adaptation of hamburg‘s water infrastructure to climate change · alster protection programme...

ADAPTATION OF HAMBURG‘S WATERINFRASTRUCTURE TO CLIMATE CHANGE

EIC Spring ConferenceWorkshop: Sustainable solutions for Urban Areas – Business Opportunities for European contractors in the light of the Sustainable Development Goals

Christian Günner | 20 April 2017 | Copenhagen

AGENDA2

1 CHALLENGES FOR STORMWATER MANAGEMENT RELATED TO CLIMATE CHANGE

2 HAMBURG‘S WATER PROTECTION PROGRAMMES

3 BLUE-GREEN INFRASTRUCTURE AND WATER-SENSITIVE URBAN DESIGN

HAMBURG: A GROWING CITY

18601800 1910 1955 2012

Source: E. Kruse

increase of sealed area: 1 km² / year

10,000 new flats per year are projected

→ increase of surface runoff

→ less infiltration, less ground water resources

→ less evaporation, (locally) higher temperatures in summer

CHALLENGES FOR STORMWATER MANAGEMENT

Hamburg: A growing city → surface sealing effects

CHALLENGES FOR STORMWATER MANAGEMENT

Source: Heien

06 June 2011

Impacts of climate change → Increase of cloudbursts

STORMWATER DRAINAGE IN HAMBURG

Source: HAMBURG WASSER, K 2

TOTAL LENGTH OF SEWERS• > 5,824 km (150 - 3500 mm)

COMBINED SEWER SYSTEM• 1,218 km combined sewers• mostly in the inner city areas

SEPERATE SEWER SYSTEM• 2,320 km wastewater sewers• 1,780 km stormwater sewers• approximately 1.500 stormwater

catchment areas

HAMBURG‘S APPROACH TO STORMWATER MANAGEMENT7

I. REDUCTION OF COMBINED SEWER OVERFLOWS→ WATER PROTECTION PROGRAMSContinued water protection programmes referring to several catchment areasAdaptation of the combined sewer system

II. REDUCTION OF FLOODINGS DUE TO CLOUDBURSTSMultifunctional use of areas to prevent flooding

III. NEAR-NATURAL WATER CYCLEWater-sensitve urban designDevelopment of extensive planning and information tools

Alster Protection Programme1990 – 2005460,000000 €

Elbe Protection Programme1994 – 2004115,000,000 €

Bille Protection Programme2000 – 201525,000,000 €

Inner City Protection Programme2011 – 201970,000,000 €

OVERVIEW OF WATER PROTECTION PROGRAMMES BYHAMBURG WASSER

Wedeler Au Protection Programme2001 – 201510,000,000 €

Total cost 680,000,000 €

WATER PROTECTION PROGRAMMES

CONCEPTUAL DESIGN Separation of sewer network into partial catchment areas with sufficient transportation and retention capacity

Intercepting sewers relieve the original sewer network of combined sewage peaks occurring during heavy rainfalls and thereby minimise sewer overflows.

Combined sewage retention tanks store the remaining sewage peaks. After rainfall the sewage is pumped back into the intercepting sewer.

Additional measures: primary cleaning of pipes, control of wastewater flow for optimised utilisation of existing retention volume

WATER PROTECTION PROGRAMMES

IMPLEMENTED MEASURES10

• Construction of deep laying intercepting sewers

• Renewal of old intercepting sewers

• Construction of combined sewage retention tanks

• Creation of new retention capacity by construction of retention sewers

• Hydraulic optimisation of the combined sewer system

Pho

tos:

Kla

us K

riege

r

Underground pipe driving DN 2400 at Alter Elbpark

Pho

tos:

Kla

us K

riege

r

IMPLEMENTED MEASURES

0

500.000

1.000.000

1.500.000

2.000.000

2.500.000

3.000.000

3.500.000

4.000.000

Combined Sewer Overflows [m³/a]2007 compared to 1982

WATER PROTECTION PROGRAMMES – SUCCESS REVIEW

TOPICS

• Flood protection

• Water protection

• Near-natural water cycle

RESULTS

• Concept for stormwater management in Hamburg

• Adaption of financial, political and administrative conditions

Objectives of RISA

Fig:

Tob

ias

Erns

t

www.risa-hamburg.de

RESULTS AND MEASURES14

PROJECT EXAMPLES

• Reduction of surface sealing• Stormwater retention• Multifunctional use of areas to prevent flooding• Stormwater treatment

DEVELOPMENT OF TECHNICAL REQUIREMENTS, GUIDELINES AND MANUALS, E.G.• Water sensitive school yards / road design• Information for house owners

EXTENSIVE INFORMATION BASIS

• Maps and layers of information for planning purposes

WATER-SENSITIVE ROAD DESIGN

Existing situation

Retrofitting raingardensfor infiltration

Fig:

MU

STSt

ädte

bau

Gm

bH

Source: FHHWater Sensitive Road DesignSource: FHH

WATER-SENSITIVE ROAD DESIGN

PROJECT EXAMPLE: FLOOD PROTECTION THROUGH MULTIFUNCTIONAL USE OF AREAS

17

Multifunctional use of a children‘splayground for flood protection

• Previous flooding of a nearby school• Stormwater retention basis too small,

but no possibilities for further extension• Use of playground area in case of heavy

cloudbursts

Pic

ture

: Wol

kenh

auer

PROJECT EXAMPLE: MULTIFUNCTIONAL USE OF A PARK AREA18

Frequent cloudburst, 27.05.2007 30.05.2010public park

underground car park

PROJECT EXAMPLE: MULTIFUNCTIONAL USE OF A PARK AREA19

WATER-SENSITIVE URBAN DESIGNFi

g: „G

rün

mac

ht S

chul

e“ a

nd S

abin

e A

ndre

sen

EXAMPLE: SCHOOL YARDS

Summary

Several challenges for stormwater management in Hamburg related to climatechange

Technical measures, various projects and extensive planning and informationtools infrastructure adaptation

Not only stormwater quantity but also quality is gaining in importance

Cooperation between water utility and stakeholders in urban planning is crucialfor a successful adapation strategy towards blue-green infrastructure

THANK YOU FOR YOUR ATTENTION

CHRISTIAN GÜNNERPhone: +49 40 7888 82000Christian.Guenner@hamburgwasser.de