In this particularly lengthy episode the boys chart the history of Sydney's drinking water from the well-known Tank Stream to the well-known Desal plant, with stop-offs at several obscure systems along the way. Jed's enthusiasm for the minutae of water volumes is only surpassed by Alistair's pure joy at finally learning where the water he's been swilling for most of his life has travelled from.

To get the most out of this episode you'll want to arm yourself with a map of Sydney's drinking water catchments. We recommend this one from Sydney water: https://www.waternsw.com.au/__data/assets/pdf_file/0004/55975/Fact-sheet-and-map-Sydney-drinking-water-catchments.pdf or this slightly altered version from the Welcome Reef Dam astroturfing campaign: https://welcomereef.com/sydney-water-catchments/

Sources for this episode include:

- wikipedia

- Sydney History youtube channel

- UNSW ARTS3242 Course playlist on youtube

- Sydney's Water Sewerage and Drainage System by Donald Hector. Originally published in the Journal and Proceedings of the Royal Society of NSW, Vol. 144, p. 3-25, 2011