With vehicle-propelled permeating dust being a major contributing source to the pollution of suspended particles in urban areas, and in light of the insignificant yield relying solely on controlling the fixed pollution sources, consequently curbside hosing has been adopted to reduce the pollution of suspended articles. The Chiayi Environmental Protection Bureau, in a bid to reduce the suspended dust in the city roadways and to maintain the cleanliness of the city roadways, which would curb the city’s air quality from deteriorating, has filed for subsidies with the Environmental Protection Administration to implement Chiayi City’s stepped-up street dust hosting project (the Project), in a move to achieve, through curbside hosing, the objectives of enhancing the cityscape and improving the air quality.
With the current report being the 2007 final report, the project covers an implementation period spanning from January to December 31, 2007, and provides curbside hosing work to 14 major and secondary roadways throughout the municipality, with an EPA assessed yearly curbside hosing length at 10,000k. The implementation tally results show that the project has completed a total curbside hosing of 10,994.6km, with a cumulative curbside hosing achievement ratio of 110%.
To go by a median curbside hosing speed of approx. 13.6km/hr, the median volume of water consumption per kilometer per month falls between 1.20 and 1.27, with an overall median at approx. 1.23 tons/km.
In the current year, a total of six water quality sampling of the curbside hosing water has been take for analysis, and the results show that the screenings have complied relevant standards.
The project has staged TSP and PM10 screenings, and the inspection results have not found any significant correlation to the curbside hosing work. In addition, the inspection results reveal that there is a higher pollutant reduction ratio with hosing first followed by sweeping than sweeping first followed by hosing, but it has not been as significant. As many factors affect airborne TSP and PM10, there are practical difficulties in terms of how best to gauge the pollutant reduction ratio of one curbside hosing work to a specific section of the road. Findings derived from the questionnaire survey show that the level how Chiayi City’s citizens perceive of air quality and roadway permeating dust falls under an exceedingly high level. With regard to the curbside hosing work, the general public has maintained an 80% satisfaction level.
The project’s tangible implementation results are as follows,
1.A most economic project
The 2007 plan has an underwriting funding of $2.285 million, with TSP and PM10 reduction volumes at 379.3 tons and 71.5 tons respectively, meaning the injection ofevery $10,000 is able to reduce 1.66 tons of TSP and 0.31 ton of PM10 to warrant an economic yield than anyother projects.
2.A most visible project
The project’s an instantaneous campaigning effect alongside the curbside hosing work, highlighting the environmental protection unit’s determination for maintaining and protecting the air quality, coupled with the implementation of the questionnaire survey, has made it a most visible project.
3.A high level of satisfaction and support
With the project holding questionnaire surveys over six years since it first commences, over the past six years, the average level satisfaction and support every year has exceeded eighty percent.
4.A high level of coverage ratio
With crucial roadways within the municipality’s jurisdiction spanning over 51.1 kms (those with a roadway span of 8m or wider), the length of curbside hosing totals to 36.7km, at an interval of 2 to 3 times per week, with a coverage ratio of as high as 42%. The high coverage ratio reaffirms thatthe project is highly ideal for implementation in Chiayi City, characterized by a dense population of limited land resources.
5.An enhancement of roadway grade
The Environmental Protection Administration has initially assess the city’s roadways of provincial roadways at 100%, county roadway class-A as 84%, class-B 13%, and class-c 3%; the inner city roadways of class-A at 69%, class-B 26%, and class-C 5%. Through the implementation of the project and the roadway census findings, the filing made so far comprise of provincial roadway of class-A at 100%, county roadway class-A at 86%, class-B 14%, and class-C 0%; inner city roadways of class-A at 71%, class-B 29%, and class-C 0%, as it not only provides a comprehensive enhancement to the roadway grades, but more important, it eliminates class-c roadways within the jurisdiction of the municipality. And once the EPA approves the filing, the results will become the project’s most dynamic performance.