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The Calculation of NPS Load per Unit Area in Orchard to the Nakdong River Basin

이재운 1 Heongak Kwon 1 이윤정 1 cheon, se-uk 2

1국립환경과학원
2국립환경연구원

Accredited

ABSTRACT

In this study, Calculated the nonpoint sources(NPS) load per unit area about various rainy events in vineyard of Nakdong River basin. NPS monitoring and calculation for NPS load per unit area were estimated from 'Investigation method of precipitation discharge(National Institute of Environmental Research, 2007)'. The evaluation of applicability for NPS load per unit by compared with prior research data and Total Maximum Daily Load(TMDL) data. Five target areas were each 2000㎡, 1800㎡, 1943㎡, 2484㎡, 864㎡ and located in Gyeongsangbukdo Gyeongju, Gyeongsangbukdo Sangju, Gyeongsangnamdo Hapcheon in Korea. Since fruits were the only crop on the target area, the characteristics of stormwater discharge at survey sites could be evaluated independently. A total of 115 rainfall events in the Orchard area during five years(2008-2012) was surveyed, and 38 of them became stormwater discharge. In the Nakdong River watershed, average of event mean concentrations(EMCs) in Orchard area for biochemical oxyzen demand(BOD), Chemical oxyzen demand(COD), total nitrogen(T-N), total phosphorus(T-P) were 2.0㎎/L, 10.1㎎/L, 3.195 ㎎/L, 0.578㎎/L, respectively. NPS load per unit area in Orchard area showed BOD : 2.0㎏/㎢·day, COD : 10.2㎏/㎢·day, T-N : 3.220㎏/㎢·day, T-P : 0.606㎏/㎢·day.

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