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문정수 ( Jung Soo Mun ),유형근 ( Hyoung Keun Yoo ),김형수 ( Hyung Soo Kim ) 빗물학회 2007 빗물 Vol.1 No.1
A rainwater tank has the function of a settling tank as well as a rainwater storage tank. In this study, particle behavior and removal during sedimentation in a rainwater storage tank were investigated, and several considerations about the design of a rainwater storage tank were suggested. The main tank, which consists of two rooms of 125 m3, was operated in sequence under a fixed water level without inflow and outflow after runoff ceased. The removal rate increased regularly according to the retention time for stored rainwater of the initial turbidity of around two NTU (Nephelometric Turbidity Unit). However, the removal rate increased rapidly during the early retention period and then more slowly for stored rainwater of the initial turbidity of 6~11 NTU. Particle numbers and the peak of PSD (Particle Size Distribution) in stored rainwater decreased according to the elapsed retention time.