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---
marp: true
theme: riprap
paginate: true
size: 16:9
title: Riprap. Citation-grounded flood-exposure briefings for any place in New York City.
description: ASCE NY State Convention, Albany, May 13, 2026
---

<!-- _class: lead -->
<!-- _paginate: false -->

<img class="lead-mark" src="logo.svg" alt="Riprap dam mark" />

<div class="eyebrow" style="padding-top: 132px;">
  ASCE NY State Convention &nbsp;&middot;&nbsp; Albany, NY &nbsp;&middot;&nbsp; May 13, 2026
</div>

# Riprap

## Citation-grounded flood-exposure briefings for any place in New York City.

<div class="meta" style="grid-template-columns: auto 1px auto; margin-top: 28px;">
  <div>
    <div class="meta-label">Speaker</div>
    <div class="meta-value">Adam Munawar Rahman &middot; IBM &middot; MS CE, NYU</div>
  </div>
  <div class="meta-divider"></div>
  <div>
    <div class="meta-label">Invited by</div>
    <div class="meta-value">Andrew Hicks</div>
  </div>
</div>

---

<div class="eyebrow">00 &middot; Learning objectives</div>

# What you will take away.

<p style="font-size: 18px; color: var(--ink-3); margin-bottom: 16px; max-width: none;">After this session, you will be able to:</p>

<ol style="margin-top: 0;">
  <li>Describe a <strong>citation-grounded architecture</strong> for synthesizing multi-source flood evidence into auditable, site-specific narratives.</li>
  <li>Identify where this approach is <strong>appropriate</strong> (screening, grant evidence, capital planning) and where it is <strong>not</strong> (hydraulic modeling, stamped deliverables).</li>
  <li>Evaluate the <strong>guarantees and limitations</strong> of LLM-based evidence synthesis in civil engineering practice.</li>
  <li>Apply the Five-Stone architecture to <strong>riverine, ice-jam, and dam-failure flooding</strong>.</li>
</ol>


---

<div class="eyebrow">01 &middot; The problem</div>

# When you assess flood exposure, the evidence sits in eight or more places.

<p style="font-size: 20px; color: var(--ink-2); max-width: 72ch; margin-bottom: 14px;">For a capital project, a grant application, a vulnerability assessment, or a property disclosure — the relevant evidence sits across eight or more disconnected primary sources. Synthesizing them into a citable narrative takes hours of GIS work per site.</p>

<div class="box-grid cols-4" style="margin-top: 0; gap: 10px;">

<div class="box tinted">
  <div class="lbl" style="color: #005EA2;">Federal</div>
  <div class="body" style="font-size: 15px;">FEMA NFHL<br>USGS 3DEP LiDAR<br>USGS HWMs (Ida, Sandy)<br>NOAA CO-OPS tide</div>
</div>

<div class="box tinted">
  <div class="lbl" style="color: #1A4480;">State</div>
  <div class="body" style="font-size: 15px;">NPCC4 SLR projections<br>NYS Mesonet<br>NWS METAR / watches<br>NY EJNYC FVI</div>
</div>

<div class="box tinted">
  <div class="lbl" style="color: #0E7490;">City</div>
  <div class="body" style="font-size: 15px;">NYC DEP stormwater scenarios<br>NYC 311 flood complaints<br>FloodNet sensor network<br>NYC DOB filings</div>
</div>

<div class="box dark">
  <div class="lbl">The gap</div>
  <div class="body" style="font-size: 15px;">No common schema. Different vintages. Different spatial resolutions. Different epistemic tiers.<br><br><strong>Each site synthesized by hand.</strong></div>
</div>

</div>

<p style="margin-top: 12px; font-size: 20px;">When a number meets resistance, <strong>the only defense is the audit trail.</strong></p>

