{
  "run_id": "harvey_sources_20260626T091339Z",
  "generated_at": "2026-06-27T03:53:47.457598+00:00",
  "all_high_water_marks": {
    "feature_count": 1258,
    "county_counts": {
      "Harris County": 230,
      "Brazoria County": 84,
      "Matagorda County": 74,
      "Jefferson County": 58,
      "Fort Bend County": 57,
      "Wharton County": 49,
      "Liberty County": 49,
      "Calcasieu Parish": 44,
      "Calhoun County": 43,
      "Lavaca County": 42,
      "Hardin County": 40,
      "Montgomery County": 37,
      "Jackson County": 35,
      "Chambers County": 35,
      "Fayette County": 33,
      "Colorado County": 33,
      "Jasper County": 33,
      "Orange County": 31,
      "Gonzales County": 29,
      "Galveston County": 25,
      "Victoria County": 24,
      "Aransas County": 19,
      "Waller County": 18,
      "Newton County": 18,
      "Tyler County": 17,
      "Caldwell County": 16,
      "San Jacinto County": 13,
      "Bastrop County": 13,
      "Refugio County": 12,
      "Austin County": 12,
      "Polk County": 10,
      "De Witt County": 8,
      "Beauregard Parish": 7,
      "Nueces County": 5,
      "San Patricio County": 3,
      "Lee County": 1,
      "DeWitt County": 1
    },
    "peak_stage_ft": {
      "min": 1.9,
      "max": 453.77
    },
    "height_above_ground_ft": {
      "min": 0.0,
      "max": 14.25
    }
  },
  "houston_region_high_water_marks": {
    "feature_count": 535,
    "county_counts": {
      "Harris County": 230,
      "Brazoria County": 84,
      "Fort Bend County": 57,
      "Liberty County": 49,
      "Montgomery County": 37,
      "Chambers County": 35,
      "Galveston County": 25,
      "Waller County": 18
    },
    "peak_stage_ft": {
      "min": 1.9,
      "max": 283.89
    },
    "height_above_ground_ft": {
      "min": 0.0,
      "max": 11.85
    }
  },
  "houston_region_stress_grid": {
    "cell_count": 218,
    "method": "Simple lat/lon grid aggregation of USGS Harvey peak high-water marks. This is a visual stress surface, not a hydraulic model."
  },
  "source_caveat": "High-water marks are observed post-event evidence points. They are not continuous flood-depth surfaces and do not by themselves score every parcel or road.",
  "fema_point_context": {
    "feature_count": 535,
    "context_counts": {
      "inside_sfha": 365,
      "mapped_x_or_minimal": 170
    },
    "zone_counts": {
      "AE": 309,
      "X": 170,
      "VE": 30,
      "A": 25,
      "AO": 1
    },
    "outside_or_not_returned_count": 170,
    "outside_or_not_returned_with_2ft_above_ground_count": 54,
    "method": "Each Houston-region USGS Harvey peak high-water mark was queried against the current FEMA NFHL Flood Hazard Zones layer by point intersection.",
    "caveat": "This uses current NFHL point context as a reproducible screen. It is not a reconstruction of every effective pre-Harvey map panel and not a parcel-level determination.",
    "run_id": "harvey_fema_context_20260626T101446Z",
    "generated_at": "2026-06-26T10:14:46.633265+00:00",
    "source_url": "https://hazards.fema.gov/arcgis/rest/services/public/NFHL/MapServer/28/query"
  },
  "surprise_distance": {
    "run_id": "harvey_surprise_distance_20260627T035347Z",
    "generated_at": "2026-06-27T03:53:47.457367+00:00",
    "zone_x_mark_count": 170,
    "material_zone_x_mark_count": 54,
    "material_zone_x_marks_at_least_quarter_mile_count": 9,
    "material_zone_x_marks_at_least_one_mile_count": 4,
    "distance_miles": {
      "min": 0.0,
      "median": 0.032,
      "max": 2.301
    },
    "material_distance_miles": {
      "min": 0.0,
      "median": 0.032,
      "max": 1.469
    },
    "distance_bucket_counts": {
      "under_0_05_mi": 94,
      "0_25_to_1_mi": 29,
      "0_05_to_0_25_mi": 39,
      "1_mi_or_more": 8
    },
    "top_marks": [
      {
        "site_no": "TXGAL20912",
        "county": "Galveston County",
        "waterbody": "cloud bayou",
        "height_above_ground_ft": 2.6,
        "peak_stage_ft": 22.65,
        "fema_zone": "X",
        "fema_zone_subtype": "AREA OF MINIMAL FLOOD HAZARD",
        "distance_to_current_sfha_miles": 1.469,
        "distance_to_current_sfha_feet": 7754,
        "surprise_distance_bucket": "1_mi_or_more",
        "surprise_score": 3.819,
        "coordinates": [
          -95.09964,
          29.35896
        ]
      },
      {
        "site_no": "TXCHA21578",
        "county": "Chambers County",
        "waterbody": "Oyster Bayou",
        "height_above_ground_ft": 2.9,
        "peak_stage_ft": 18.98,
        "fema_zone": "X",
        "fema_zone_subtype": "0.2 PCT ANNUAL CHANCE FLOOD HAZARD",
        "distance_to_current_sfha_miles": 1.278,
        "distance_to_current_sfha_feet": 6746,
