Callaghan and Toth IWMP Report revised

STORMWATER QUALITY AND TREATMENT


‘Catch-All-Row’ (C-A-R)
The ecoAID® system utilises a stormwater treatment
device called a ‘Catch-All- Row’. The C-A-R retains gross
pollutants, sediment and other contaminants whilst
allowing clean water to enter into adjacent rows before
infiltrating into the surrounding soil or being discharged
downstream. The C-A-R row is connected to the inlet
pit and provides a large volume for sedimentation and
solid deposition (figure 1). This in turn enhances the
capabilities of stormwater treatment and greatly extends
the maintenance return intervals.
The C-A-R acts as a primary and secondary treatment
measure by removing gross pollutants and sediments
including total suspended solids (figure 2). The C-A-R can
also be used in conjunction with traditional treatment
measures as part of a wider external treatment train to      (figure 1)
further improve the stormwater quality entering into
local waterways.



Geotextiles
Stormwater entering into the ecoAID® system is filtered
by a woven geotextile (figure 3) which is laid along
the base of each C-A-R and then ex-filtrates into the
stone bedding. Additional filtration and exfiltration of
stormwater occurs via the chamber slots which are
surrounded with a bidim® non-woven geotextile along
the entire length of the C-A-R (figure 3).

                                                             (figure 2)
Unique features of C-A-R
99 Large filtration area – each chamber has a large
   surface area which permits filtration of stormwater
   through the bottom woven geotextile.
99 Large sediment storage volume – greatly extending
   maintenance return intervals.
99 Serviceable due to unimpeded access for cleaning.


Modelled in MUSIC
The ecoAID® system (i.e. C-A-R) can be modelled in
MUSIC and therefore the redundancy of additional GPTs
in certain conditions can be demonstrated – although in
some circumstances the use of additional filter media or
3rd party devices may be required to meet nutrient load
reduction targets.




                                                             (figure 3)