HOV INBEKKENfrom Pipe to PublicThe Oslo School of Architecture and Design : Diploma Spring 2012 : Insitute of Urbanism and Landscape : Randi Engan

Re-opening of the river through an infrastructural node in Oslo. Water treatment and storage design.

Re-introduce nature to the city and recover continuity of water and green structures.

Former local waste depot by Sognefjorden, Vik i Sogn, 1985.

Hovinbekken, Oslo 2012.

LANDSKAP MED GRAVEMASKINER

De spiser av skogene mine.Seks gravemaskiner kovm og spiste av skogene mine.Gud hjelpe mig for ein skapning på dem. Hoderuten øyne og øynene i baken.

De svinger med kjeftene på lange skaftog har løvetann i munnvikene.

De eter og spytter ut, spytter ut og eter,for de har ingen strupe mer, bare en digerkjeft og en rumlende mave.Er dette et slags helvete?

For vadefugler. For de altfor klokepelikaner?

De har blindede øyner og lenker om føttene.De skal arbeide i århundrer og tygge blåklokkeneom til asfalt. Dekke dem med skyer av fet ekshaustog kald sol fra projektører.

Uten struper, uten stemmebånd og uten klage. Rolf Jacobsen, Hemmelig liv, 1954.

M 1:100 000

Oslo S

Nesodden

Økern

Maridalsvannet

Bogstadvannet

Akerselva

Øyungen

2,5 m

stormwater

road runoff Culvert

2,5

m

Very low

Wat

er q

ualit

y

In h

eavy

rain

fall,

Hov

inbe

kken

is

rece

ivin

g se

wage

in th

e are

a of Ø

kern

.

Good

Økern

Ensjøbyen

Kampen

Bjerkedalen

Årvoll

Årvollåsen

Trollvann

Risløkka

Hovin

GrønlandOslo S

M 1:20 000

Open riverPiped river

N

River and stormwater are piped underground and released into Akerselva before it enters the harbour of Bjørvika.

The watershed of Hovinbekken covers an area of

11,1 km². Hovinbekken is the most polluted waterway of Oslo.

16 thresholds lead sewage to Hovinbekken in heavy rainrall and in malfunctions.

45 pipes lead stormwater directly to the piped river.

Upstream Økern, the river has a good water quality as it runs partly open. The river goes into the culvert at Økern and after this the water quality turns to very low. The rivers ability to self-clean is decreased due to lack of contact with light, air and vegetation.

Pedestrian tunnel.Part of the “green structure” crossing Økern. The tun-

nel goes under a roundabout that is part of the new road structure. Økern T-bane station.

Walking next to the T-bane tracks.

Low point.Runoff collected from roads and other non-pervous sur-

faces goes into underground pipes leading to Hovinbekken.

Ulvenveien passes under the railway. Closed off industrial site.Impermeable surfaces.Økern is covered mainly with asphalt and concrete.

Hovinbekken at Risløkka.The stream runs open through areas of single family houses.

Kids play and build bridges and houses in the trees above the water.

Site for re-opening. Hovinbekken runs in a culvert under this industrial area.

T-bane going south from Risløkka towards Økern.

Pedestrian underpass.

1110

12

16

13

17 18 19

14 15

9

Aerial view of railway and the area south of Økern centre.

Green structure.

Stop.Økerns first priority is cars.

Impermeable surfaces.

Alnabanen.The railway for freight traffic is connected to the Alnabru

Terminal and goes through the middle of Økern.

Industrial storage.arge area are used for storing equipment for excavators.

Green structure. Økern Senter.The high building will remain in the new

future situation of Økern centre.1

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3

4

5 6 7 8

TB

B

B

B

B

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1918

1612

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500 m

400 m

300 m

200 m

100 m

Water, rail and main roads 1938. Water, rail and main roads 2000. Water, rail and main roads 2015.

Teglverkstomta. Hovinbekken will be re-opened down-stream of Økern. New school and kindergarden.

Infrastructural transformation. Ring 3 and Øster Aker vei are put in a tunnel. Ulvenveien becomes the new local road.

Runoff water from the new roads goes untreated directly to Hovinbekken!

Hovinbekken in culvert (dashed line) and original waterways of Hovinbekken and Refstadbekken.

