What to plant in an acre worth of swales.

So I live here in Mountain Home Idaho and we’re 10-15 years before they plan on putting irrigation in for the county. In the meantime, I’ve made dams in the swales with hay bales to capture most of the watershed. What trees or shrubs would do well in swales that get 12 inches of rain. I have 6 acres total to work with and looking for ideas.