Retro fitting swales into orchard

Hi All,

As the title states. Does anyone of good resources, tips/tricks or advice about retro fitting swales to an existing orchard? I’ll leave the details out so the advice can be used by many. Two main things: sloped hill and the fruit trees are scattered around the place.

Obviously marking the contour lines and see which trees are on line with each other and who is not. As a helping guide as to where to place the swales.

But still, one has roots to content with, hopefully not to damage them too much.

Does anyone have experience with this?

Thanks!