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8/11/2019 K LEEInKeun Seoul - River Project
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ICLEI 2006 1
Dr In Keun LEE
Director General / Office of Waterworks
Formerly Cheong Gye Cheon Project
Seoul Metropolitan Government
Cheong Gye Cheon Restoration Project
- a revolution in Seoul -
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ICLEI 2006 2
Before After
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ICLEI 2006 3
Introduction Seoul and Cheong Gye Cheon
Cheong Gye Cheon 2002 The Restoration Project
Background
Outline Challenges
Progress
Cheong Gye Cheon 2005
Final Remarks
Content
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ICLEI 2006 4
Introduction
- Seoul and Cheong Gye Cheon
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ICLEI 2006 5
Seoul at a glance
City Centre
Han river
Capital city of Korea for over 600 years
Area : 605.6 km2
Population : 10.3 M
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ICLEI 2006 6
Cheong Gye Cheon
Catchment area: 61 km2
Length: 13.7 km
Width: 20~85 m
CheongCheong GyeGyeCheonCheonCBD
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ICLEI 2006 7
Old map of Seoul
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ICLEI 2006 8
Early 20C
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ICLEI 2006 10
Solution: covering
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ICLEI 2006 11
Covering work
(1958~1977)
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ICLEI 2006 12
Cheonggye Highway
(1967~1971)
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ICLEI 2006 13
Highway in 1990s
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ICLEI 2006 14
Cheong Gye Cheon 2002
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ICLEI 2006 15
Cheong Gye Cheon Area
Building: over 6,000
over 100,000 small shops
Nations biggest commercial area
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ICLEI 2006 16
Cheong Gye Cheon Area
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ICLEI 2006 17
Declining old CBD
CBD redevelopment stopped where the Ch
eonggye Expressway started
Population and employment reduced
Population: 40,000
Employment: 80,000 in 10 years
Business headquarters moved to Gangnam
(new sub-center)
Industries in CBD lost competitiveness
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ICLEI 2006 18
Safety problem
Over all C
, partially D
or E
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ICLEI 2006 19
Safety problem
Only small cars were allowed from 1997Maintenance cost soared:US$50M (
94~
99)
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ICLEI 2006 20
The Restoration Project
- Outline
- Challenges
- Progress
-- Background
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ICLEI 2006 22
Why restore?
Paradigm shift of urban management
Development High quality of life
Environment-friendly city
Fundamental solution to safety problem
Recovery of history and culture
Revitalisation of downtown area Balanced regional development
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ICLEI 2006 23
The Restoration Project
- Background
- Challenges
- Progress
- Outline
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ICLEI 2006 24
Site location
Section 2 (L=2.1km) Section 3 (L=1.7km)Section 1 (L=2.04km)
Total length: 5.84 km
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ICLEI 2006 25
Demolition
Covered structure and highway: 5.4 km Waste (concrete+asphalt): 872,400ton (96% recycled)
Step 1 Step 2 Step 3
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ICLEI 2006 26
River design
Design CriteriaSatisfy with the 2ndgrade local river standard
Secure the stream capacity for 200 years frequency rainfall (118mm/hr)
Flood Level: estimated by numerical model and corrected using hydrau
lic model test
HWL (200yrs)
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ICLEI 2006 27
Water supply
Waterway plan
Width: more than 20% of main waterway width
Depth: more than 40 cm
Flow velocity: 0.24 m/sec
Measures to prevent water loss
Water supply plan
Water from the Han river: 120,000 ton/day
Underground water from subway stations: 22,000 ton/day
Water quality: better than the 2ndgrade
BOD: 3mg/l or less
SS: 25 mg/l or less
DO: 5 mg/l or less
Total N: 10 mg/l or less
Total P: 1 mg/l or less
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ICLEI 2006 28
Sewer system
Design Criteria
Combined sewer system for rainfall and wastewater
Capacity : 3 times of estimated wastewater
Combined Sewer System
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ICLEI 2006 29
Bridge design
Design CriteriaMinimize flow resistance
Create as cultural places - artistic landmark
Number of bridges: 22
International concept design competition
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ICLEI 2006 30
Landscape design
Concepts
New green belt with waterfront: West to East
Gradual transformation from urban landscape to natural environment
