| 摘要 |
The present storm drain filter comprises a tubular housing with a solid vertical surrounding wall and sized for being recessed inside a storm drain. The housing is supported in the drain by a flange around its top edge. A tubular cartridge is detachably attached to a solid annular bottom plate of the housing. The cartridge comprises a solid annular top cover coaxial with a solid annular bottom closure; vertical tubular inner, intermediate, and outer screens concentrically connected between the top cover and bottom closure; and filter media enclosed between the screens. A central overflow opening inside the inner screen is aligned with a hole on the bottom plate of the housing. An annular debris trough is defined between the cartridge and the housing. Debris flowing into the filter is collected in the trough. As the level of debris rises and obstructs the lower part of the outer screen, the unobstructed upper part of the outer screen continues to filter the water. The vertical outer screen is tall enough to provide a large area which will take a long time to obstruct. When the screens or media are completely clogged, water will continue to flow by passing through the central overflow opening. A handle on the cartridge is used to lift or lower the entire filter in the drain. The top cover on the cartridge is removable for changing the media.
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