Sustainable stormwater management and green infrastructure in Fornebu, Norway

General

National Id:

Norway_01

Site name:

Fornebu

The in-depth description of the case study:

cs-nor-01-final_version.pdf

RBD code:

NO5101

Transboundary:

Data provider:

Martyn Futter SLU

Source(s):

Sustainable stormwater management at Fornebu “ from an airport to an industrial and residential area of the city of Oslo, Norway

From airport to sustainable community sustainable Fornebu

The aesthetic performance of urban landscape-based stormwater management systems: a review of twenty projects in northern Europe

NWRM(s) implemented in the case study:

Longitude:

10.6229

Latitude:

59.9019

Site information

Climate zone:

cool temperate moist

Mean rainfall:

778

Mean rainfall unit:

mm/year

Average temperature:

Mean evaportranspiration:

200

Mean evaportranspiration unit:

mm/year

Mean runoff:

0,00256849313154817

Mean runoff unit:

600 - 750 mm

Average imperviousness:

Type:

Actual Test Site

Light or indepth?:

In-depth

Average slope range:

0-1%

Vegetation class:

grass/turf

Monitoring maintenance

Administrative annual cost information:

Administrative costs are not known

Biophysical impacts

Information on retained water:

The total retained volume of water is hard to assess as the Fornebu plan consists of multiple NWRM and Green Infrastrucutre measures

Increased water storage:

230

Increased water storage unit:

m3/ha

Information on runoff reduction:

Large qualitiative reductions in runoff peaks could be expected

Information on Peak flow rate reduction:

Large qualitative reductions in peak flow could be expected when compared to the old Fornebu airport

Water quality overall improvements:

Positive impact-WQ improvement

Information on Water quality overall improvements:

based on mdeolling results and design criteria

Water quality Improvements Phosphorus (P):

Water quality Improvements (P) unit:

% reduction pf pollutant

Water quality Improvements Nitrogen (N):

Wq Improvements n unit:

% reduction pf pollutant

Water quality Improvements Total Suspended Solid (TSS):

Water quality Improvements (TSS) unit:

% reduction pf pollutant

Water quality Improvements Copper (Cu):

Water quality Improvements (Cu) unit:

% reduction pf pollutant

Water quality Improvements Zinc (Zn):

Water quality Improvements (Zn) unit:

% reduction pf pollutant

Soil quality overall soil improvements:

Positive impact-SQ improvement

Information on Soil quality overall soil improvements:

improvements related mainly to brownfield cleanup and removal of 200000m3 contaminated soil

Information on Soil quality overall soil pollution:

brownfield improvement included removal of contaminated soil, PAH, oil and deicing fluids were all problems

Lessons, risks, implications...

Key lessons:

Success was dependent on communication between different levels of government and a clear vision for a sustainable, multi-use urban environment

Success factor(s):

Type	Role	Comments
Attitude of decision makers
Attitude of relevant stakeholders
Financing possibilities

Financing:

Type	Comments
National funds
Local funds

Barrier:

Type	Role	Comments
Lacking coordination between authorities

Driver:

Type	Role	Comments
Organisation committed to it	main driver

Socio-economic

Direct benefits information:

The Fornebu brownfield redevelopment has clear direct benefits as it provides space for living, employment and recreation in a crowded urban area. The specific benefits of the NWRM in Fornebu are harder to quaknitfy as they cannot really be considered in themselves but must be seen as part of the complete redevelopment picture.

Ancillary benefits information:

Key ancillary benefits include more living space and a sustainable multi use urban environment supporting recreation, residential and industrial land use.

Costs investment information:

Total investment cost is not known

Costs land acquisition information:

No land acquisition costs as land was already owned by Norwegian government

Costs operation maintenance:

unknown

Costs total information:

Total cost is not known

Ecosystem improved biodiversity:

Information on Ecosystem improved biodiversity:

more aquatic habitat and greenspace

Ecosystem erosion control:

Policy, general governance and design targets

Policy pressure:

Policy requirement directive:

Policy impact:

Policy wider plan:

Policy area:

Policy target:

Target purpose
Runoff control
Peak-flow reduction
Increase Water Storage
Groundwater Recharge
Pollutants Removal
Improved Biodiversity
Oher Societal Benefits

Design & implementations

Application scale:

City

Performance timescale:

Immediate

Area (ha):

340

Area subject to Land use change or Management/Practice change (ha):

340

Size unit:

Design capacity description:

The systems were designed based flows expected with a 1 year return period for channels and a 20 year return period for detention ponds. The average runoff was based on estimates of daily summer rainfall between 1957 and 1995. The wet ponds had design criteria of 230 m3 per effective hectare.

Basis of design:

The NWRM are deisgned to treat a range of events with return times ranging from 1 to 20 years. Design criteria are based on long-term average summer rainfall.

Constraints:

Winter conditions, snow and ice are a challenge to the implmentation of sustainable urban drainage systems at Fornebu and other northern cities.

Favourable preconditions:

Having a brownfield site and a governance environment favorable to sustainable multi use urban landscape were key factors in the success of Fornebu.

Crop rotation:

none

Design contractual arrangement:

Design consultation activity:

Design land use change:

Land use change type
Discontinuous urban fabric

Design authority:

Authority type	Role	Name	Comments
Other	Determination of design details of the measure	City of Oslo
Other	Determination of design details of the measure	Municipality of Baerun
Other	Initiation of the measure	Statsbygg	Statsbygg is the Norwegian Directorate of Public Construction and Property
Other	Implementation	Statsbygg
Other	Financing	Statsbygg

Last updated: 18 Jun 2015 | Top

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Sustainable stormwater management and green infrastructure in Fornebu, Norway

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