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It's a fair question. If it's a scorching summer I'll water it. But it's on the shaded, and lower side of the garden, so those beds rarely get truly dry (yellow highlight shows the max sun) after midday).
But basically the main source is via; a gravel drainage channel from the higher side of the garden that will get shed runoff, the gravel trench from the bed to the right and the bed to the left that has a lot of drainage.
I'm assuming having a solid compacted clay bottom to the bed will slow water escaping (the water stood until the next day when briefly tested).
I'm also looking at Sphagnum moss which holds an incredible amount of water. My thought was having that in the centre and weaving through. But still need to understand what it is and if it'll grow.
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don't want to be negative but i'm not really understanding how this will be a bog. where is all the water coming from? i'm envisaging it in the middle of a scorching august...