Pressure. Økern Senter will be transformed around a node into a residential area with shopping, culture, business and living.

Green structure and trails.D2 from centre towards Bjerke.D3 from centre towards Risløkka and Linderud.

Site for re-opening Hovinbekken. Current buildings: industry and storage.

D2

D3D2

50 m

T

B Bus node

T T-bane station / Økern senter

B

1

1 Lead the water along the T-bane tracks.

Hovinbekken existing culvert

2 Integrate the river in the existing pedestrian/bicycle underpass.

3 Fill up the underpass. The existing road, which is a low point, becomes an expansion of Hovinbekken.

4 Open up new connections to the T-bane and to Økern senter.

5 A new underpass next to the river.

6 Water as the main attraction. Retaining, bu�ering, draining. Emergency �ooding areas / multiple land-use, winter as summer.

7 Connect to the ongoing re-opening project at Teglverk-stomta.

8 Existing green structure.

9 Connection to Lørenbyen / Haslevangen.

10 Re-use / remove industrial buildings.

11 Re-value infrastructural left overs.

2

11

3

4

56

7

9

8

10

january49 mm

february36 mm

march47 mm

april41 mm

may53 mm

june65 mm

july81 mm

august89 mm

september90 mm

october84 mm

november73 mm

december55 mm

Økern is covered by 80-90 % hard surfaces which give 60-70 % runoff.

More extreme weather and higher peaks.

Winter

145 mm

180 mm

146 mm

248 mm

Normal 1961-1990Forecast 2071-2100

273 mm

157 mm

233 mm

205 mm

Spring Summer Fall

Wetland catches water that excess the

limits of the storm

water treatment system

.

Existing culvert becomes an

emergency exit in �ood events.

Existing pipes leads the over�ow from stormwater

treatment to the �oodable wetland.

Storage and sedimentationRelease

Treatment

RiverCulvert

Local stormwater treatment > raingardens> urban runo�> road/highway runo�

Floodable landscape

�re

shol

d

Treatment pond collecting road runo� from the highway.

River and pipe conceptAs the river gets opened and creates a new waterway, the existing culvert functions as an emergency gateway in flood events and as a system collecting the excess water from local treatment sites.

Excess water goes into a wetland to be treated before it reaches the river. By building up thresholds, a multi functional landscape can temporary hold and store water in flood events.

The concept can be applied further downstream of Økern using the exixting culvert.

0,26

0,30

0,90

0,760,76

0,11

0,26

0,61

3 m

1 m²

9 m²0,3 m

thresholds

sediment pond

Storage design principle. Hydraulic efficiency

HIGH LOW

Water treatment wetland.

C

C´

D

E

F

F´

E´

D´

B

A

A´

B´

Runo� from Ring 3 will be lead into a sediment pond and treated in a wetland at a site which currently is vacant. Existing pipe is extended.

Proposed underpass.Continuous promenade along Hovinbekken goes under Ring 3.

Proposed connection towards Økern Sentrum and Løren.

To allow the �sh to move upstream, thresholds are maximum 50 cm high.

Existing industrial building is proposed transformed into residential. First �oor with café and public functions facing the riverfront.

A threshold can be used to temporary hold water in �ood events, preventing �ooding downstream.

Play ground.

Polluted runo� from the surfaces around the gas-station is proposed stored and treated before it reaches the river. �e space available can also allow treating washing water.

Walk along the water. �e river is lead through the pedestrian tunnels.

Økern T-bane.

Perspective 1

Perspective 3

�e river is the base of a linear park along the T-bane. Existing culvert functions as an

emergency in �ood events.

Local raingardens collect the water at low points from roofs and surfaces within the new developments at Ulven.

wetland

Alnabanen

unde

rpas

s

path

waterfront

Østre Aker vei

Ulvenveien

Persveien

Ring 3

Perspective 2

Perspective 4

M 1:1000

Pipe

Culvert

Watersheds

Water storage/treatment

Floodable area

+96

+97,5

+97

+98

+92

+93,5

+91,5+91+90,5

+90+89,5

+89

+97

+88,5

+85

+83

+93

T

B

Safe

FloodNormal

Riverfront soft + hard edges.

Waterfront design principle. Dynamic: the place and the watefront changes as the water rises.

