I'm learning as I go along so bear with me.
It would be nice to have the water seep out in addition to preventing my original issue with the placement of some sprinkler heads upstream from the anti-syphon valves which causes the leakage at the valve when the water is turned off. Does either of the 2 below options sound plausible?
1. I see now there is an auto drain valve available which is used for weatherizing. Does this valve when placed at the bottom of my sloped pipes basically automatically let water seep out when the water is turned off (without me doing anything)? If yes, can this work in my scenario?
2. Also, is there nothing to prevent the "non-popup" sprinkler heads from letting water out of the pipes when placed at the bottom of a sloped pipe? If so, can this be another "device" I can use at the bottom of my sloped pipes to allow water to seep out after the water has been turned off?
note, at the bottom of my sloped pipes is also an underground drain so excess water there is ok.
Thanks again.