I'm dealing with a drainage problem and would appreciate some feedback. In a new residential landscape we installed in the fall of 2011 a drainage problem had reared its ugly head. The main yard is a raised area that is retained by a pored concrete wall, faced in cultured stone. The areas where the new turf meets the bedding has started collecting water and there is a 4-6 ft. wide area of the turf, all along the bedding lines, that collects water like crazy. Unlike all the rest of the turf we installed in the other areas of the yard that are looking nice and green and lush, this area just won't drain properly. At one point, we even witnessed upward bubbling from the turf in few spots where there is standing water and in two other spots there was air trapped under the turf causing an actual air bubbles! I've only seen air bubbles under turf one other time in my 20 year stint in landscaping and that was in a commercial area where there was known methane coming from a re-developed landfill site. However, when I cut the bubbled turf with a sod knife, there was no smell of methane and there have been no air pockets develop since, and that was two months ago. We're going to be tackling this drainage problem in 10 days when the property owner is back from holidays. I think we're going to go in and dig a drainage trench right through the middle of the waterlogged area, do a drain system with perforated pipe, fabric, gravel, etc. and "daylight" the drain through a low point in the poured concrete wall. Top the drain/waterlogged area with a 60-70% sand mix and re-turf the area. Also, I'm going to spend the extra couple of hours it's going to take and remove the plants from the bordering bedding areas and give the beds a good tilling and here's why... In going through some video footage that was taken when i was off-site and the soil was being installed, I noticed that one of the guys was using the bed line as his repeated line of delivering buckets of soil to the planting beds. He was using a Bobcat MT-52 track machine and even though the beds are 16" deep with nice composted topsoil, I've noticed some of the more sensitive plants struggling. When I tried to put a shovel in the flower beds where he was running the machine, I struggled to dig a 1 gallon size shrub hole. I'm sure the compacted soil bordering the turf hasn't helped the drainage of the turf, either. I've checked back on some pics I took of the finished subgrade and all my drainage patterns look good. I can upload a couple of pics if that would help. Anyway, that's my plight for the week. Any thoughts?