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I set up my NexDome Obs with 4 x 250mm dia piers ( 3 for tripod and 1 for a future central pier mount ) they are 500mm below ground sitting on a small 100mm footing into clay and 400mm out of the ground 12mm below underside of my deck. Whilst waiting for my NexDome to arrive from Canada ( 8 months ) I sat 80kg of weight ( borrowed from my welding mate ) on the central pier for 3 months to check and sinkage etc... with heavy rain ( 100mm plus ) on 2 occasions over that period
The pier only sank 1mm if anything. So the pier is grossly over spec’d and would support the Sydney harbour bridge as my current total rigs load is around 38kg and any future upgrade will be less than 80kg
I think most of us over spec our pier supports but better to be safe than sorry as it’s a huge job to rectify if a problem occurs down the track
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