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Letting the good stuff out without letting the bad stuff in.

The anti-filtration Overflow Relief Cap is designed to preclude extraneous surface water from entering sewer systems and provide property protection from a surcharging sewer via the Overflow Relief Gully (ORG).

Infiltration of stormwater into sewer drains has long been recognised as a problem for sewerage treatment infrastructure. This can have a major impact on estuarine environments if systems fail and untreated sewage is released. It has been estimated as much as 40% of this infiltration is attributed to non-conforming overflow relief gullies.

The Overflow Relief Cap (ORC) is an anti-filtration device, which seals against stormwater infiltrating sewer drains during flood conditions, whilst providing effective vent and overflow relief functions.

Functions of the ORC Device

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Venting

In normal operation, the ORC device acts as a vent to prevent water syphoning out of the trap

Sealing

The ORC device provides a water tight seal against ingress in flood prone areas

Overflow

In the event of a surcharge, the ORC device will eject from the gully riser allowing free relief as per a conventional ORG

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Gallery

Installation

Location

The ORC anti infiltration overflow relief device may only be fitted to the top of an Overflow Relief Gully (ORG) located outside a building and which has a fixture or other approved discharge connected to it to maintain the water seal of the trap. Only ground floor fixtures may be connected to this ORG.

The ORC may be installed with a finished minimum height of 25mm above the surrounding surface area.

New Installation

  1. ORG to be installed in accordance with AS3500.2 (4.6)
  2. Join the ORC sleeve (A) to the top of ORG Riser to finish at a minimum of 25mm above ground level and 150mm below the fixture spill level.
  3. Place the ORC cap (B) into the sleeve.
  4. Protect the ORG Riser with a concrete mound.

Retro Fit Installation (May be any type of approved pipe material)

  1. Remove existing grate from ORG.
  2. Join the ORC sleeve (A) to the top of the ORG Riser using approved jointing material. If the cap is to be installed into old earthenware pipe you may need to cut down the outer sleeve (A) of the ORC device. The sleeve must terminate above the top of the faucet.
  3. he top of the ORG must be a minimum of 25mm above ground level and 150mm below fixture spill level.
  4. Place the ORC (B) into the sleeve.
  5. Protect ORG Riser with concrete mound.

Savings Calculator

No. properties fitted with ORC

90 day average Kl discharge from a residential property
(Urban Melbourne Average 80Kl per 90 days)

Sewer charge / Kl charged by your authority

Assuming 16% Illegal Discharge

Total illegal discharge over 90 days

Total annual discharge

Kl
Kl
Kl

Total treatment cost based on the cost / Kl for illegal discharge

$

Cost per installation

Reduction in treatment costs (per annum)

No. devices to be installed

Total cost to install

No. of Kl not requiring treatment in 12 months

$
$
Kl

Payback Period

Months