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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