---

<div class="eyebrow">02 &middot; Solution</div>

# A flood-exposure briefing for any place in New York City.

<div style="border: 2px solid #94A3B8; border-radius: 2px; overflow: hidden; height: 450px;">
  <img src="../../assets/screenshots/hero.png" style="width: 100%; height: 100%; object-fit: cover; object-position: top;" />
</div>

---

<div class="eyebrow">03 &middot; Architecture</div>

# Five Stones. Each with one job.

<p style="margin: 4px 0 10px; font-size: 17px; color: var(--ink-3); font-family: var(--font-mono);">query &rarr; <strong style="color: var(--ink);">Planner</strong> (Granite 4.1 3B, intent classification) &rarr; Stone roster &rarr; <strong style="color: var(--ink);">Capstone</strong> (Granite 4.1 8B + Mellea) &rarr; briefing</p>

<div style="display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 0;">

  <div style="background: var(--paper-deep); border: 1px solid var(--rule-soft); border-top: 3px solid #475569; padding: 12px 14px; display: flex; flex-direction: column; gap: 4px;">
    <div style="display: flex; justify-content: space-between; align-items: baseline;">
      <span style="font-family: var(--font-mono); font-size: 9px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: #475569;">Cornerstone · USGS 3DEP</span>
      <span style="font-family: var(--font-mono); font-size: 9px; color: var(--ink-3);">2020</span>
    </div>
    <div style="font-size: 13px; font-weight: 600; color: var(--ink); line-height: 1.2; margin-bottom: 4px;">Microtopography (HAND / TWI)</div>
    <div style="display: grid; grid-template-columns: auto 1fr; gap: 2px 8px;">
      <span style="font-family: var(--font-mono); font-size: 9px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.08em;">HAND</span><span style="font-family: var(--font-mono); font-size: 13px; font-weight: 700; color: #475569;">0.82 m</span>
      <span style="font-family: var(--font-mono); font-size: 9px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.08em;">TWI</span><span style="font-family: var(--font-mono); font-size: 13px; font-weight: 700; color: #475569;">14.3</span>
      <span style="font-family: var(--font-mono); font-size: 9px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.08em;">Elev.</span><span style="font-family: var(--font-mono); font-size: 13px; font-weight: 700; color: #475569;">2.1 m MSL</span>
      <span style="font-family: var(--font-mono); font-size: 9px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.08em;">Pct. lower</span><span style="font-family: var(--font-mono); font-size: 13px; font-weight: 700; color: #475569;">78%</span>
    </div>
    <div style="margin-top: 8px; padding-top: 6px; border-top: 1px solid var(--rule-soft); font-family: var(--font-mono); font-size: 10px; color: #475569; font-weight: 600;">[topo]</div>
  </div>

  <div style="background: var(--paper-deep); border: 1px solid var(--rule-soft); border-top: 3px solid #1A4480; padding: 12px 14px; display: flex; flex-direction: column; gap: 4px;">
    <div style="display: flex; justify-content: space-between; align-items: baseline;">
      <span style="font-family: var(--font-mono); font-size: 9px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: #1A4480;">Keystone · TerraMind-NYC</span>
      <span style="font-family: var(--font-mono); font-size: 9px; color: var(--ink-3);">2024</span>
    </div>
    <div style="font-size: 13px; font-weight: 600; color: var(--ink); line-height: 1.2; margin-bottom: 4px;">Building footprint coverage</div>
    <div style="margin: 6px 0;">
      <div style="font-family: var(--font-mono); font-size: 30px; font-weight: 700; color: #1A4480; line-height: 1;">48.41<span style="font-size: 16px;">%</span></div>
      <div style="font-family: var(--font-mono); font-size: 10px; color: var(--ink-3); margin-top: 3px;">250 m radius &middot; Buildings LoRA adapter</div>
    </div>
    <div style="margin-top: 8px; padding-top: 6px; border-top: 1px solid var(--rule-soft); font-family: var(--font-mono); font-size: 10px; color: #1A4480; font-weight: 600;">[keystone_bldg]</div>
  </div>

