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 Expected Effects
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 Results of a survey regarding the restoration work |
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Citizens' appraisal |
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Regarding the restoration work, about seven (66.8%) out of the ten respondents to the survey made some positive remarks, with 77.6% of the respondents showing a positive forecast about the future prospect. There were owners of some businesses (especially those engaged in metal, machinery, manufacturing, retail/wholesale) located alongside complaining about a slowdown in their activities partly due to the restoration work. |
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Urban planning |
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According to an observation about the trend for land transactions and building construction in the Cheonggyecheon Stream area in 2004, it appears that the area remains less affected by the recession of the economy, compared to the areas close to Teheran-ro in Gangnam, which are being hit by the recession. |
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Urban industry |
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As for the impact of the restoration work on business activities in the area, the work had apparently a direct impact on their operating income/loss of the business, but hardly on their ways of doing business, size of business, and methods of logistics operation. No definite changes in rents and land prices are observed yet. |
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Transportation |
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1) Downtown transportation: As a result of making LOS-related comparisons about the status of downtown traffic flow in the pre-restoration work period and the post-commencement period, it appears that there is no definite difference either in the morning or in the afternoon over a five-month period. The downtown traffic flow pattern has apparently entered a stabilization stage despite of the progress in the restoration work.
2) Use of public transportation means: In the period following commencement of the restoration work, the number of Seoulites using a bus (based on those using traffic card) remains little changed. However, in the period following the reorganization of the public transportation system in July 2004, the number of Seoulites using a bus has increased by 11% from December 2003. The number of Seoulites using subway has increased by 6% (or 13.7% in downtown) from June the preceding year.
3) UAs for the impact of the restoration work on business activities in the area, the work had apparently a direct impact on their operating income/loss of the business, but hardly on their ways of doing business, size of business, and methods of logistics operation. No definite changes in rents and land prices are observed yet. urban industry
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Environment |
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1) Air pollution: According to a monitoring recording the air pollution in the area and other areas in Seoul, the overall level of air pollution shows a trend for decrease. Compared to the July ~ October 2002 period, the concentration of fine dust has shown a noticeable decrease (i.e. from 60㎍/㎥ to 55㎍/㎥) even before completion of the work. It has been also found out that, with the removal of the elevated highway over the stream, the number of vehicles entering downtown Seoul has shown a decrease of 2.3%, with the number of users of buses (by 1.4%) and subways (by 4.3% - daily average of 430,000 people) increasing drastically, supposedly having a positive influence on improving of the atmospheric environment.
2) Volatile Organic Compounds (VOCs) measured in the area: Since only 40-plus VOCs have been measured, with benzene and toluene, at five points in the Cheonggyecheon Stream area, in the March 24~28, 2004 period, it appears that the level of toluene dropped down, but those of benzene and ethyl-benzene increased a little bit, supposedly because of the congestion of the traffic nearby.
3) Noise level on roadside: After checking out the noise level on nearby roadsides in a three-month period during the restoration work, the level had been found out standing at 66.2dB(A)~ 71.6dB(A) in daytime and 60.4dB(A)~70.6dB(A) at night. This showed that the ongoing work did not considerably increase the noise level in the area. |
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| Changes in temperature |
With the water flowing in the stream, the temperature obviously goes down by up to 10~13%, i.e. by 3~4 degrees Centigrade during the hottest days of summer, when temperature goes up to 30¡Æ or higher. Before the restoration, the area was showing a temperature about 5 degrees higher than the average temperature of the city. According to a survey, with the removal of the elevated highway a wind passage had been engendered, causing a decrease in the temperature and the temperature went down even further with water flowing in the stream. The decrease in the number of vehicles passing by also contributed to the drop in the temperature. It is expected that the heat island phenomenon observed in the city will weaken even
further, with newly planted aquatic plants and trees growing in or around the stream.
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| Changes in wind passage |
| Densely built buildings in a city block the smooth flow of winds and make the atmospheric environment even worse. The heat island phenomenon used to be observed in the Cheonggyecheon Stream area under the impact from the heavy traffic, concentration of commercial facilities, and the impermeable soil surface. The streamside green areas, along with the removal of the elevated highway, will hopefully mitigate the phenomenon.
With the completion of the restoration work, the wind speed in the entire area has apparently become faster (i.e. by 2.2%~7.1%). The average wind speed measured at Chenggye 8-ga appeared to be up to 7.8% faster than before apparently under the influence of the cool air forming along the stream.
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