How many of us are aware that subterranean excavations worthy of the Vietcong in the 70’s or Hammas in more recent times have been going on under our feet on a daily basis? Not me! Jacqui Ahmu and Peter Wilson (Watercare)gave a very thorough explanation of what is happening, where, why and how with mind-blowing photos to show the reality of a 1.5 billion dollar project designed to solve most if not all of the water-related problems faced by Auckland in the last couple of years at least – think College Hill collapse which required a $90 million fix. The main channel for waste and storm water will run for 16 2 km under the city from Mangere to Point Erin in Ponsonby with a couple of off-shoots. There are 17 construction sites, 15 complete of near complete access shafts (19 planned), working chambers and pumping stations and a couple of link sewer lines all on the go 15 -110 metres below the ground. Using boring (in the mechanical sense) machines called Hiwi a te Rangi (the largest with a 4.5m diameter), Dominica (23.4m)and Victoria (1m) 1200 m of the tunnels have been drilled so there is still much to do. But it is much more than just an engineering venture – there are a number of social and environmental spin-offs associated with the project as follows: - Widespread consultations with local groups affected by the work – businesses, iwi, schools, sports clubs, Auckland Transport etc to help a community buy-in. - Recycling of water using pumps. - Using the earth and metal excavated to restore a park on Puketutu Island. - Getting school pupils enthused with seedling collections, insect ‘hotels’, painting hoardings, tree planting and naming competitions (for the borers) etc. A mobile information unit connected with 2500 pupils last year - Providing a model for other construction ventures - Finding some 3 million year-old fossils e.g. scallop shells, bones etc – now at Auckland museum. - The provision of a large laundry facility (Te Whare Manaaki) to clean working gear used by people on the various sites – in itself a huge saving of water. Del Johnson both introduced and gave thanks on behalf of the club whose interest was made evident by the number of questions asked at the end of the presentation. |