RFI - Noosa River Houses - Amendments

                                                                                                                                                                                   rev     date      issued details
        client sign-off:                          date:                                                                                                                                                                                                                                                                                       Detailed Design


FLOW DEFENCE - Flow Water Barrier - Concealed
and Self Closing


NOTE: This is an extract from www.flowdefence.com.au

Flow Defence concealed and self closing Flood Water Barrier systems avoid conflicts with existing
underground services. The system is a completely self contained unit. The entire flood water barrier can
be installed within the property boundary and does not require additional service pits to operate.
Unlike other systems on the market, debris does not need to be removed after activation in order to lower
the barrier. A unique patented design ensures the barrier does not need to be removed in order to access
the underground chamber.

The concealed and self closing flood water barrier system does not require electricity to operate. It is
fully activated by rising flood water being captured within the interception chamber.

The chamber has removable grates with 25mm spacing’s. This prevents any large debris from entering
the chamber and also allows access into the chamber for routine maintenance.

A submersible pump is located inside the chamber to lower the barrier after a flood event. The barrier
will only raise when more water enters the chamber then can be pumped out.                                                           Flow Defence Flood Water Barrier example

A sump below the barrier can store any particles that sink to the bottom of the chamber. These particles
can be removed with a vacuum truck during standard maintenance or after the barrier has been
activated if necessary.

The sealing mechanism is mounted to the barrier and cannot be tampered with while the barrier is
retracted below ground level.

The seal on the barrier is mounted in such a way that it is always above the water level within the
chamber. This way when it raises into position the seal will not be prevented from compressing by
floating debris.

The barrier has been designed to have additional buoyancy in case a tree branch or other such object
falls over the top of the barrier during a storm before it activates. This additional buoyancy is dependent
on the barrier size but it equates to about 200kg of lifting force.




                                                                                                                                     Proposed driveway / basement ramp entry with barrier down                                                                     Proposed driveway / basement ramp entry with barrier activated




Features

Applications: Domestic, commercial and industrial access points including but not limited to driveways,
basement carpark ramps, doorways, walkways, stairwells, lift shafts and gateway openings.

Installation: Hidden below ground level, the small surface area is independent of the flood water barrier
height. The design is a self contained unit eliminating the need for deep trenching and remote service pits.

Operation (activate): Concealed and self closing, flood water is intercepted by surface grates and
collected in an underground chamber, as the chamber fills with water a buoyant barrier raises to the surface.

Operation (deactivate): The chamber does not free drain to the stormwater network, this is to prevent
surcharging which could raise the flood door earlier than necessary.
                                                                                                                                     stage 01 - flood water fills strip drain                       stage 02 - water fills and bouyant barrier activates           stage 03 - bouyant barrier rises                                 stage 04 - flood water is unable to enter basement
Maintenance: A submersible pump is used to drain water out of the chamber and can be accessed from
ground level without removing the flood water barrier.




                                                                       a: shop 5, 212 david low way, peregian beach, qld 4573
                                                                       p: (07) 5471 3033                                        Noosa River Houses                                                                                                                        Scale

  sparks architects                                                    www.sparksarchitects.com
                                                                                                                                128 Gympie Terrace, Noosaville                                    Michael Cullen                                    202       AH          Proposed Flood Water Barrier                                   DD 4.3
                                                                       sparks architects pty. ltd. abn 89 124 611 721
                                                                       qld architect's registration No. 3974                    project                                                           client                                            job no.   drawn       drawing                                                        dwg no.