Bower, Topsoil is about 600 to 800 mm deep, with about 700 to 900 mm over clay, which was roughly 1500 mm below ground surface if I remember correctly from when we had the soil tests done for building the house. What you see in the photos is soil that I have either imported from outside or relocated from elsewhere on the block to try and generate a bit of drainage. Our block is roughly 150m wide, with less than half a meter of fall across it. Native topsoil is a silt which does not drain very well due to a water table which is basically at ground level at this time of year, so I am often walking on soil that is like walking on a large sponge, squirting out water every step I take.
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