Appropriate Methods in Determining the Event Mean
Concentration and Pollutant Removal Efficiency of a
Best Management Practice |
Marla C. Maniquiz1, Jiyeon Choi1, Soyoung Lee1, Hye Jin Cho2, and Lee-Hyung Kim1† |
1Department of Civil and Environmental Engineering, Disaster Prevention Research Center, Kongju National University, 275 Budaedong, Seobukgu, Cheonan 331-717, Korea 2Highway Research Division, Infrastructure Research Department, Korea Institute of Construction Technology, Koyang 411-712, Korea |
Corresponding Author:
Lee-Hyung Kim ,Tel: +82-41-521-9312, Fax: +82-41-568-0287, Email: leehyung@kongju.ac.kr |
Received: October 1, 2010; Accepted: November 22, 2010. |
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ABSTRACT |
This study attempted to develop and suggest a more appropriate method for the determination of event mean concentration (EMC)
and pollutant removal efficiency of a stormwater best management practice (BMP) considering rainfall. The stormwater runoff and
hydrologic data gathered from 22 storm events during a 28-month monitoring period on a swirl and filtration type of BMP were used to
evaluate the developed methods. Based on the findings, the modified EMC method resulted in lower (average) values than the overall
EMC, although the differences were not significant (P>0.05). By comparison, the developed ‘Rainfall Occurrence Ratio’ (ROR) method
was most significantly correlated (r=0.967 to 988, P<0.009) with the other existing removal efficiency determination methods such as
the ‘Efficiency Ratio’ (ER), ‘Summation of Loads’ (SOL) and ‘Regression of Loads’ (ROL) methods. In addition, the ROR method gave the
highest efficiency values, with no significant differences with any of the pollutant parameters, unlike the other three methods. These
results were obtained because the ROR method integrated both pollutant loading and rainfall, which are not considered by the other
three methods. Therefore, this study proved the suitability of the modified EMC and ROR methods for application in other BMP monitoring
studies. |
Keywords:
Best management practice | Event mean concentration | Efficiency | Filtration | Rainfall occurrence ratio method | Stormwater |
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