW CFMPs
LA SWMPs
Diffuse Pollution AP
FUTURE:
•WSUD Guidance
•Pilot technology
•Sector wide
learning programmes
(LZCH?)
•Community 1st
•EU Life+
Overview of activities in Wales Feb 2012