| 摘要 |
PURPOSE: A non-point pollution source reduction apparatus is provided to be able to selectively operate filters installed in a filter tub according to the amount of the initial rainwater flowed into the filter tub. CONSTITUTION: A non-point pollution source reduction apparatus comprises a reservoir; and a filter tub equipped with a filter for filtering initial rainwater. The filter comprises a floating body (62) moving up and down in the side of the filter, and a rainwater filtration area determination plate (64). The rainwater filtration area determination plate determines the filtration area of rainwater by moving along the side of the filter from the bottom surface of the filter according to the up down movement of the floating body to expand the filtration area of the filter, or by moving along the bottom surface of the filter from the side of the filter to reduce the filtration area of the filer. The rainwater filtration area determination plate is fixed so as to be able to slide in the transverse guide grooves formed on both sides of the bottom surface of the filter, and the longitudinal guide grooves formed on both sides of the side of the filter. |
