stormwater management in hamburg · hamburg: a growing city 1800 1860 1910 1955 2012 source: e....
TRANSCRIPT
STORMWATER MANAGEMENT IN HAMBURG
Julia Döring | 17 October 2019
AGENDA2
1 CHALLENGES WITH REGARD TO STORMWATER MANAGEMENT
2 HAMBURG‘S APPROACH TO STORMWATER MANAGEMENT
3 PROJECT RISA
4 SUMMARY & LESSONS LEARNED
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 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
HAMBURG‘S APPROACH TO STORMWATER MANAGEMENT6
Stormwater managementI. REDUCTION OF COMBINED SEWER OVERFLOWS
→ WATER PROTECTION PROGRAMMES
Continued water protection programmes referring to
several catchment areas
Adaptation of the combined sewer system
Source: Kompetenzzentrum Wasser Berlin gGmbH
HAMBURG‘S APPROACH TO STORMWATER MANAGEMENT7
I. REDUCTION OF COMBINED SEWER OVERFLOWS
→ WATER PROTECTION PROGRAMS
Continued water protection programmes referring to several catchment areas
Adaptation of the combined sewer system
II. REDUCTION OF FLOODINGS DUE TO CLOUDBURSTS
Multifunctional use of areas to prevent flooding
III. NEAR-NATURAL WATER CYCLE
Water-sensitive urban design
Development of extensive planning and information tools
Sewer system
II. REDUCTION OF FLOODINGS DUE TO
CLOUDBURSTS
Multifunctional use of areas to prevent
floodings
Source: Kompetenzzentrum Wasser Berlin gGmbH
HAMBURG‘S APPROACH TO STORMWATER MANAGEMENT8
I. REDUCTION OF COMBINED SEWER OVERFLOWS
→ WATER PROTECTION PROGRAMS
Continued water protection programmes referring to several catchment areas
Adaptation of the combined sewer system
II. REDUCTION OF FLOODINGS DUE TO CLOUDBURSTS
Multifunctional use of areas to prevent flooding
III. NEAR-NATURAL WATER CYCLE
Water-sensitive urban design
Development of extensive planning and information tools
III. NEAR-NATURAL WATER CYCLE
Water-sensitive urban design / sponge city
Development of extensive planning and
information tools
Source: Kompetenzzentrum Wasser Berlin gGmbH
9
FUNDED AND LED BY
• State Ministry for Environment and Energy
Behörde für Umwelt und Energie (BUE)
• HAMBURG WASSER
RISA
Source: Atelier DreiseitlSource: Atelier Dreiseitl
PROJECT RISA – RAIN INFRASTRUCTURE ADAPTION
PROJECT RISA – RAIN INFRASTRUCTURE ADAPTION
PROJECT OBJECTIVES
○ Part of the climate protection plan of the city of
Hamburg
○ Combination and synergies with the introduction of
an impervious area charge („stormwater fee“)
○ Flood protection
○ Water Protection (focus on separate system)
○ Near natural water balance
PROJECT DURATION: 9/ 2009 – 12/ 2015
(AND ONGOING)
10
PROJEKTORGANISATION
QT
Te
ch
nis
ch
e G
run
dla
ge
n
QT
Ko
ste
n &
Fin
an
zie
run
g
QT
Ins
titutio
ne
n &
Re
ch
t
QT
Ko
mm
un
ika
tion
& Ö
ffen
tlich
ke
it
Source: HAMBURG WASSER
RISA – WORKING METHOD
RESULTS AND MEASURES12
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
Source: HAMBURG WASSER
PROJECT EXAMPLES: FLOOD PROTECTION13
Sourc
e: L
GV
Sourc
e: H
am
burg
Wasser
Multifunctional use of areas
Public ParcRainwater Playground
Sporting Facility
Sourc
e: N
aum
ann
Landschaft
PROJECT EXAMPLE: WATER-SENSITIVE URBAN DESIGN
Fig
: „G
rün
ma
ch
t S
ch
ule
“ a
nd
Sa
bin
e A
nd
rese
n
SCHOOL YARDS
Sourc
e: U
lrich P
erre
y
Sourc
e: H
am
burg
Wasser
Sourc
e: H
am
burg
Wasser
Sourc
e: N
aum
ann
Landschaft
Sourc
e: H
am
burg
Wasser
Sourc
e: K
rafft
Angere
r
HAMBURG‘S GREEN ROOF STRATEGY: 100 HECTARES IN 10 YEARS15
Visualisation: TH Treibhaus Landschaftsarchitektur, aerial photograph: Matthias Friedel
SUMMARY & LESSONS LEARNED
Future-proof rainwater management operates in a field of tension between
investors, costs, space requirements and other aspects of urban planning
Cooperation between water utility and stakeholders in urban planning is
crucial for a successful adaption strategy towards blue-green infrastructure
Implementation of water-sensitive urban design is possible in existing
structures, combination with business-as-usual measures as promising
strategy
An uniform adaption strategy, technical fundamentals and experiences /
know-how are the basic elements
Implementation requires personnel capacity and political adaption
