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Due to stormwater runoff along Pohang Bay at typhoon Rusa and Maemi in 2002 and 2003, P steel Company requires a counter measure for all future typhoons. P steel Company will have the challenge of both determining the benefits of their existing treatment facility and deciding what additional practices they will need to achieve the goal. In order to reduce the nonpoint source pollution during rainfalls, P steel Company is considering the installation of stormwater pits and the construction of a stormwater treatment plant. This study analyzed the reduction effect of nonpoint source pollution achieved through such measures using the Storm Water Management Model (SWMM). As a result, we found that the installation of stormwater pits (storage capacity 60mm/day) and stormwater treatment plant have reduced the pollution load (SS) by 38 to 87% compared to the existing state, and the concentration of SS in outflow also satisfied 20mg/L or lower.

OPTIMIZING STORM DETENTION AND TREATMENT FACILITY TO CONTROL NONPOINT SOURCE POLLUTION IN STEEL COMPANY