3-4 seoul korea

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Cheong Gye Cheon Restoration in Seoul, Korea Project Description • Demolition of covering and elevated structures: 5.4 km (3.4 miles) • formation of new watercourse and river bed: 5.7 km (3.5 miles) • water supply: 120,000 m3 (1,006,370 bbl)/day through a 10.9 km (6.8 miles) long pipeline • construction of bridges: 22 • landscaping: 5.8 km (3.6 miles)

design Precedents | Oct. 13, 2010 | SeungYen Hong

Before and After

Three Themed Restoration Sections & Water Supply Pipeline


History & Tradition


Culture & Modernity

Nature & Future

Han River

History • A century ago it was called ‘valley of clean water’ • 50s-60s: Urbanization and industrial development polluted the creek • 1967-76: The elevated highway was built to meet a demand of transportation for heavily industrialized city center • 80s: Due to economic decline of the central areas, the highway became unneccesary and concerns about air pollution, a health risk form unsanitary conditions, a decreasing stability of ageing structures increased • 90s: A group of academics and environmentalists developed a community-based master plan • 2002: Seoul Metropolitan Government launched an organization to move peoject forward

• To maintain an average depth of 0.4 m and average current velocity of 0.25 m/s, a daily supply of 120,000 m3 (1,006,370 bbl) is provided • The water supply consists of 100,000m3 (838,641bbl) extracted from the Han River,15 km away, and 20,000 m3 (167,728bbl) of groundwater


The original width of the stream was kept but the bed was lowered


• The twin combined sewer boxes in each bank help prevent raw sewage and contaminated initial storm run-off from overflowing into the river during storms (26-236ft)


Final Construction Costs Cost: $ milllion 346 3.6 44.4 77.3 60 21.4 84 46.9 8.4

• Clay mats and grout cut-off walls were used in the upstream section to limit water loss and scour

Removing the Freeway, Restoring the River

design Precedents | Oct. 13, 2010 | SeungYen Hong

Historic Restoration

Landscape Design & Restoration of Ecology

• Restoration of the old Gwang-Tong bridge • Ancient pillars which are remnants of the which had been buried under the covering former highway that occupied the space highway structure for four decades • The sloping embankment walls have been clad in granite to resemble a historic masonry wall.

• Small squares, works of art and waterfront decks have been provided

• The northern side of the river provides a promenade for people and the southern terrace is primarily for plants and wildlife