The present invention embodies a drainage device that is used for controlling the flow of rainwater during the first flush of rainfall. The drainage device includes a basin configured to receive rainwater or other liquids from an adjacent driving surface roadway through a drain (e.g., a grate). The interior of the basin encloses a plurality of pollution collection members (e.g., lattices) configured to trap pollutants in the rainwater for extraction from the rainwater. The pollution collection members are angled so as to increase the surface area that is exposed to rainwater entering and received within the drainage device (also referred to herein as the “outside surface” of the pollution collection members). The pollution collection members are configured to trap pollutants. The outside surfaces of the pollution collection members may be covered in a fabric that increases efficiency in filtering pollutants from the rainwater.