We have push up greens on typical Chicago area soil (read clay based) which were built for the most part around 1921. While there has been regrassing over time, we are experiencing some drainage issues. We would prefer avoiding a complete rebuild for a variety of reasons and have undertaken an aggressive drill and fill regimen to introduce more sand into the soil profile. In the interim, we are considering some of the newer techniques. We are relatively familiar with the XGD system. Recently we were introduced to PC Drainage. If anyone has familiarity with these or similar techniques I would appreciate your input. I am aware of prior threads about XGD and have observed several courses where that system is in place. Thanks in advance.