27 terms

River restoration and conservation in damaged urban catchments

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River restoration
The process of managing previous damaged rivers to reinstate natural processes to restore biodiversity, providing benefits to both people and wildlife
River conservation
The protection, preservation, management, or restoration of wildlife and of natural resources such as forests, soil, and water.
Cheonggyecheon
River in Seoul which had been badly damaged in the past and was restored
5.8km
Length of river
1971
The year an Expressway was built in, that totally covered the river and prevented evapotranspiration, damaged river flows and enclosed the river system.
1918
Japanese administration dredge sediments out of the river and aimed to cover it over as the stream was viewed as a health and flood risk. Work halted because of WW2
Between 1958 and 1961
Stream completely covered over
2003
River restoration project launched to bring environmental benefits back to the river. Aims for an ecologically sensitive pedestrian corridor
$281m
Cost of restoration scheme launched in 2003
SUDS
Sustainable Urban Drainage System
Reasons for scheme
Improve quality of life of people in Seoul, the freeway was posing safety risks and needed repair, to increase business competitiveness and to improve the environment.
Years of neglect and development
Had left the stream nearly dry.
120,000 tons of water
were to be pumped in daily from the Han River, its tributaries, and groundwater from subway stations
Car use
Was discouraged during the scheme and rapid bus lanes were added
Bridges added
22 in total, including 12 pedestrian bridges and 10 motorist bridges to improve communications
Hanang River
source of water pumped into the Cheonggyecheon River to deal with variable flow rates and maintain a regular flow of 40cm depth. The [pumped in water is treated to prevent pollution
Historic central zone
Underground waterways were redirected and given a new stream bed and landscaped banks
Middle zone of the project
Has fountains and waterfalls to increase biological oxygen supply
Final zone
Stream allowed to widen and designed to look overgrown and wild
Hanang River
The end point of the Cheonggyecheon River where the river flows into a wetlands conservation area
18.1 million
Number of visitors by 2008
2.5°C
Reduction in average temperatures as a result of reducing the number of cars
Provides flood protection
for up to a 200-year flood event and can sustain a flow rate of 118mm/hr
24.5m
Seoul population
17,000
People per km2
Biodiversity Increased
By 639% between the pre-restoration work in 2003 and the end of 2008 with the number of plant species increasing from 62 to 308 and fish species from 4 to 25.
Cheonggyecheon Restoration Citizens' Committee
Gauged public opinion
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