Oct 31, 2021 3:15 pm
This brick pit was partially buried under the front lawn. It does not appear on any sewer/stormwater drawings.
The pit dimensions are roughly 1m x 0.6m x 1m deep. The two t-shaped pipes are hollow at both ends. One goes uphill towards the side of the house, the other goes towards the street-frontage.
I'm guessing it may be an old septic tank, but I'm not too sure. House was built in 1950-1960, in the Warringah Council area.
The nearest stormwater pipe would be 8m+ away, so I'm assuming it has nothing to do with stormwater.
Re: Large Pit in Front Yard - Not sure what this is3
Oct 31, 2021 5:57 pm
i am guessing it is a stormwater retention pit
too small for septic
Thanks for that, I'll try to test that out sometime by hosing water into a down-pipe to see whether it discharges into the pit.
I forgot to mention it is only a 2-bedroom house so any septic tank could be on the smaller side. I've also seen mention that sometimes separate black-water and grey-water septic tanks are used, which could allow a smaller size but I have no idea if separate tanks were used back in the 1950's.
Re: Large Pit in Front Yard - Not sure what this is5
Nov 02, 2021 8:26 pm
I've seen something similar in the past that was an old sediment trap for stormwater. Water flows out of one pipe, fills up the trap with the water/sediment mix with the sediment falling to the bottom and the water only flowing out of the other to the street gutter.
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