Riprap is a citation-grounded flood-exposure briefing tool for New York City. Type an address, neighborhood, or proposed development — Riprap returns a written briefing where every numeric claim links to its primary public-record source.

Built for agency analysts, planners, journalists, community boards, and researchers. Not for individual residents making personal property decisions. For residents seeking flood guidance, see FloodHelpNY. For real-time conditions, see FloodNet NYC.

Sample queries

{#each SAMPLE_QUERIES as s, i (i)} {/each}

How Riprap is built

Cornerstone remembers — what NYC's ground remembers.
Keystone tallies — what's exposed.
Touchstone watches — what's happening now.
Lodestone projects — what's coming.
Capstone writes it all down with citations.

All foundation models Apache-2.0; no commercial APIs at runtime.
All data from public-record federal, state, and city sources.
Four epistemic tiers — empirical, modeled, proxy, synthetic prior — visible in the briefing margin and the trace.
Sections without supporting documents are omitted entirely. Silence over confabulation.

Methodology paper →