The Middle Harbour (or the Spit) Syphon

Today we have an historic site related to everyone’s favourite topic.. SEWERAGE!

This is one of the access houses of the Middle Harbour Syphon located at Clontarf Reserve in Clontarf (near the Spit Bridge).

At 358 meters long this inverted syphon (or pressure tunnel) allows sewerage to pass under Middle Harbour between Parriwi Point and Clontarf. It basically helps to keep our waste moving while allowing for marine traffic to pass over the top.

The syphon was built between between 1922 and 1925 and is a well-known landmark due to its Egyptian influenced architecture. There are two parallel 1.8 diameter concrete pipes that sit on the harbour bed at a maximum depth of 22m.

Over the years the dual pipe system was mostly used on rotation, however in recent years both pipes have been in constant use do to the larger volume of sewerage passing through.

The fact that the syphon has been continuously used since construction is a testament to the solid engineering of the syphon when it was built.

Note: I try to be as accurate as possible but make no guarantees. Use this information at your own risk!

Source:
http://www.environment.nsw.gov.au/heritageapp/ViewHeritageItemDetails.aspx?id=5053866
Middle Harbour Syphon Clontarf

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