LIVEABLE CITIES AND THE ECONOMIC IMPACT OF A CHANGING CLIMATEREDUCING FLOOD RISK THROUGH BLUE-GREEN INFRASTRUCTURE

USING WATER AND GREEN INFRASTRUCTURE AS THE DESIGN DRIVER FOR URBAN REDEVELOPMENT

COPENHAGEN -THE MOST LIVEABLE CITY IN THE WORLD

DRIVERS FOR GREEN INFRASTRUCTURE AND STORMWATER MANAGEMENT

• Green Infrastructure for Combined Sewer Overflow Control

• Long-Term Control Plans (LTCPs)/ACO’s for 772 cities

• Energy Independence and Security Act of 2007 (EISA)

• Federal Facilities

• LEED/Green Buildings

• New State and Federal Stormwater Regulations

• New Municipal Stormwater Permits

• Integrated Planning (wastewater and stormwater master plans)

• Enforcement Controls – EPA and States

• Administrative Consent Orders and Negotiated Permits

• TMDLs

OVERVIEW FOR THE USA

INCREASE IN EXTREME PRECIPITATION EVENTS

FM Global –Coping With Extremes, 2016

Increasing frequency of extreme precipitation events is a major risk facing US businesses

Source:

Climate Change Impacts in the US: The Third National Climate Assessment, 2014

COPENHAGENHAS ALSO BEEN FACING CHALLENGES DUE TO CLIMATE CHANGE……

EXTREME CLOUDBURSTS IN 2010 AND 2012….6.9 INCHES FELL IN 2 HOURS

Major economic losses due to closed transportation, limited mobility, and business closures in addition to direct flood damages

••Climate plan KK, 2009

••Extreme cloudburst 15 August 2010

••Climate adaptation plan, 2011

••Extreme cloudbursts 2 July and 15 August 2011

••Cloudburst plan, 2012

••Specific projects 2014 ->

COPENHAGEN CASEDRIVERS AND PROCESS

Change of Thinking The cost of doing nothing creates losses of $60 million a year (City of Copenhagen). Let’s create robust solutions that add value and mitigateCloudbursts. Parks are proven to increase property value 10-15% (Trust for Public Land).

• Cloudburst Planning

• Stakeholder Involvement

• Iterative• Multidisciplinary• Inclusive • Regulatory

Revisions

• 8 municipalities, 200 km 2

• 2 largest treatment plants in Denmark• Integrated hydraulic model covering 95 % of

sewers, combined and separate• Rivers, canals, lakes etc. • Process model of treatment plants• Hydrological model covering 300 km2 based

on GIS-maps and aerial photos• Digital elevation model

CLOUDBURST PLAN HOFOR AND CITYBASIS HYDRAULIC MODELS

DETAILED MASTER PLANS - RISK BASED MANAGEMENT CBA AND SOCIO-ECONOMIC MODELS

• Cost of direct damages from insurance companies

• Cost of direct damages from infrastructure owners, municipal buildings etc.

• Loss of revenue from shops, companies, traffic• Benefits from synergies• Document that co-finance projects are

cost efficient compared to traditional grey infrastructure

300 Projects Identified

Planning, Design and Construction over the next 20 years

SANKT JØRGENS LAKEHISTORICAL WATER SUPPLY – STORMWATER DETENTION

SKT JØRGENS SØ – CENTRAL RETENTION

SKT JØRGENS SØ – CENTRAL RETENTION

SKT JØRGENS SØ – CENTRAL RETENTION

SANKT ANNAE SQUARE1ST CLOUDBURST STREET IN COPENHAGEN

NEW YORK CITY SE QUEENS CLOUDBURST PILOT

PILOT PROJECTJAMAICA HOUSING

NYC PILOT PROJECT – SE QUEENSJAMAICA PUBLIC HOUSING

1 year 3 years 5-10 years 10-15 years Combined bluegreen solutions10 years

Effect of combined Blue Green solutions with conventional (grey) pipes

Keep Drainage Systems Reasonable and Cost-effectiveREDUCING INFRASTRUCTURE COSTS WITH BLUE GREEN SOLUTIONS