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Cheong gye cheon restoration project

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  • 1. 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 -
  • 2. ICLEI 2006 2 Before After
  • 3. 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
  • 4. ICLEI 2006 4 Introduction - Seoul and Cheong Gye Cheon
  • 5. ICLEI 2006 5 Seoul at a glance City Centre Han river Capital city of Korea for o ver 600 years Area : 605.6 km2 Population : 10.3 M
  • 6. ICLEI 2006 6 Cheong Gye Cheon Catchment area: 61 km2 Length: 13.7 km Width: 20~85 m CheongCheong GyeGye CheonCheon CBD
  • 7. ICLEI 2006 7 Old map of Seoul
  • 8. ICLEI 2006 8 Early 20C
  • 9. ICLEI 2006 9 Problem: sanitation
  • 10. ICLEI 2006 10 Solution: covering
  • 11. ICLEI 2006 11 Covering work (1958~1977)
  • 12. ICLEI 2006 12 Cheonggye Highway (1967~1971)
  • 13. ICLEI 2006 13 Highway in 1990s
  • 14. ICLEI 2006 14 Cheong Gye Cheon 2002
  • 15. ICLEI 2006 15 Cheong Gye Cheon Area Building: over 6,000 over 100,000 small shops Nation’s biggest commercial area
  • 16. ICLEI 2006 16 Cheong Gye Cheon Area
  • 17. 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
  • 18. ICLEI 2006 18 Safety problem Over all “C”, partially “D”or “E”
  • 19. ICLEI 2006 19 Safety problem Only small cars were allowed from 1997 Maintenance cost soared: US$50M (’94~’99)
  • 20. ICLEI 2006 20 The Restoration Project - Outline - Challenges - Progress -- Background
  • 21. ICLEI 2006 21 Decision to restore: July 2002
  • 22. 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
  • 23. ICLEI 2006 23 The Restoration Project - Background - Challenges - Progress - Outline
  • 24. 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
  • 25. ICLEI 2006 25 Demolition Covered structure and highway: 5.4 km Waste (concrete+asphalt): 872,400ton (96% recycled) Step 1 Step 2 Step 3
  • 26. ICLEI 2006 26 River design Design Criteria • Satisfy with the 2nd grade 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)
  • 27. 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 2nd grade • 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
  • 28. ICLEI 2006 28 Sewer system Design Criteria • Combined sewer system for rainfall and wastewater • Capacity : 3 times of estimated wastewater Combined Sewer System
  • 29. ICLEI 2006 29 Bridge design Design Criteria • Minimize flow resistance • Create as cultural places - artistic landmark Number of bridges: 22 International concept design competition
  • 30. 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 Nature Culture + Urban A B C Upstream Downstream
  • 31. ICLEI 2006 31 Historic relics restoration Basis Preserve or restore historic relics Consider current situation: flood, traffic, merchants Involve specialists Site survey: Feb 2003 to June 2004 Restore 600 year old bridge: Gwangtong gyo 150 m upstream from the original site Restore Supyo gyo and Ogansu gyo: future plan
  • 32. ICLEI 2006 32 The Restoration Project - Background - Outline - Progress - Challenges
  • 33. 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
  • 34. 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
  • 35. ICLEI 2006 35 Challenge 2: Neighboring merchants Traffic congestion : access difficulty Noise & dust due to construction Business decline
  • 36. ICLEI 2006 36 Solutions to merchants Detailed survey on the markets and continu ous interviews consultation offices at the markets regular meeting on the project Minimize inconvenience f or business activity state-of-the-art technolog y provide parking space nea rby
  • 37. 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
  • 38. ICLEI 2006 38 The Restoration Project - Background - Outline - Challenges - Progress
  • 39. ICLEI 2006 39 Project delivery Targets Keeping the schedule Best value for money Details 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)
  • 40. ICLEI 2006 40 Construction progress Started on 1 July 2003
  • 41. ICLEI 2006 41 Construction progress Stage 1: Scaffolding (July 2003)
  • 42. ICLEI 2006 42 Construction progress Stage 2: Highway demolition (Aug 2003)
  • 43. ICLEI 2006 43 Construction progress Stage 3: Covered road demolition (Jan 2004)
  • 44. ICLEI 2006 44 Construction progress Stage 4: Sewer, road & bridge construction (Sep 2004)
  • 45. ICLEI 2006 45 Construction progress Stage 5: Landscaping for the recovered area (May 2005)
  • 46. ICLEI 2006 46 First water supply 1 June 2005
  • 47. ICLEI 2006 47 Test running & Final touch June ~ September 2005
  • 48. ICLEI 2006 48 Grand opening 1 October 2005
  • 49. ICLEI 2006 49 Cheong Gye Cheon 2005
  • 50. ICLEI 2006 50 Monitoring Monitor the changes due to the project from Jan 2003~Mar 2006 before, during and after the project Monitoring areas Land use CBD Industry Environment Ecology Traffic Real estate Changes
  • 51. ICLEI 2006 51 Traffic 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% Changes
  • 52. ICLEI 2006 52 Environment Changes Air No2: 69.7 46.0 ppb (-34%) PM10: 74.0 60.0 μg/m3 (-19%) Water quality BOD: 100~250 1~2 ppm Noise level reduced Heat island effect relieved Wind corrider created
  • 53. ICLEI 2006 53 Cooling effect Thermal image 27 July 2005 Changes 28o 36o 37o 36o Average 32.7oC Cheong Gye Cheon Average 36.3oC Nearby street -3.6oC
  • 54. ICLEI 2006 54 Environmental improvement 0% 25% 50% 75% 100% Wind Daylight Odour Noise Water Air V improved Improved Unchanged Public survey (Nov 2005) Changes
  • 55. ICLEI 2006 55 Ecology: Fishes Changes 3 14 species
  • 56. ICLEI 2006 56 Ecology: Birds Changes 18 species
  • 57. ICLEI 2006 57 Ecology: Insects Changes 7 41 species
  • 58. ICLEI 2006 58 Final Remarks
  • 59. ICLEI 2006 59 Most preferred destination
  • 60. ICLEI 2006 60 Future of Cheong Gye Cheon Identity as the 600 yr old Ca pital Harmony between preservati on & development Economic vitality Pedestrian oriented street s ystem International standard busin ess district
  • 61. ICLEI 2006 61 Effects of the Project Changes in the urban management paradigm Historic restoration Nature & ecological restoration CBD regeneration Good example of solving conflicts over a public project successful project management
  • 62. ICLEI 2006 62 Virtual Tour
  • 63. ICLEI 2006 63 Further information http://english.seoul.go.kr/cheonggye/ iklee@seoul.go.kr Thank you for your attention!

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