  <div style="background: var(--paper-deep); border: 1px solid var(--rule-soft); border-top: 3px solid #0E7490; padding: 12px 14px; display: flex; flex-direction: column; gap: 4px;">
    <div style="display: flex; justify-content: space-between; align-items: baseline;">
      <span style="font-family: var(--font-mono); font-size: 9px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: #0E7490;">Touchstone · NYC 311</span>
      <span style="font-family: var(--font-mono); font-size: 9px; color: var(--ink-3);">live</span>
    </div>
    <div style="font-size: 13px; font-weight: 600; color: var(--ink); line-height: 1.2; margin-bottom: 4px;">Flood complaints · 200 m buffer</div>
    <div style="margin: 4px 0;">
      <svg viewBox="0 0 220 60" style="width:100%; display:block;">
        <rect x="8" y="52" width="212" height="1" fill="#CBD5E1"/>
        <rect x="12" y="35" width="28" height="17" fill="#0E7490" rx="1"/>
        <rect x="54" y="18" width="28" height="34" fill="#0E7490" rx="1"/>
        <rect x="96" y="10" width="28" height="42" fill="#0E7490" rx="1"/>
        <rect x="138" y="10" width="28" height="42" fill="#0E7490" rx="1"/>
        <rect x="180" y="27" width="28" height="25" fill="#0E7490" rx="1"/>
        <text x="26" y="32" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="8" fill="#0E7490">2</text>
        <text x="68" y="15" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="8" fill="#0E7490">4</text>
        <text x="110" y="7" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="8" fill="#0E7490">5</text>
        <text x="152" y="7" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="8" fill="#0E7490">5</text>
        <text x="194" y="24" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="8" fill="#0E7490">3</text>
        <text x="26" y="59" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="7" fill="#94A3B8">'19</text>
        <text x="68" y="59" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="7" fill="#94A3B8">'20</text>
        <text x="110" y="59" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="7" fill="#94A3B8">'21</text>
        <text x="152" y="59" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="7" fill="#94A3B8">'22</text>
        <text x="194" y="59" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="7" fill="#94A3B8">'23</text>
      </svg>
      <div style="font-family: var(--font-mono); font-size: 10px; color: var(--ink-3);">19 requests &middot; 5-yr lookback</div>
    </div>
    <div style="margin-top: 8px; padding-top: 6px; border-top: 1px solid var(--rule-soft); font-family: var(--font-mono); font-size: 10px; color: #0E7490; font-weight: 600;">[nyc311]</div>
  </div>

  <div style="background: var(--paper-deep); border: 1px solid var(--rule-soft); border-top: 3px solid #92400E; padding: 12px 14px; display: flex; flex-direction: column; gap: 4px;">
    <div style="display: flex; justify-content: space-between; align-items: baseline;">
      <span style="font-family: var(--font-mono); font-size: 9px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: #92400E;">Lodestone · Granite TTM r2</span>
      <span style="font-family: var(--font-mono); font-size: 9px; color: var(--ink-3);">live</span>
    </div>
    <div style="font-size: 13px; font-weight: 600; color: var(--ink); line-height: 1.2; margin-bottom: 4px;">Surge residual nowcast</div>
    <div style="margin: 4px 0;">
      <svg viewBox="0 0 220 60" style="width:100%; display:block;">
        <path d="M10,40 35,30 60,19 85,16 110,21 135,27 160,34 185,40 210,45 L210,52 L10,52 Z" fill="#92400E" opacity="0.12"/>
        <rect x="8" y="52" width="212" height="1" fill="#CBD5E1"/>
        <line x1="60" y1="19" x2="60" y2="52" stroke="#92400E" stroke-width="1" stroke-dasharray="3,2" opacity="0.6"/>
        <polyline points="10,40 35,30 60,19 85,16 110,21 135,27 160,34 185,40 210,45" fill="none" stroke="#92400E" stroke-width="2" stroke-linejoin="round"/>
        <circle cx="60" cy="19" r="3" fill="#92400E"/>
        <text x="65" y="17" font-family="IBM Plex Mono,monospace" font-size="8" fill="#92400E" font-weight="700">0.22 ft</text>
        <text x="10" y="59" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="7" fill="#94A3B8">0h</text>
        <text x="60" y="59" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="7" fill="#92400E">NOW</text>
        <text x="110" y="59" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="7" fill="#94A3B8">4.8h</text>
        <text x="210" y="59" text-anchor="middle" font-family="IBM Plex Mono,monospace" font-size="7" fill="#94A3B8">9.6h</text>
      </svg>
      <div style="font-family: var(--font-mono); font-size: 10px; color: var(--ink-3);">peak surge residual &middot; 9.6 h horizon</div>
    </div>
    <div style="margin-top: 8px; padding-top: 6px; border-top: 1px solid var(--rule-soft); font-family: var(--font-mono); font-size: 10px; color: #92400E; font-weight: 600;">[ttm_surge]</div>
  </div>

