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Characterization of Stormwater Runoff according to Sewer System in Paldang Watershed

하수도 시스템 유무에 따른 강우유출특성 분석 - 팔당호 유역을 대상으로

Kang, Dong-Han;Sajjad, Raja Umer;Kim, Keuktae;Lee, Chang-Hee
강동한;사자드 라자 우말;김극태;이창희

  • Received : 2015.11.03
  • Accepted : 2016.01.20
  • Published : 2016.03.31

Abstract

The characterization of stormwater runoff from mix land-use catchments with an inadequate sewer network is a challenge. This study focused on characterizing stormwater runoff from the Paldang watershed area based on land-use type and sewer system coverage. A total of 76 sites were monitored during wet weather from seven different counties within Paldang watershed. Public sewer system (PSS) was installed at 48 sites, while 28 sites had no or individual sewer system (ISS) coverage. The results indicated that the sites included in the ISS group with higher forest and paddy land-use percentage exhibit higher values of average event mean concentrations (EMCs) and first flush intensity for suspended solids (SS), total nitrogen (TN), and total phosphorous (TP). In addition, upgrading runoff interception system can capture 59 % of the TP load in the first 43% of runoff within these sites. Similarly, rainfall depth and storm duration showed a positive correlation (R > 0.6) with nutrient loads within ISS group sites, as compared to PSS group. Therefore, these sites are likely to contribute higher TP and TN loads during heavier storm events and should be selected as priority management areas to combat the problem of eutrophication in Paldang reservoir.

Keywords

Eutrophication;Land-use;Sewer system;Stormwater runoff

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Acknowledgement

Grant : 유역 내 비점오염원 조사/평가기술 선진화

Supported by : 명지대학교 산학협력단