RFI - Attachment 3 - Stormwater Management Plan

                                             1.1 How And Why The Ecosol™
                                             Litter Basket Works
                                             The Ecosol™ Litter Basket captures
                                             pollutants at drainage entry points and
                                             consists of a capture basket and an
                                             overflow by-pass flap(s). The basket is
                                             fitted below the invert of the gutter and
                                             inside the drainage inlet pit and
                                             importantly does not obstruct flow in
                                             the outlet pipe. Solid pollutants enter
                                             the Ecosol™ Litter Basket with the
                                             stormwater from roadside or other
                                             run-off areas, such as car parks. The
                                             incoming flow and the pollutants
                                             aquaplane across the flap(s) into the
                                             capture basket. The filtered stormwater
                                             then passes into the drainage network
                                             without any head/hydraulic loss through
                                             the unit.




As the basket approaches 90% full, the
by-pass flap(s) begins to open in
response to the incoming flow. Once
the basket is 100% full the pressure of
the incoming flow forces open the by-
pass flap(s), allowing the excess flow, to
enter the drainage system through the
by-pass openings. This effectively
eliminates the likelihood of flooding, a
common fault with other at-source
systems. Even when in by-pass, the
captured pollutants are not remobilised
and are retained in the capture basket.




            URBAN            ®

        ASSET SOLUTIONS
               Page 3