Stormwater filtration apparatus, system and method

Abstract

A stormwater filter cartridge includes a housing having an inlet and a filtered outlet, and a filter medium disposed along a flow path between A drainage space forms at least part of the flow path and is disposed between a downstream side of the filter medium and the filtered water outlet A float tube disposed in the drainage space has an open lower end and open upper end, the float tube movable between a lowered position that inhibits filtered water at the bottom of the drainage space from passing to the filtered water outlet and a raised position that permits free flow of filtered water to the filtered outlet A fluid reservoir in fluid communication with the drainage space and is disposed within the housing and above the filter medium for collecting filtered water as water level in the housing rises while the float tube is in the lowered position.

Description

[0001] cross reference [0002] This application claims the benefit of US Provisional Application Serial No. 61 / 240,808, filed September 9, 2009, the entire contents of which are hereby incorporated by reference in their entirety. technical field [0003] The present application generally relates to a stormwater filtering device, and in particular to a modular stormwater filtering assembly with a backflow function. Background technique [0004] Stormwater is typically stormwater plus some particulate debris and dissolved matter carried by stormwater runoff. In urban areas, rainwater that falls on the roofs of buildings and collects on paved areas like driveways, roads, runways, and sidewalks is often transported through a pipe system separate from the sewage system. [0005] Stormwater is a diffuse or non-point source pollution. Contaminants such as litter, sediment, organic matter, heavy metals and organic toxins can be entrained and transported to the receiving natural w...

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