Create ecological biotop and environment
Thematic places: waterfall and fountains
History
NatureCulture + Urban
A B C
Upstream Downstream
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ICLEI 2006 32
The Restoration Project
- Background- Outline
- Progress
- Challenges
Ch ll 1
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ICLEI 2006 33
Challenge 1: Transport
Cheonggye road & hwy
Urban backbone corridor
170,000 vehicles/day
Traffic disaster warned
Media, interest group
Traffic simulation
Project delay
S l ti t t t
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ICLEI 2006 34
Solutions to transport
Discourage driving cars in the city centre
Improve traffic system
Cheong Gye Cheon area
Metropolitan area
Improve public transport system
subway system
bus only lane
Ch ll 2
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ICLEI 2006 35
Challenge 2: Neighboring merchants
Traffic congestion : access difficulty
Noise & dust due to construction
Business decline
S l ti t h t
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Solutions to merchants
Detailed survey on the markets and continuous interviews
consultation offices at the markets
regular meeting on the project
Minimize inconvenience for business activity
state-of-the-art technology
provide parking space nearby
S l ti t h t
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ICLEI 2006 37
Stimulate business activity
Reduce parking fee
Improve parking system for loading & unloading
Promote Cheong Gye Cheon stores
Financial support and subsidies Low-interest loans
Grants for the market remodeling
Special arrangement for street vendors
Special business centre in a outer area
Solutions to merchants
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ICLEI 2006 38
The Restoration Project- Background
- Outline
- Challenges
- Progress
Project delivery
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ICLEI 2006 39
Project delivery
Targets Keeping the schedule
Best value for moneyDetails of contract: Design-build contract
invitation for bid: Feb 2003 bidding: June 2003 starting work: 1 July 2003 three construction sections
Original project budget (
03): US$357M
Final adjusted amount (05): US$386M (+8%)Original project period:
1 July 03 ~ 30 Sep 05 (27 months)
Construction progress
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ICLEI 2006 40
Construction progress
Started on 1 July 2003
Construction progress
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ICLEI 2006 41
Construction progress
Stage 1: Scaffolding (July 2003)
Construction progress
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ICLEI 2006 42
Construction progress
Stage 2: Highway demolition (Aug 2003)
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Construction progress
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ICLEI 2006 44
Construction progress
Stage 4: Sewer, road & bridge construction (Sep 2004)
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Test running & Final touch
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ICLEI 2006 47
Test running & Final touch
June ~ September 2005
Grand opening
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ICLEI 2006 48
Grand opening
1 October 2005
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TrafficChanges
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ICLEI 2006 51
Speed in CBD
Morning peak: 17~18 km/hr
Evening peak: 12 km/hr
not very much worsened
Car in/out flow
1.56M 1.27M (-18.6%)
Subway ridership Central area: +13.7%
EnvironmentChanges
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ICLEI 2006 52
Air
No2
: 69.7 46.0 ppb (-34%)
PM10: 74.0 60.0 g/m3 (-19%)
Water quality
BOD: 100~250 1~2 ppm
Noise level reduced
Heat island effect relieved
Wind corrider created
Cooling effectChanges
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ICLEI 2006 53
g
Thermal image27 July 2005
28o 36o
37o 36o
Average 32.7oC
Cheong Gye CheonAverage 36.3oC
Nearby street
-3.6oC
Environmental improvementChanges
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ICLEI 2006 54
0% 25% 50% 75% 100%
Wind
Daylight
Odour
Noise
Water
Air
V improved
ImprovedUnchanged
Public survey (Nov 2005)
Ecology: FishesChanges
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3 14 species
Ecology: BirdsChanges
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18 species
Ecology: InsectsChanges
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7 41 species
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Final Remarks
Most preferred destination
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Future of Cheong Gye Cheon
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Identity as the 600 yr old Ca
pital Harmony between preservati
on & development
Economic vitality
Pedestrian oriented street system
International standard business district
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Virtual Tour
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