STORMWATER MANAGEMENT IN HAMBURG · HAMBURG: A GROWING CITY 1800 1860 1910 1955 2012 Source: E....

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

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Ko

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Fin

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QT

Ins

titutio

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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

THANK YOU FOR YOUR ATTENTION

JULIA DÖRING

Phone: +49 40 7888 83284

julia.doering@hamburgwasser.de