RFI - Attachment H - Stormwater Management Plan_Issue C_

StormFilter overview              ®




1.1 Description                                                      1.2.2 Sizing

                                                                     The StormFilter is typically sized to meet design water quality
StormFilter is a passive, flow-through stormwater filtration
                                                                     objectives, which are subject to legislation regulated by local
system consisting of vaults that house rechargeable
                                                                     government authorities and other relevant environmental
cartridges filled with a variety of filter media, and is installed
                                                                     bodies. MUSIC modelling software is used to determine
in-line with storm drains. The StormFilter works by passing
                                                                     pollutant loads from a site, influenced by a number of factors
stormwater through media-filled cartridges, which trap
                                                                     such as site area, imperviousness and land use. Pollutant
particulates and adsorb materials such as dissolved metals
                                                                     load reduction capabilities, based on third party testing,
and hydrocarbons. After being filtered through the media,
                                                                     allows the number of StormFilter cartridges required to
the treated stormwater flows into a collection pipe or
                                                                     achieve the relevant objectives to be established. Cartridges
discharges into an open channel drainage way. StormFilter
                                                                     are designed to treat a peak flow between 0.7 and 1.6 litres/
is offered in three different configurations: cast-in-place,
                                                                     second, depending on the cartridge size used. For example,
precast and linear. The precast and linear models utilise
                                                                     10 standard sized cartridges (460mm) are able to treat 11
pre-manufactured vaults. The cast-in-place units are
                                                                     L/s, as each filter can treat 1.1 L/s.
customised for larger flows and may be either covered or
uncovered underground units.                                         Because of the highly porous nature of the granular filter
                                                                     media, the flow through a newly installed cartridge is restricted
                                                                     to 1 L/s (average 460mm), using a restrictor disc, to ensure
1.2 Operation                                                        adequate pollutant-media contact time.




1.2.1 Purpose

The StormFilter is a passive stormwater filtration system
designed to improve the quality of stormwater runoff from
the urban environment before it enters receiving waterways.

Through independent third party studies, it has been
demonstrated that the StormFilter is highly effective for
treatment of first flush flows, and fast-paced flows, during
the latter part of a storm. In general, StormFilter’s efficiency
is highest when pollutant concentrations are highest.
The primary target pollutants for removal are: sediments
(TSS), soluble metals, soluble phosphorus, nitrates, and
oil and grease.

                                                                      Photo 27 Filter cartridge




18   Stormwater360 Operations and maintenance