The twin dams and settlings Tanks were all part of an extensive underground watering system that kept the tennis court, rose garden and other flowering beds around the verandahs from sure distraction in the hot dry summer climate. The. Water was pumped through an elaborate underground channel system to twin dams via the Moonee Ponds Creek. It was then pumped by a large Alston Windmills up to the holding tank via water pipes on the fence, and from there fed to the underground. Water pipe system to sprinklers and fire hydrants