I have so many projects on the go at home, it would be completely stupid to start another one, especially one involving huge amounts of manual labour.
But what the heck, may as well.
So when I get home (currently offshore) I'll be starting to dig a 14ft by 3-3ft hole to bury our trampoline
Sort of like this, but with grass that isn't nearly so perfect:
Just need to figure out the best way to make sure the sides done cave in, it doesn't get flooded, the air can circulate while bouncing, and how best to have it level considering our garden slopes.
I think I'm going to use some of the spoil to build up the side that is low, maybe even creating a kind of rise round about two thirds of it. As for the hole, I'm thinking I could line the sides with corrugated sheeting (I'm sure I've seen stuff that comes on a roll with the corrugation running across the roll) and a good covering of gravel on the bottom and banked up the sides. I'm not keen on having the legs of the trampoline buried, so I was going to take the out the tube that extends the leg, and just have the "foot" connected directly to the trampoline rim. I'll then build eight pillars from standard bricks to rest it on. these would also help to prevent and wall collapse.
As for the air, places have recommended three or four 3"-4" flexible pipes spaced evenly to vent the air as you jump. I think I'll do this, but have them all exiting to one side as opposed to having vest in four points in the garden.
Looking forward to this, first big garden landscaping project I've done. It'll be on a tight budget and probably all done my hand.
I just wonder what the chickens will think of a ground level trampoline...