| Title |
The Applicability for Estimating MFFn by SWMM in The Trunk Road |
| Authors |
권헌각 ( Hun Gak Kwon ) ; 이재운 ( Jae Woon Lee ) ; 이윤정 ( Youn Jeong Yi ) ; 윤영삼 ( Young Sam Yoon ) ; 이춘식 ( Chun Sik Lee ) ; 이재관 ( Jae Kwan Lee ) |
| Keywords |
First flush phenomenon; Mass first flush; MFFn; SWMM; Trunk road |
| Abstract |
The first flush phenomenon and the Mass First Flush (MFFn) were analyzed for various rainy events in trunk road. Applicability for estimate MFFn using SWMM was evaluated by comparision with observed MFFn. First flush phenomenon was investigated by normalized cumulated (NCL) curve of every pollutant based on ten times of rainfall events monitoring data from 2008 to 2009. As a result, magnitude of first flush phenomenon varied with the pollutants and rainfall events. First flush phenomenon was detected highly in the trunk road. MFFn was estimated by varying n-value from 10 to 90% on the rainfall events. The n-value increases, MFFn is closed to ``1``. As time passed, the rainfall runoff was getting similar to ratio of pollutants accumulation. The result of a measure of the strength of the linear relationship between observed data and expected data under model was good (R2=0.956). As the final outcome, we have good reliability, estimation and application of MFFn using model seem statistically possible. |