Planting near a drain

I have a new garden, 4.5m wide and 10m long, with an adopted drain running the length of it at one side.

I'd like to plant some apple and plum trees on dwarfing rootstock, and some blackberries, blueberries, raspberries and rhubarb, just to get started.

Can anyone give me advice about whether the drain is likely to be a problem? If so what are some safe planting distances?

 

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Generally trees roots spread as far underground as the spread of the branches above.

Saying that though, if they get thirsty they can reach out if they detect a water source, have found pine tree roots completely blocking a clay drain

 

So seems like if I plant the trees on the opposite side from the drain they will be okay. What about the bushes, would their roots be strong enough to damage a drain? I'd like to plant them on the same side of the garden as the drain for some balance.