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Analysing the effect of impervious cover management techniques on the reduction of runoff and pollutant loads

Hyungseok Park 1 최환규 2 Chung, Se-woong ORD ID 1

1충북대학교
2국립환경과학원

Accredited

ABSTRACT

Impervious covers(IC) are artificial structures, such as driveways, sidewalks, building’sroofs, and parking lots, through which water cannot infiltrate into the soil. IC is an environmentalconcern because the pavement materials seal the soil surface, decreasing rainwater infiltration andnatural groundwater recharge, and consequently disturb the hydrological cycle in a watershed. Increase of IC in a watershed can cause more frequent flooding, higher flood peaks, groundwaterdrawdown, dry river, and decline of water quality and ecosystem health. There has been anincreased public interest in the institutional adoption of LID(Low Impact Development) andGI(Green Infrastructure) techniques to address the adverse impact of IC. The ohjectives of this studywere to construct the modeling site for a samll urban watershed with the Storm Water ManagementModel(SWMM), and to evaluate the effect of various LID techniques on the control of rainfall runoffprocesses and non-point pollutant load. The model was calibrated and validated using the fielddata collected during two flood events on July 17 and August 11, 2009, respectively, and applied toa complex area, where is consist of apartments, school, roads, park, etc. The LID techniques appliedto the impervious area were decentralized rainwater management measures such as pervious coverand green roof. The results showed that the increase of perviousness land cover through LIDapplications decreases the runoff volume and pollutants loading during flood events. In particular,applications of pervious pavement for parking lots and sidewalk, green roof, and their combinationsreduced the total volume of runoff by 15~61 % and non-point pollutant loads by TSS 22~72 %, BOD23~71 %, COD 22~71 %, TN 15~79 %, TP 9~64 % in the study site.

Citation status

* References for papers published after 2023 are currently being built.