</div>

<p style="margin-top: 8px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3);">Real evidence cards rendered by the live system &nbsp;&middot;&nbsp; 442 East Houston Street, Manhattan.</p>

<div class="box" style="border-top: 3px solid #162E51; margin-top: 10px; padding: 10px 18px;">
  <span style="font-family: var(--font-mono); font-size: 10px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: #162E51;">Capstone</span>
  <span style="font-size: 15px; color: var(--ink-2); margin-left: 14px;">Granite 4.1 8B + Mellea rejection sampling &nbsp;&middot;&nbsp; <code>numerics_grounded</code> &middot; <code>no_placeholder_tokens</code> &middot; <code>citations_dense</code> &middot; <code>citations_resolve</code> &nbsp;&middot;&nbsp; reroll until every claim cites its source &nbsp;&rarr;&nbsp; <strong>cited 4-section briefing</strong></span>
</div>

---

<div class="eyebrow">04 &middot; Demo</div>

# Live demo.

<div style="margin: 40px 0 18px; text-align: center;">
  <p style="font-family: var(--font-mono); font-size: 28px; font-weight: 700; color: var(--ink); margin: 0 auto; max-width: 860px; line-height: 1.35;">&ldquo;Hollis, Queens&rdquo;</p>
</div>

<p style="text-align: center; font-style: italic; font-size: 16px; color: var(--ink-3); margin: 0 auto 28px; max-width: 72ch;">A neighborhood-scale briefing. NYC DEP and OEM planners use this shape of query when scoping where the next $30B stormwater priority site should land.</p>

<div class="box-grid cols-3" style="margin-top: 0;">
  <div class="box" style="text-align: center; padding: 14px 18px;">
    <div class="stat-value" style="font-size: 40px;">5.8 s</div>
    <div class="stat-label">end-to-end</div>
  </div>
  <div class="box" style="text-align: center; padding: 14px 18px;">
    <div class="stat-value" style="font-size: 40px;">4 / 4</div>
    <div class="stat-label">grounding checks every run</div>
  </div>
  <div class="box tinted" style="text-align: center; padding: 14px 18px;">
    <div class="stat-value" style="font-size: 40px;">8+</div>
    <div class="stat-label">primary public-record sources</div>
  </div>
</div>

---

<div class="eyebrow">05 &middot; Civic applications</div>

# The civic case for civil engineers.

<div class="box-grid cols-2" style="margin-top: 8px;">

<div class="box">
  <div class="lbl" style="color: #005EA2;">Grant evidence</div>
  <div class="body">HUD CDBG-DR and FEMA BRIC vulnerability assessments. Riprap auto-generates the per-NTA evidence section for each site in a program area. Citable, reproducible, open-source.</div>
</div>

<div class="box">
  <div class="lbl" style="color: #1A4480;">Capital project screening</div>
  <div class="body">NYC DEP Bluebelt expansion, NYCHA resilience hardening, MTA station prioritization, DOE school siting. Site-by-site evidence packages at the screening tier, before the hydraulic modeling budget is spent.</div>
</div>

