On the 17th hole, we've been dealing with this perennial wet area. Rather than adding additional drain pipe, we excavated the area to a 10" depth. We will re-install our drain pipe and then cap the area with 10" of sand. this will ensure good water movement and drainage. In our climate, it is amazing the lengths we go to repair poor drainage. We do things in the mountains that most golf courses wouldn't think of!
This is a photo of the sand in the bunker on #1...the new sand we are trying. After 3" of rain on Sunday, I walked through the bunker and still sank down an inch. Our other bunkers are rock hard. This shows how well draining and playable this sand will be.