I am installing an automatic irrigation system for my backyard, and am trying to figure out the problem caused by a raised planter in the back. Anti-siphon valves require being a foot higher than the highest sprinkler head, so I thought I'd look into in-line valves. However, they require a back flow prevention device which, according to Toro's website, says that it must be intsalled a foot or so higher than the highest sprinkler head. I'd rather not have all that hardware 4 or 5 feet above my patio. What is the recomended way to automatically water a raised planter?
Thanks, Mike