<div class="box">
  <div class="lbl" style="color: #0E7490;">NY State Infrastructure Report Card</div>
  <div class="body">The 2026 report is in preparation. Riprap is the per-place evidence layer for the flood-exposure chapter of any future NY State infrastructure report &mdash; reproducible at every address.</div>
</div>

<div class="box">
  <div class="lbl" style="color: #92400E;">Property disclosure compliance</div>
  <div class="body">NY&rsquo;s March 2024 Property Condition Disclosure flood-risk amendment requires sellers to disclose flood history. Riprap is the citable narrative behind the disclosure &mdash; every claim sourced.</div>
</div>

</div>

---

<div class="eyebrow">06 &middot; What Riprap is not.</div>

# What Riprap is not.

<p style="font-size: 18px; color: var(--ink-3); margin-bottom: 14px; max-width: none;">The civil engineer carries the stamp. Riprap surfaces the evidence the engineer judges.</p>

<div class="box-grid cols-2" style="margin-top: 0; gap: 12px;">

<div class="box" style="border-top: 3px solid var(--rule-soft);">
  <div class="lbl">Not a hydraulic model</div>
  <div class="body" style="font-size: 17px;">Riprap does not replace HEC-RAS, SWMM, or ICM. It synthesizes evidence from completed modeling work; it does not produce new flow or stage estimates. No substitute for a calibrated hydraulic model.</div>
</div>

<div class="box" style="border-top: 3px solid var(--rule-soft);">
  <div class="lbl">Not a stamped deliverable</div>
  <div class="body" style="font-size: 17px;">The briefing is a starting point for a memo, not the memo itself. Professional judgment, field reconnaissance, and the engineer&rsquo;s stamp are required for any actionable deliverable.</div>
</div>

<div class="box" style="border-top: 3px solid var(--rule-soft);">
  <div class="lbl">Not a substitute for site investigation</div>
  <div class="body" style="font-size: 17px;">Microtopography is from 1 m USGS 3DEP LiDAR, appropriate for screening, not for design. Field reconnaissance, soil borings, and survey are not replaced.</div>
</div>

<div class="box" style="border-top: 3px solid var(--rule-soft);">
  <div class="lbl">Not a risk score</div>
  <div class="body" style="font-size: 17px;">Riprap does not output a 1&ndash;10 or 1&ndash;100 number. Score-based tools (First Street, ClimateCheck, Jupiter) are different products for different audiences. Riprap is the evidence audit trail behind any such judgment.</div>
</div>

</div>

---

<div class="eyebrow">07 &middot; Directions</div>

# Where this goes from here.

<p style="margin-bottom: 14px; font-size: 18px; color: var(--ink-3); font-family: var(--font-mono); letter-spacing: 0.02em;">The architecture is data-choice-specific, not code-specific.</p>

<div class="box-grid cols-2" style="margin-top: 0;">

<div class="box">
  <div class="lbl" style="color: #005EA2;">Upstate NY flooding</div>
  <div class="body">The same five-Stone pattern for riverine, ice-jam, and dam-failure flooding. Different primary sources, same architecture.</div>
</div>

<div class="box">
  <div class="lbl" style="color: #475569;">Historical-event mode</div>
  <div class="body">Re-run the system against snapshot data from any past date. Calibration as a core feature.</div>
</div>

<div class="box">
  <div class="lbl" style="color: #1A4480;">Stones as standalone packages</div>
  <div class="body">Each Stone runs alone. Pull one without the full Riprap stack.</div>
</div>

<div class="box tinted">
  <div class="lbl" style="color: #0E7490;">Cross-domain</div>
  <div class="body">The same pattern for transit, water, energy, and structural-condition reporting. Flood is the first domain.</div>
</div>

