I am leary of putting the work into swales in our climate these days, since the energy it takes vs the amount of good they do might not be worth it. If we had summer rain, absolutely! I think planting on contour and keyline maybe a better use of energy, as are dams. Storing water in the soil is key, with piles of bio-mass under your trees being number 1. Huglekulture, especially wood buried under grade and on contour, for perenial crops is a wise move. If you have materials available of course.
Mimicking what already exists in this climate for food crops is obviously the way to go. Apples, berries of all varieties, nut trees. We really have massive diversity in the PNW. I love the idea of restoring the natural cycles and living from the land. Salmon, deer, bottom fish, elk, shellfish, bear, berries, nuts.... Oh man how well we could eat!