Bingo! I was not aware the 5th Ave. dam was used for cooling in the past. Most of my knowledge about the removal was talking to some people who worked on the pr

Bingo! I was not aware the 5th Ave. dam was used for cooling in the past. Most of my knowledge about the removal was talking to some people who worked on the project, and they mentioned water erosion (incision). I guess I added 2+2 and got 5.