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