diff --git a/src/static/dashboard.html b/src/static/dashboard.html
index f9dce15..9f6da51 100644
--- a/src/static/dashboard.html
+++ b/src/static/dashboard.html
@@ -247,7 +247,7 @@
 <script>
 (function () {
     'use strict';
-    const state = { map: null, layers: [], markers: new Map(), hasFit: false, historyChart: null, selectedStation: null, historyRequestId: 0 };
+    const state = { map: null, layers: [], markers: new Map(), hasFit: false, historyChart: null, selectedStation: null, historyRequestId: 0, p1Stages: null, p1Now: null };
     const $ = (id) => document.getElementById(id);
 
     function flowColor(flow) {
@@ -606,27 +606,75 @@
         return '#1e8b60';
     }
 
-    // Official Chiang Mai inundation map (keyed to P.1), georeferenced approximately.
-    // Tune bounds if the river course in the scan drifts from the basemap.
-    const FLOOD_ZONE_IMAGE = '/static/flood-zones-p1.jpg';
-    const FLOOD_ZONE_BOUNDS = [[18.680, 98.925], [18.855, 99.105]];
-    let zoneOverlay = null;
+    // Chiang Mai inundation zones digitized from the official municipal map and
+    // georeferenced to the OSM Ping centerline (~110 m median accuracy).
+    // Colors: susceptibility ramp — zone 1 floods first (deep red), zone 7 last.
+    const ZONE_COLORS = { 1: '#99201c', 2: '#c0392b', 3: '#d35400', 4: '#e67e22', 5: '#f39c12', 6: '#f5c542', 7: '#f9e3a1' };
+    let zoneLayer = null, zoneData = null;
 
-    function toggleFloodZones() {
+    function zoneStage(zone) {
+        return (state.p1Stages || []).find((s) => s.stage === zone) || null;
+    }
+
+    function zoneStyle(feature) {
+        const zone = feature.properties.zone;
+        const level = feature.properties.level;
+        const st = zoneStage(zone);
+        const p = st ? st.p_exceed : 0;
+        const flooded = state.p1Now != null && state.p1Now >= level;
+        return {
+            color: flooded ? '#7a1512' : '#8a5a2b',
+            weight: flooded ? 2.5 : 1,
+            dashArray: flooded ? null : '4 4',
+            fillColor: ZONE_COLORS[zone] || '#f9e3a1',
+            fillOpacity: flooded ? .55 : .16 + .38 * Math.min(1, p),
+        };
+    }
+
+    function zonePopupHtml(feature) {
+        const zone = feature.properties.zone;
+        const level = Number(feature.properties.level);
+        const st = zoneStage(zone);
+        const flooded = state.p1Now != null && state.p1Now >= level;
+        return `<div class="popup"><div class="popup-code">Flood zone ${zone}</div>
+            <h3>Floods when P.1 ≥ ${level.toFixed(2)} m</h3>
+            <div class="popup-grid">
+                <div class="popup-metric"><span>P.1 now</span><strong>${state.p1Now == null ? '—' : state.p1Now.toFixed(2) + ' m'}</strong></div>
+                <div class="popup-metric"><span>Chance within 24 h</span><strong>${st ? Math.round(st.p_exceed * 100) + '%' : '—'}</strong></div>
+            </div>
+            ${flooded ? '<div class="popup-time" style="color:#8d2f22;font-weight:800">River is at or above this zone’s level now</div>' : ''}</div>`;
+    }
+
+    async function toggleFloodZones() {
         if (!state.map) return;
         const button = $('zones-toggle');
-        if (zoneOverlay) {
-            state.map.removeLayer(zoneOverlay);
-            zoneOverlay = null;
+        if (zoneLayer) {
+            state.map.removeLayer(zoneLayer);
+            zoneLayer = null;
             if (button) button.textContent = 'Show flood zones on map';
-        } else {
-            zoneOverlay = L.imageOverlay(FLOOD_ZONE_IMAGE, FLOOD_ZONE_BOUNDS, { opacity: .62, interactive: false }).addTo(state.map);
-            state.map.flyToBounds(FLOOD_ZONE_BOUNDS, { maxZoom: 13, duration: .8 });
+            return;
+        }
+        try {
+            if (!zoneData) {
+                const response = await fetch('/static/flood-zones-p1.geojson');
+                if (!response.ok) throw new Error(`HTTP ${response.status}`);
+                zoneData = await response.json();
+            }
+            zoneLayer = L.geoJSON(zoneData, { style: zoneStyle })
+                .bindPopup((layer) => zonePopupHtml(layer.feature))
+                .addTo(state.map);
+            state.map.flyToBounds(zoneLayer.getBounds(), { maxZoom: 13, duration: .8 });
             if (button) button.textContent = 'Hide flood zones';
             document.getElementById('station-map').scrollIntoView({ behavior: 'smooth', block: 'nearest' });
+        } catch (error) {
+            if (button) button.textContent = 'Flood zones unavailable';
         }
     }
 
+    function restyleFloodZones() {
+        if (zoneLayer) zoneLayer.setStyle(zoneStyle);
+    }
+
     function stageColor(p) {
         if (p >= .5) return '#cc4b37';
         if (p >= .2) return '#d99018';
@@ -639,6 +687,9 @@
         const p1rows = rows.filter((r) => r.station_code === 'P.1' && Array.isArray(r.stages));
         if (!p1rows.length) { card.style.display = 'none'; return; }
         const row = p1rows.reduce((best, r) => r.horizon_hours > best.horizon_hours ? r : best);
+        state.p1Stages = row.stages;
+        state.p1Now = row.current_level == null ? null : Number(row.current_level);
+        restyleFloodZones();
         $('p1-peak').textContent = `Now ${Number(row.current_level).toFixed(2)} m · predicted peak next ${row.horizon_hours} h: ${Number(row.predicted_max_level).toFixed(2)} m`;
         const strip = $('p1-stages');
         strip.replaceChildren();
diff --git a/src/static/flood-zones-p1.geojson b/src/static/flood-zones-p1.geojson
new file mode 100644
index 0000000..cf8d3ae
--- /dev/null
+++ b/src/static/flood-zones-p1.geojson
@@ -0,0 +1 @@
+{"type": "FeatureCollection", "source": "Digitized from the Chiang Mai municipal inundation map (flood extents of 2548/2554/2565 BE), georeferenced by least-squares fit to the OSM Ping centerline (~150-200 m accuracy)", "features": [{"type": "Feature", "properties": {"zone": 1, "level": 3.7}, "geometry": {"type": "Polygon", "coordinates": [[[98.98929538642234, 18.75826047362413], [98.98929290303863, 18.758974837838622], [98.99206971032511, 18.760760826878315], [98.99265438969589, 18.76192168533337], [98.99559020346827, 18.764154156536165], [98.99898426558495, 18.767993960305482], [98.99962277491225, 18.769065524743407], [98.99957778253433, 18.771744389541297], [99.0001649452888, 18.772190883781857], [99.00116010577094, 18.768172612752842], [99.00073443288606, 18.767458236460893], [99.00145051005072, 18.766743892375494], [99.00170585548737, 18.76513657993807], [99.00132269159673, 18.76245770306272], [98.99995430075874, 18.76093964035842], [98.99973898093262, 18.76129681642694], 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