</div>

---

<div class="eyebrow">08 &middot; How it was built</div>

# The art of the possible.

<div class="box-grid cols-2" style="margin-top: 8px; gap: 20px;">

<div>
  <p style="font-size: 20px; color: var(--ink-2); max-width: none; margin-bottom: 16px;">Three days of AI-assisted development, on top of months of design thinking. Four foundation models. Three Apache-2.0 NYC fine-tunes trained on AMD MI300X for the AMD &times; lablab.ai Developer Hackathon (May 4&ndash;10, 2026).</p>
  <p style="font-size: 20px; color: var(--ink-2); max-width: none;">Apache-2.0 end-to-end on public-record federal, state, and city data. No commercial APIs contacted at runtime.</p>
  <p style="font-size: 20px; color: var(--ink); max-width: none; margin-top: 12px;"><strong>Built in three days. Designed over months. The tools have shifted what one engineer can ship.</strong></p>
</div>

<div>
  <div class="box tinted" style="margin-bottom: 10px;">
    <div class="lbl">Foundation models</div>
    <div class="body" style="font-size: 15px;">IBM Granite 4.1 8B (synthesizer) &middot; IBM Granite Embedding 278M (RAG) &middot; GLiNER (typed extraction) &middot; vLLM on AMD MI300X</div>
  </div>
  <div class="box tinted" style="margin-bottom: 10px;">
    <div class="lbl">NYC fine-tunes (Apache-2.0, HF Hub)</div>
    <div class="body" style="font-size: 15px;">Prithvi-EO-2.0-NYC-Pluvial (flood detection, IoU 0.598) &middot; TerraMind-NYC-Adapters (LULC + Buildings) &middot; Granite-TTM-r2-Battery-Surge (surge nowcast, RMSE 0.157 m)</div>
  </div>
  <div class="box tinted">
    <div class="lbl">Agentic framework</div>
    <div class="body" style="font-size: 15px;">Burr FSM &middot; Mellea rejection sampling &middot; LiteLLM Router (vLLM / Ollama failover) &middot; FastAPI SSE stream</div>
  </div>
</div>

</div>

---

<div class="eyebrow">09 &middot; Discussion</div>

# What I want from this room.

<div class="box" style="border-left: 3px solid var(--accent); padding: 18px 24px; margin-bottom: 18px; background: var(--paper-deep);">
  <div class="body" style="font-size: 19px; line-height: 1.5; max-width: none;">I am a software engineer, not a civil engineer. The system I just showed you is opinionated about what counts as evidence: citation-grounded, silent when uncertain, public-record only. But I am less sure about where it falls short of how a stamped engineering deliverable would need to behave.</div>
</div>

<p style="font-size: 19px; font-weight: 600; color: var(--ink); margin-bottom: 10px;">Three questions for the room:</p>

<ol>
  <li>Where in your practice would a tool like this be <strong>useful</strong>, and where would it be a <strong>liability</strong>?</li>
  <li>What <strong>evidence sources</strong> are you using that Riprap does not yet know about?</li>
  <li>What would have to be true for a citation-grounded narrative tool to be <strong>trusted as a screening-tier deliverable</strong>?</li>
</ol>

<hr style="margin: 16px 0;" />

<p style="font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin: 0;">Open-source &middot; Apache-2.0 &middot; github.com/msradam/riprap-nyc</p>

---

<!-- _class: cta -->

<img class="cta-mark" src="logo-paper.svg" alt="Riprap dam mark" />

<div class="eyebrow" style="margin-top: 124px; color: var(--accent); border: 0; padding: 0;">Riprap &middot; citation-grounded flood briefings</div>

<h1 style="white-space: nowrap; font-size: 72px;">github.com/msradam/riprap-nyc</h1>

<hr>

<p style="font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase;">
Apache-2.0 &middot; public data only &middot; IBM Granite 4.1 &middot; AMD MI300X &middot; Mellea grounding
</p>

