While it’s ridiculous to claim that avoiding the impacts of climate change is merely an engineering problem, it looks increasingly likely some mega-projects could be essential soon.
Market Urbanism points me to this infrastructure seminar on storm surge barriers for NYC.
The seminar culminated in the presentation of four conceptual designs of the storm surge barriers:
- Michael Abrahams of Parsons Brinckerhoff proposed a flap-type barrier for the upper East River with a series of panels across the river that normally rest on the bottom, but are raised when a surge is expected.
- Larry Murphy of Camp Dresser & McKee showed a barrier across the Arthur Kill with tide gates, parallel navigation locks, and a pedestrian draw bridge.
- Peter Jansen and Piet Dircke of Arcadis presented the design of a barrier across the Narrows, just north of the Verrazano-Narrows Bridge. The barrier would consist of a pair of rolling or sliding sector gates spanning an 870-foot opening in the center, adjoined by 16 lifting gates with a span of 130 feet, and two lifting gates with a span of 165 feet.
- Dennis Padron and Graeme Forsythe of Halcrow introduced another concept. They proposed a New York–New Jersey Outer Harbor Gateway, a barrier extending from Sandy Hook to the Rockaways, a 5-mile long system of causeway and gates. A key consideration of the outer barrier system concept is that it would not be intended to completely prevent surge waters outflanking the flood defenses at the extreme ends of the barrier system, but rather it would deflect surge energy and mitigate water levels in the Upper and Lower Bay to manageable levels.
Preliminary estimates of the costs of the barriers by the designers were $1.5 billion for the upper East River site, $1.1 billion for the Arthur Kill, $6.5 billion for the Narrows barrier, and $5.9 billion for the Gateway barrier system.
It will be interesting to see how these cost estimates compare to damage estimates in the coming weeks.