        "surprise_distance_bucket": "1_mi_or_more",
        "surprise_score": 3.706,
        "coordinates": [
          -94.531239,
          29.732081
        ]
      },
      {
        "site_no": "TXGAL20911",
        "county": "Galveston County",
        "waterbody": "cloud bayou",
        "height_above_ground_ft": 3.58,
        "peak_stage_ft": 20.6,
        "fema_zone": "X",
        "fema_zone_subtype": "0.2 PCT ANNUAL CHANCE FLOOD HAZARD",
        "distance_to_current_sfha_miles": 1.214,
        "distance_to_current_sfha_feet": 6410,
        "surprise_distance_bucket": "1_mi_or_more",
        "surprise_score": 4.346,
        "coordinates": [
          -95.10469,
          29.33428
        ]
      },
      {
        "site_no": "TXLIB21725",
        "county": "Liberty County",
        "waterbody": "Ditch",
        "height_above_ground_ft": 5.8,
        "peak_stage_ft": 38.48,
        "fema_zone": "X",
        "fema_zone_subtype": "AREA OF MINIMAL FLOOD HAZARD",
        "distance_to_current_sfha_miles": 1.085,
        "distance_to_current_sfha_feet": 5726,
        "surprise_distance_bucket": "1_mi_or_more",
        "surprise_score": 6.293,
        "coordinates": [
          -94.495095,
          29.908816
        ]
      },
      {
        "site_no": "TXHAR22784",
        "county": "Harris County",
        "waterbody": "Buffalo Bayou",
        "height_above_ground_ft": 2.9,
        "peak_stage_ft": 43.52,
        "fema_zone": "X",
        "fema_zone_subtype": "AREA OF MINIMAL FLOOD HAZARD",
        "distance_to_current_sfha_miles": 0.741,
        "distance_to_current_sfha_feet": 3912,
        "surprise_distance_bucket": "0_25_to_1_mi",
        "surprise_score": 2.149,
        "coordinates": [
          -95.27752,
          29.81461
        ]
      },
      {
        "site_no": "TXHAR21558",
        "county": "Harris County",
        "waterbody": "Bear Cr",
        "height_above_ground_ft": 2.18,
        "peak_stage_ft": 108.27,
        "fema_zone": "X",
        "fema_zone_subtype": "AREA OF MINIMAL FLOOD HAZARD",
        "distance_to_current_sfha_miles": 0.357,
        "distance_to_current_sfha_feet": 1886,
        "surprise_distance_bucket": "0_25_to_1_mi",
        "surprise_score": 0.778,
        "coordinates": [
          -95.637,
          29.84466
        ]
      },
      {
        "site_no": "TXHAR21427",
        "county": "Harris County",
        "waterbody": "Cypress Creek",
        "height_above_ground_ft": 2.23,
        "peak_stage_ft": 149.55,
        "fema_zone": "X",
        "fema_zone_subtype": "AREA OF MINIMAL FLOOD HAZARD",
        "distance_to_current_sfha_miles": 0.307,
        "distance_to_current_sfha_feet": 1620,
        "surprise_distance_bucket": "0_25_to_1_mi",
        "surprise_score": 0.685,
        "coordinates": [
          -95.71543,
          29.93966
        ]
      },
      {
        "site_no": "TXHAR22752",
        "county": "Harris County",
        "waterbody": "Cedar Bayou",
        "height_above_ground_ft": 3.08,
        "peak_stage_ft": 33.4,
        "fema_zone": "X",
        "fema_zone_subtype": "0.2 PCT ANNUAL CHANCE FLOOD HAZARD",
        "distance_to_current_sfha_miles": 0.284,
        "distance_to_current_sfha_feet": 1498,
        "surprise_distance_bucket": "0_25_to_1_mi",
        "surprise_score": 0.875,
        "coordinates": [
          -94.99722,
          29.87826
        ]
      },
      {
        "site_no": "TXLIB22073",
        "county": "Liberty County",
        "waterbody": "West Branch Devers Canal",
        "height_above_ground_ft": 3.7,
        "peak_stage_ft": 48.7,
        "fema_zone": "X",
        "fema_zone_subtype": "0.2 PCT ANNUAL CHANCE FLOOD HAZARD",
        "distance_to_current_sfha_miles": 0.28,
        "distance_to_current_sfha_feet": 1480,
        "surprise_distance_bucket": "0_25_to_1_mi",
        "surprise_score": 1.036,
        "coordinates": [
          -94.59624,
          29.966629
        ]
      },
      {
        "site_no": "TXWAL21357",
        "county": "Waller County",
        "waterbody": "Ponds Creek",
        "height_above_ground_ft": 4.0,
        "peak_stage_ft": 283.89,
        "fema_zone": "X",
        "fema_zone_subtype": "AREA OF MINIMAL FLOOD HAZARD",
        "distance_to_current_sfha_miles": 0.226,
        "distance_to_current_sfha_feet": 1193,
        "surprise_distance_bucket": "0_05_to_0_25_mi",
        "surprise_score": 0.904,
        "coordinates": [
          -95.96921,
          30.13311
        ]
      }
    ],
    "method": "Distance from each Zone X/minimal-context Harvey high-water mark to the nearest current FEMA NFHL SFHA polygon in EPSG:3083.",
    "caveat": "Current FEMA NFHL geometry only. This does not reconstruct exact 2017 effective FIRM panels and does not certify parcel risk."
  }
}