<p style="font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: rgba(244,246,249,0.55); margin-top: 16px;">
ASCE NY State Convention &middot; Albany, NY &middot; May 13, 2026
</p>

<p style="font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.08em; color: rgba(244,246,249,0.4); margin-top: 24px; text-transform: none;">
Dam mark: &ldquo;Dam&rdquo; by Chintuza via the Noun Project, CC-BY 3.0.
</p>

---

<!-- _paginate: false -->

<div class="eyebrow">Appendix A &middot; The receipts</div>

# 5 of 5 NYC addresses. Every claim verified, every run.

<table>
  <thead>
    <tr><th>address</th><th>intent</th><th>wall</th><th>steps</th><th>verified</th></tr>
  </thead>
  <tbody>
    <tr><td>442 E Houston St &middot; LES</td><td>address</td><td>7.6 s</td><td>19</td><td>4/4</td></tr>
    <tr><td>80 Pioneer St &middot; Red Hook</td><td>address</td><td>13.1 s</td><td>19</td><td>4/4</td></tr>
    <tr><td>100 Gold St &middot; Manhattan</td><td>address</td><td>11.2 s</td><td>19</td><td>4/4</td></tr>
    <tr><td>Hollis &middot; Queens</td><td>neighborhood</td><td>5.8 s</td><td>9</td><td>4/4</td></tr>
    <tr><td>Coney Island &middot; Brooklyn</td><td>neighborhood</td><td>9.9 s</td><td>9</td><td>4/4</td></tr>
  </tbody>
</table>

<div class="box-grid cols-3" style="margin-top: 16px;">
  <div class="box">
    <div class="lbl">Wall-clock</div>
    <div class="stat-value">5.8&ndash;13.1<span style="font-size: 22px; color: var(--ink-3); font-weight: 400; letter-spacing: 0;"> s</span></div>
    <div class="stat-label">vLLM on AMD MI300X</div>
  </div>
  <div class="box">
    <div class="lbl">Evidence layers</div>
    <div class="stat-value">5</div>
    <div class="stat-label">Stones per briefing</div>
  </div>
  <div class="box">
    <div class="lbl">Grounding</div>
    <div class="stat-value">4 / 4</div>
    <div class="stat-label">source checks every run</div>
  </div>
</div>

---

<!-- _paginate: false -->

<div class="eyebrow">Appendix B &middot; Primary sources</div>

# Sources. Every claim traces to one of these.

<div class="box-grid cols-3" style="margin-top: 8px; gap: 10px;">

<div class="box tinted">
  <div class="lbl" style="color: #005EA2;">Federal</div>
  <div class="body" style="font-size: 14px; line-height: 1.6;">
    FEMA NFHL (current)<br>
    USGS 3DEP 1 m LiDAR (2020)<br>
    USGS HWMs &mdash; Sandy 2012, Ida 2021<br>
    NOAA CO-OPS tide gauge, Battery (live)<br>
    NWS METAR / flood watches (live)
  </div>
</div>

<div class="box tinted">
  <div class="lbl" style="color: #1A4480;">State / regional</div>
  <div class="body" style="font-size: 14px; line-height: 1.6;">
    NPCC4 SLR projections (2023)<br>
    NY EJNYC Flood Vulnerability Index (2024)<br>
    NYS Mesonet (live)<br>
    NY Property Condition Disclosure (Mar 2024)
  </div>
</div>

<div class="box tinted">
  <div class="lbl" style="color: #0E7490;">City</div>
  <div class="body" style="font-size: 14px; line-height: 1.6;">
    NYC DEP stormwater scenarios (2024)<br>
    NYC 311 flood complaints (live, 5-yr)<br>
    FloodNet sensor network (live)<br>
    NYC DOB filings (live)<br>
    NYC Open Data &mdash; NYCHA, DOE, MTA, hospitals
  </div>
</div>

</div>

<p style="margin-top: 14px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3);">All datasets are public-record. No commercial data APIs. No proprietary hazard scores.</p>