Dr. Hanna Bornholdt Ministry for Environment and Energy

Green Roof Strategy for Hamburg

Green Roof Strategy for Hamburg

Outline 1. Starting Point 2. Aims and Concept 3. Action Point „Promotion“ 4. Action Point „Dialog“ 5. Action Point „Stipulation“ 6. Action Point „Scientific Support“

1. Starting Point

Starting Point

© Bildnachweis

CONSOLIDATION Foto © Cornelia Peters

Starting Point

Mühlenkamp Hamburg 2011 © D. Heien

RISK OF FLOODING

Foto M. Reifner

The 1st Mayor’s Mandate

2. Aims and Concept

Aims

www.hamburg.de/gruendach

© Vision TH Landschaftsarchitekten Luftbild M. Friedel

Guiding principles

Unused Space © Isadora Tast

New Free Space © Hunck + Lorenz Grow vegetables or plant flowers © Auböck + Kárász

C. Kottmeier

Guiding principles

Space for bees, birds and plants © I. Tast Solar energy and green roof © Neher

Micro climate © Miguel Ferraz Araújo Water retention and evaporation © Dreiseitl

Four action points FO

TO:

BSU

Promotion

Funding programme

Reduced rain water tax

Green roofs on public buildings

Dialogue

Public relations

Communi-cation

Green roof competition

+

+

Stipulation

Land Use Planning Nature

protection Green roof regulation

Grafik verändert nach Leitfaden Dachbegrünung für Kommunen 2011

+

Scientific support

Measurement programme Evaluation programme

3. Action Point „Promotion“

• 3 Mill. Euro until 2019 • all new buildings and refurbishments • owners who voluntarily green their roofs • at least 20 m², not exceed 30 degrees in pitch • Eight/twelve centimetres substrate • subsidies up to 60 percent of production costs • Maintenance funding • owners of a green roof can also save 50 per cent on rain water fees • www.ifbhh.de/gruendachfoerderung

Green Roof Promotion

Visualisierung: TH Treibhaus Landschaftsarchitektur

Module Grants

Basic funding Basic funding 6.00 €/m² net vegetation area (NVA)

+ 1.00 €/m² NVA per cm rooting layer thickness

Maintenance funding 1 year 50% of costs of maintenance/m² NVA

Additional funding Reinforcing the statics / root penetration protection

5.00 €/m² NVA + fire break area

Combined with solar energy generation

5.00 €/m² gross collector (module) area

Improving runoff delay 2.00 €/m² NVA for additional costs for technical and construction elements

Space utilization area 14 €/m²

Inner city measures basic funding increased by 15%

Overview of funding guidelines

Luftbild Mathias Friedel

Funding Example

New office building: 350 m2 12 cm thickness Combined with solar energy

Funding Example

Total Funding: 8.000 € Eligible costs: 16.000 € Aid intensity: 50 %

© Vision TH Landschaftsarchitekten Luftbild M. Friedel

4. Action Point „Dialog“

Communication. On the roofs, get set, green!

Foto B.J.Davidse

Foto B.J.Davidse

FAZ 24.5.2015

Visualisierung: TH Treibhaus Landschaftsarchitektur

www.hamburg.de/gruendach/

5. Action Point „Stipulation“

Focus on roof greening, façade and street space greening SU, LP2

© Chicago Climate Action Plan report

© Chicago Climate Action Plan report

66o

23o

oC

Landscape Programme – Urban Climate Concept

Build before 1985 Build after 1985

Linz, E. Maurer Foto © H.Pertlwieser

Land-Use Plan

5. Action Point „Scientific Support“

Research at HCU-Greenroof

2.200 m² extensiv greenroof 470 m² for measurements 80 m² technical infrastructure 6 cm substrate

Discharge measurements © HCU Measurements of precipitation

Discharge measurements

Measurements

Short term impact – 1-hour

© HCU

Precipitation: 335 mm in 5 months Runoff: 109 mm = 33%

Long term impact - 5-month

Precipitation: 17 mm in 60 min (return period for HH: 1,7) Runoff: 8 mm = 47%

© C. Blanke 8 House Kopenhagen © H. Bornholdt

© H. Sönksen

Many Thanks! Dr. Hanna Bornholdt gruendach@bue.hamburg.de

© Isadora Tast