Dusty Gedges - EFB

“Quando alguém cria uma cobertura verde numa casa, não precisa de temer que

a casa se dissolva na paisagem.”Freidensreich Hundertwasser (1928-2000) – Artista plástico, arquitecto e filósofo austríaco

Future Cities - Cidades Futuras

Dusty GedgePresidente da

EFB

CIDADE

Quente

IMPERMEÁVEL

Seca

PoluídaAr

Água

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A bullet point

Another one

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NATURE

www.livingroofs.orgwww.greenroofconsultancy.com

www.livingroofs.orgwww.greenroofconsultancy.com

742

Late June 09 - Health Alert 2

Early July Intense Short rainstorms

Alterações Climáticas - UK

Aumento da temperatura no Verão

– em particular nas cidades

Aumento da probabilidade de

ocorrência de precipitações intensas

– fenómenos de inundações

repentinas

• Falta de solo e de permeabilidade

• Falta da vegetação e de evapotranspiração

• Falta de ecosystems services

„...UK cities will need an increase of at least 10%

green space by 2020 to combat climate

change..University of Manchester 2005

Áreas urbanas - o problema?

Manchester and

Central London -

No room for parks

City of London

No room for trees

Ecosystem Services

PolinizaçãoHabitat

Regulação do clima / inundações

Protecção e abrigoAgua potável

Intensive green roof

Intensive green roof

Extensive Semi intensive Intensive

Use Ecological Landscape Garden/Ecological Landscape Garden/Park

Type of vegetation Moss-Herbs-Grasses Grass-Herbs-Shrubs Lawn/Perennials, Shrubs, Trees

Benefit W, T, B W, T, B, A W, T, B, A

Depth of substrate 60 - 200mm 120 - 250mm 150 - 400mm

Weight 60 - 150 kg/m2 120 - 200 kg/m2 180 - 500 kg/m2

Cost Low Periodic High

Input is the defining factor

Extensive green roof

Extensive green roof

Extensive green roof

Extensive green roof

Extensive green roof

Mitos e desafios

Incêndio

Manutenção Text

EstabilidadeIntegração

paisagística

Infiltrações

INCÊNDIO

Waterproofing

“Vor sprung durch technik”

•Green roof element protects waterproofing

•From UV, ponding, frost etc

•Can double/triple life of waterproofing

Maintenance

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www.livingroofs.orgwww.greenroofconsultancy.com

27

• Intensive - depends on the vegetation - High

Maintenance/Input

• Extensive - low maintenance - biannual weed

and clear out of outlets perimeters

• Instant green - higher maintenance later

• Slow greening - less maintenance long term

Lightweight sedum mat 90kg/m2

Substrate based extensive green roof 120 -150 kg/m2

Paving/shingle 120 kg/m2

Semi intensive 200 -250 kg/m2

Intensive 300 kg/m2

STRUCTURE

Aesthetics

Extensive - adornment or ecology

One of the main concerns during design

process

Energia e Água

Energia

• Macro and the Micro

• City Scale and Building Scale

• Cities can be 5 degrees warmer than

the country side

Energia e Água

• Vegetated landscapes need water

• Plants - „sweat‟ - evapotranspirate

• Evapotranspiration = cooling

CIDADES FRESCAS / CIDADES

VERDES

Roehr: 10 % de redução no uso de energia

14% de redução da escorrência superficial

Energia e Água

Paradise Park

•Brown roof is approximately 150mm

•Slows heat transfer by 6 hours

•Between noon and 1800 no heat transfer

•28kW heat gain

•9.2kW per hour would normally be used

•Needs no air conditioning

•Saving 3,800kWhrs/year

Z1

Z4

Z2

Z9

Z3

Z10

Z11

Z12

Z12

Z15

Z16

Z13

Z5

Z6

Z7

Z8

25%

1%

9%

2%

0%

5%

1%

2%

9%

22%

Summer Reductions with Green Roof4.15Kwh/msq/yr

Winter Reductions with Green RoofBetween 2 - 6 Kwh/msq/yr

Power and Plants

Evapotranspiration

maintains ambient

temp. close to 25

degrees C

ÁGUA

Water

+

Toilet reuse

Run off Volume Rate of run off

Irrigation

Stormwater Attenuation

Rainfall Harvesting

Water Retention

TYPE OF

GREEN

ROOF

DEPTH [MM] VEGETATION WATER RETENTION

ANNUAL AVERAGE %

Extensive 20-40 MOSS/SEDUM 40

40-60 SEDUM/MOSS 45

60-100 SEDUM/MOSS/HERBS 50

100-150 SEDUM/HERBS/GRASS 55

150-200 GRASS/HERBS 60

Intensive 200 - 250 LAWNS/SHRUBS 60

250 - 500 LAWNS/SHRUBS 70

<500 LAWNS/SHRUBS/TREES <90

Rainfall AttentuationRoofs are source -green roofs a

source control mechanism

In practice there is very little runoff for

many rainfall events

A lot of the water that falls on the roof

is removed by evaporation and

transpiration from plants

Runoff volumes and rates are reduced

In Germany green roofs are important

part of zero discharge sites

Rainfall Harvesting

Can use water from roofs as grey

water

Some commercial substrates have

nutrients which leads to

discolouration of water

Discoloration disappears after few

years once vegetation established

If are going harvest „no‟ nutrient

substrate can be used

POTSDAMMER PLATZ

Drawn by: Kevin Perry

Drawn by: Kevin Perry

Nature

Black redstart

Rare pollinators need substrates as

well as plants

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New London Plan• The Mayor will and the boroughs should expect all major developments to in

corporate living roofs and walls, where feasible and reflect this in Local Development

Framework policies. It is expected that this will include roof and wall

• planting that delivers as many of these objectives as possible:

• Accessible roof space

• Adapting and mitigating for climate change

• Sustainable urban drainage

• Enhancing biodiversity

• Improved appearance

• Boroughs should also encourage the use of living roofs in smaller developmentsand extensions where the opportunity arises

Text

Up to 2004 = 76,682m2 /825,400ft2

2004 -2009 = 326,682m2/3 million ft2

Total greater than 500,000m2

Area of green roofs = 326,682m2/3.5 million ft2

Hyde Park/Kensington gardens = 250,000m2

Existing roofs in the City

10 million m2 potentially could

be greened

There is more to do!

TextText

OBRIGADO

dusty@dustygedge.co.uk