The nonpoint pollutants in the country is expected to account for about 65-70% of river pollution load in 2015. Accordingly, The importance of nonpoint pollution source management has increased. The parking lot is usually pollution source because the surface is consisted of a impermeable area. There...
The nonpoint pollutants in the country is expected to account for about 65-70% of river pollution load in 2015. Accordingly, The importance of nonpoint pollution source management has increased. The parking lot is usually pollution source because the surface is consisted of a impermeable area. Therefore, The application and necessity of Low Impact Development become a worldwide sensation and a ministry of environment make mandatory the application of LID technology for the development of business during the promotion. A monitoring has been conducted on the grass block parking lot one of the LID techniques from September 2013 to August 2014 in order to analyze characteristics of the discharge of nonpoint pollutants produced from the rain and to utilize as basic data for the management of them. Also, the purpose of this study is to estimate the reduction efficiency of rainfall runoff that compared to the asphalt parking lot. Water quality was analyzed on the basis of BOD, CODMn, TOC, TSS, T-N, NH4-N, NO2-N, NO3-N, T-P, PO4-P, Total Pb, Total Cu, Total Cr3+, Total Fe, Total Ni, Total Cd according to Standard Method and samples were taken during storm-water runoff. The average pollutants load of the grass block parking lot was lower than BOD 61%, CODMn 69%, TOC 63%, TSS 78%, T-N 80%, T-P 71%, Total Pb 75%, Total Cu 79%, Total Cr 61%, Total Fe 77%, Total Ni 70%, Total Cd 74% as compared to the asphalt parking lot. Because the grass block parking lot were reduced contaminant by filter, adsorption of soil and vegetation. The runoff occurred to average 80% of total rainfall volume, time of concentration of average 39 minute and accumulated rainfall of 2.3~3.4 mm in the asphalt parking lot. However, the runoff occurred to 12~45% of total rainfall volume, time of concentration of average 117 minute and accumulated rainfall of 7.0~10.5 mm in the grass block parking lot. Therefore, the grass block parking lot was found out first flush storage effect and rainfall runoff delay effect. Total soil volume of the grass block parking lot is 2673.0 m3 and the maximum detention storage using the porosity and saturation during rainfall is 664.2 m3. Therefore, the grass block parking lot was competent to retain 89.5 mm of accumulated rainfall . Also, the grass block parking lot was competent to retain approximately 56% of the rainfall events in case that 22.4 mm of accumulated rainfall corresponding to 80% of the rainfall frequency for 10 years in Changnyeong-gun.
The nonpoint pollutants in the country is expected to account for about 65-70% of river pollution load in 2015. Accordingly, The importance of nonpoint pollution source management has increased. The parking lot is usually pollution source because the surface is consisted of a impermeable area. Therefore, The application and necessity of Low Impact Development become a worldwide sensation and a ministry of environment make mandatory the application of LID technology for the development of business during the promotion. A monitoring has been conducted on the grass block parking lot one of the LID techniques from September 2013 to August 2014 in order to analyze characteristics of the discharge of nonpoint pollutants produced from the rain and to utilize as basic data for the management of them. Also, the purpose of this study is to estimate the reduction efficiency of rainfall runoff that compared to the asphalt parking lot. Water quality was analyzed on the basis of BOD, CODMn, TOC, TSS, T-N, NH4-N, NO2-N, NO3-N, T-P, PO4-P, Total Pb, Total Cu, Total Cr3+, Total Fe, Total Ni, Total Cd according to Standard Method and samples were taken during storm-water runoff. The average pollutants load of the grass block parking lot was lower than BOD 61%, CODMn 69%, TOC 63%, TSS 78%, T-N 80%, T-P 71%, Total Pb 75%, Total Cu 79%, Total Cr 61%, Total Fe 77%, Total Ni 70%, Total Cd 74% as compared to the asphalt parking lot. Because the grass block parking lot were reduced contaminant by filter, adsorption of soil and vegetation. The runoff occurred to average 80% of total rainfall volume, time of concentration of average 39 minute and accumulated rainfall of 2.3~3.4 mm in the asphalt parking lot. However, the runoff occurred to 12~45% of total rainfall volume, time of concentration of average 117 minute and accumulated rainfall of 7.0~10.5 mm in the grass block parking lot. Therefore, the grass block parking lot was found out first flush storage effect and rainfall runoff delay effect. Total soil volume of the grass block parking lot is 2673.0 m3 and the maximum detention storage using the porosity and saturation during rainfall is 664.2 m3. Therefore, the grass block parking lot was competent to retain 89.5 mm of accumulated rainfall . Also, the grass block parking lot was competent to retain approximately 56% of the rainfall events in case that 22.4 mm of accumulated rainfall corresponding to 80% of the rainfall frequency for 10 years in Changnyeong-gun.
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#Low Impact Development EMCs the grass block parking lot stormwater runoff nonpoint pollution source
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