Hau, Jon,
The idea of using those
wood piles to create hugelbeds is a great one. The way I am doing it on my sun facing hillside is to first dig an on contour ditch, reserving the soil for filling in between the layers of wood. I put the wood into that ditch, spreading the dirt dug out over each layer of wood until I have it to the height I want, after that is done, I dig the up hill
swale and use the dirt to cover the
hugel wood. after that I get some clovers growing to stabilize the new mound. I am arranging these so they slow the water down
enough to prevent anymore erosion from the hill side. Each swale has a "spillway" that leads to the swale below it, these are staggered so the water has to travel the entire length of each swale before it can move downhill to the next swale (the water zig zags down the hillside). I will be planting orchard trees in the spaces between swales, I have about 6 feet between the back side of the up hill swale mound and the up hill edge of the next down hill swale, this will give the orchard trees enough "virgin" soil to establish a good
root system for anchoring the trees to the hillside. You can plant trees after forming the beds since you aren't planting on the mound but rather in front of it (or between the mounds if that makes more sense). Once you have the trees planted, you can grow other items, squash, melons, taters, corn, etc. on the mounds, taller growing items
should be planted towards the up hill base of the mounds so there is enough stable soil for good anchoring of these plants.
If you follow the practice of mulching the mounds every year, the soil will build up and any settling will be filled in by the new layers of mulch/
compost. The water collected will plume down the hill, each swale adding to the plume, this should keep you from needing to water the orchard trees much of the year.