Bjørk / Betula pendulaOsp / Populus tremulaEik / Quercus roburLønn / Acer platanoides

White willow / Salix capreaIstervier / Salix pentandraHegg / Prunus padusStrandrør / Phalaris arundinacea

Kirsebær / Prunus serulataRogn / Sorbus aucuparia

Wetland

Urban planting

Eple / MalusPære / Pyrus communisPlomme / Prunus domesticaBjørnebær / Rubus fruticosus

Edible vegetation

Riverfront

Decidious forest

Dunkjevle / Typha latifóliaSverdlilje / Iris pseuacorus Kjempesøtgras / Glyceria maximaSjøsivaks / Schoenoplectus lacustris Bukkeblad / Menyanthes trifoliata Hvit nøkkerose / Nymphea alba

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green greenpromenade river T-bane road

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green T-bane green river+promenade

green

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85

underpassingpromenade

wetlandC - C´ river greengreen

95

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91

prome-nade in tunnell

river

1:200

98

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105

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Økern Senter green railway+bu�er

river promenade+riverfront

river o�ce buildingforestF - F´

98

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95

105

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101

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99

94

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o�ce building road railway+bu�er

river waterfront promenadelawnwetlandE - E´

Watersheds. Each watershed has a low point that collects the water.

Local storages hold stormwater and prevent it from reaching Hovinbekken. In a normal condition there will be constant waterbodies in the low points.

Maximum storage

Road runo�

Sidewalk treatment

Raingarden

Draining �eld

Permeable cover

Open ditch

Water slope

WaterplanProjected waterplan proposes a toolbox of five principles for storing and treating stormwater at Økern.

Through mapping the slopes and lower points in the landscape, the area is divided into different watersheds which each stores and collects stormwater in a low point. The waterplan is dynamic as each watershed gives space for changes in the waterlevel and for the waterbody to expand. As the water excesses the limits, the overflow goes into existing pipes leading to the wetland within the public park. In a normal condition, some of the treatment ponds will have a constant waterbody while others will be dry. In areas with more polluted runoff as from the highways, the water will be lead into sediment ponds before it is treated in a wetland. Together, the pattern of stormwater treatments enhances the urban ecology and pro-vide green open spaces.

Local raingarden collects water from roofs and nearby paved surfaces.In heavy rainfall and extreme situations the over�ow goes into existing pipes leading to a public treatment pond before it reaches the river.�e raingardens becomes a system of biotopes for birds, people, insects.

More nature, more pleasure.

Local road runoff storage and treatment.Storage-ponds for sedimentation along the road slow down the water and secure a constant �ow to treatment-ponds. When the pondes exceed capacity, the over�ow goes into existing culvert leading to a bigger treatment pond.

�e patches of treatment give valuable habitats to insects and amphibians.

Sidewalk stormwater treatment.Stores and treats runoff from streets and squares and creates space for blue and green in urban conditions with limited space for nature.

Permeable pavement.Allows a certain amount of water to infiltrate and keeps the functionality of a hard surface. Can be used on parking areas and other spaces that requires a hard surface for vehicles.

Filtrating ground.Water is allowed to filtrate under areas that can be used for recreation. Controls the amount of water released into the river.

Filtration

Wetland

River

Play fields

Storage and sedimentationTreatment

Local raingarden collects water from roofs and nearby paved surfaces.In heavy rainfall and extreme situations the over�ow goes into existing pipes leading to a public treatment pond before it reaches the river.�e raingardens becomes a system of biotopes for birds, people, insects.

More nature, more pleasure.

Local road runoff storage and treatment.Storage-ponds for sedimentation along the road slow down the water and secure a constant �ow to treatment-ponds. When the pondes exceed capacity, the over�ow goes into existing culvert leading to a bigger treatment pond.

�e patches of treatment give valuable habitats to insects and amphibians.

Sidewalk stormwater treatment.Stores and treats runoff from streets and squares and creates space for blue and green in urban conditions with limited space for nature.

Permeable pavement.Allows a certain amount of water to infiltrate and keeps the functionality of a hard surface. Can be used on parking areas and other spaces that requires a hard surface for vehicles.

Filtrating ground.Water is allowed to filtrate under areas that can be used for recreation. Controls the amount of water released into the river.

Filtration

Wetland

River

Play fields

Storage and sedimentationTreatment

TAKK!