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Trees impacted by Salt water ponding and salt water flooding
Percentage of tree leaf canopy that leafed out0
25 %
50 %
75 %
100 %
Potential Water Ponding Sites (Saline Sinks)(based on topographic sinks in flood zone)
Open salt water in 1766 (since landfilled)
14 Foot Flood Surge Line (approximate)
Gowanus / Red_HookFlood ImpactsPost Sandy FloodTree Leaf OutPercentages
25 June 2013 [email protected]
Field Notes: Mainly London Planes (Platanus acerifolia) and Dawn Redwoods (Metasequoia glystroboides) were impacted by salt water intrusion to their root areas.
277 Trees were mapped as impacted
Recommendations:Do nothing: Let trees go through full annual leaf out cycle to see which ones survive before replacing anything.
As capital restorationas permit, eliminate salt ponding locations to allow for better draining of flood salt waters. DEP currently has Green Infrastructuredraining reconstruction project on Columbia Street between Sigourney and Bay whichshould be informed of Sandy's lessons before replanting. There is also proposal for a new park and regrading of Gowanus Bay Terminal as part of EPA Gowanus Superfund Cleanup that should integrate Halleck Street and Columbia salt water draining issues.
Most impacted areas are Red Hook Houses at Dwight and King Street and Red Hook Park.
These were built on the old Seabrings Tidal Mill ponds, so settlement and ponding of salt water in these locations was variable on tree health
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