I have to say that as escrow has not closed I am exiled to San Diego, 1000 miles away, until January. I am going on my notes about the property taken at my inspection in October, trying to form a plan that will have to pass scrutiny after I can make more detailed observations. The highest monthly winter rainfall averages are 6.8 and 7.4 inches for the months of Jan- Feb and it cycles to less than an inch in Jul-Aug.
The hillside in question is a clearing about 150 feet up from a seasonal creek, with plenty of forested land on all sides with Douglas fir of 40-50 feet tall. The top of this hill is off the property and at least 3-4 times that high.
I have not observed the property in all seasons yet, though I have rainfall records and other data logged about 3 miles away. There was 1.65 inches of rain on the heaviest rain day last year. Strong winds and deluge style rain doesn't seem to be the norm here. The surrounding well-treed areas seem to shelter the area from strong winds. The local airport has wind speeds that average about 10 mph, rarely as high as 20mph and generally the wind is uphill, from the South. That's without the sheltering from the trees.
I want to understand your concern with fruit trees on berms, and wind. Please spell it out for me. Here are some other details that might help.
I plan to plant only enough trees of the same type for fertilization, and they would be adjacent to their pollinator companions, though widely spaced, with non-fruit trees distributed throughout. The emphasis being to grow as many different fruits as possible. Beekeeping is part of the plan, as are plants to attract wild pollinators.