sallyg said:No answer, but starting the discussion--
i'm not sure how much to worry about draining when you're above concrete and above surroundings level.
The compost is a huge help, no matter what. The organic part really helps any soil structure. That's a LOT of compost.
The sticks are good, not because they will help drainage, but because they will gradually rot -see 'hugelkultur'
which doesn't seem to worry at all about your native soil.
sand -clay problems I think mainly concerns those who have a lot of clay and think they can fix the garden bed with some sand-failing to realize that the amount they plan to add is way too small in proportion, and to take into account that they are still growing on level with the surrounding clay.
RpR said:You are on concrete, unless you have hole so it can drain onto the cement that water is going nowhere.
The fabric you have in there will make sure it goes nowhere.
If you get heavy rain it will water log regardless of the soil type.
With that set-up soil type means nothing; the wate will go as far as the concrete and stop.
The finer the soil, the quicker it will hit the concrete but so what?
Are those two by twelve or two by sixteen?
Unless you fill them to the brim you will only have eight to ten inches of soil and the bottom will always be water logged unless you have put drains in and then you will have wet concrete.
If you want root crops you will need two by twenty side boards minimum and then it will still water log if the water does run out.
A women on one of these type sites put shiny cardboard under her raised bed; it acted like concrete.
Only she was fortunate the water drained out rather than saturating and killing things but at the same time, she was constantly watering because the water ran out.
My sig. other put plants in wood barrels over two feet deep.
Her plants were dying because the water did not run out.
I drilled hole as low as possible and the water ran out; the water stank like a wet slough.
RpR said:If you have good drainage you will get away with it but what root crops are you thinking of or have grown before.
Compost sinks, often a LOT.
Lee-Roy has the best idea.