4.7 ft Sandy storm-surge HWM at address
USGS High-Water Mark database · 2012
A flood exposure briefing
for any place in New York City. Type an address. Get a written briefing where every numeric claim links to its primary public-record source.
Try:
What you'll get back
Briefing excerpt
The lot sits inside the FEMA 1% AE flood zone [c3], with Sandy high-water marks recorded 4.7 ft above grade [c1]. FloodNet FN-BK-018 has logged 14 nuisance floods since 2023 [c2].
[c1] USGS HWM · Sandy 2012 empirical
[c2] FloodNet FN-BK-018 empirical
[c3] FEMA NFHL · 36047C0207 modeled
Evidence cards
14 nuisance-flood events, 2023–2026
FloodNet FN-BK-018 · 2 blocks north
FEMA 1% annual-chance (AE) flood zone
FEMA NFHL · panel 36047C0207
+30 in MSL by 2070 (NPCC4 high)
NPCC4 SLR projection · 2024
Map
empirical modeled proxy
How Riprap reads a place
Each briefing routes through a fixed taxonomy of public-record specialists. Each Stone is a class of evidence. Together they form the briefing, and every claim in the output traces back to the Stone that produced it.
01
Cornerstone
the hazard reader
what NYC's ground remembers
USGS HWMs · FEMA NFHL · DEP stormwater · Prithvi historical
02
Keystone
the asset register
what's exposed
MTA · NYCHA · DOE · DOH · PLUTO
03
Touchstone
the live observer
what's happening now
FloodNet sensors · 311 complaints · NWS · NOAA tide gauges
04
Lodestone
the projector
what's coming
NPCC4 · Granite TTM (zero-shot + NYC fine-tune) · NWS alerts
05
Capstone
the synthesizer
writes it all down
Granite 4.1 composer · Mellea grounding-check · WeasyPrint