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Physical Risk

Physical Risk Collated Dataset

Seven independent physical risk layers assembled at the parcel level — with a single 0–100 Physical Risk Score synthesizing flood exposure, ground movement, terrain, soil risk, and impervious cover — 237K+ parcels across Caddo, Bossier, and DeSoto.

237K+

Parcels

Parishes

Source Layers

393

Zone X Anomalies

About this product

Physical risk at a parcel is rarely from a single source. Flood exposure depends on elevation and subsidence rate. Foundation risk depends on soil shrink-swell potential and corrosion class. Runoff and drainage depend on terrain slope and impervious cover. This dataset assembles all seven layers into a single parcel-level file — no GIS joins required.

Each layer is independently sourced: FEMA National Flood Hazard Layer (flood zone and BFE), USGS 3DEP 10m DEM (elevation and terrain slope), NLCD 2021 30m rasters (impervious surface and tree canopy), Sentinel-1 InSAR via MintPy (vertical ground movement velocity), USDA SSURGO Web Feature Service (soil drainage class, hydric designation, shrink-swell LEP, and concrete corrosion rating), JRC Global Surface Water v1.4 (40-year observed inundation history, 1984–2021), and NOAA Atlas 14 Volume 9 (24-hour precipitation frequency at four return periods).

JRC Global Surface Water produces the dataset's most actionable finding: 393 parcels in Caddo and Bossier carry a FEMA Zone X designation — technically low-risk — yet show confirmed inundation in the 40-year satellite record. These parcels fall through every model built on regulatory flood zone designation alone. The dataset identifies them at the parcel level.

The Physical Risk Score (0–100) synthesizes the flood exposure component using both FEMA designation and 40-year empirical inundation evidence, alongside ground movement (up to 25 pts), soil risk (up to 20 pts), terrain slope (up to 15 pts), and impervious cover (up to 10 pts). Scores are absolute and rule-based — not population percentiles. InSAR coverage is Caddo and Bossier only; DeSoto ground movement component scores 0 by design.

Buyers

→ P&C insurance underwriters pricing multi-peril exposure
→ Mortgage lenders screening portfolios for compounding physical risk
→ Municipal engineers prioritizing inspection and capital expenditure
→ Environmental and geotechnical consultants needing pre-site intelligence
→ Researchers and journalists studying climate and land-use risk

Delivery

·Flat CSV, parcel-level — one row per parcel, all layers joined
·237,808 parcels across Caddo, Bossier, and DeSoto parishes
·Quarterly refresh — LiDAR, NLCD, SSURGO, and JRC layers updated Jan/Apr/Jul/Oct
·InSAR velocity updated annually as new satellite passes are processed

Dataset Fields

parish

Caddo, Bossier, or DeSoto

parcel_id

Caddo GEOGNO (15-digit), Bossier parcel ID, or DeSoto parcel ID

address

Property address

flood_zone

FEMA NFHL flood zone designation (AE, X, AO, etc.)

bfe_elev_ft

FEMA Base Flood Elevation at parcel centroid (feet, NAVD88). NULL for Zone X parcels.

ground_elev_ft

LiDAR-derived ground elevation at parcel centroid (USGS 3DEP 10m, feet NAVD88)

est_ffl_ft

Estimated finished floor elevation: ground_elev_ft + 1.0 ft slab-on-grade offset

freeboard_ft

Margin above BFE. Negative = parcel centroid already below BFE. NULL where no BFE contour.

jrc_occurrence

JRC Global Surface Water — percent of months water-covered 1984–2021 (0–100). Non-zero on Zone X parcels indicates flood history not captured by FEMA mapping.

jrc_max_extent

JRC 40-year maximum inundation flag (boolean). TRUE = water confirmed at this location at least once in the 1984–2021 satellite record.

precip_24hr_100yr

NOAA Atlas 14 100-year 24-hour precipitation depth (inches). Range: 9.68–11.90 in across tri-parish area.

precip_24hr_2yr

NOAA Atlas 14 2-year 24-hour precipitation depth (inches) — design storm baseline.

precip_24hr_10yr

NOAA Atlas 14 10-year 24-hour precipitation depth (inches).

precip_24hr_500yr

NOAA Atlas 14 500-year 24-hour precipitation depth (inches).

slope_deg

Terrain slope at parcel centroid in degrees (USGS 3DEP 10m). Median ~1° across the MSA.

nlcd_impervious_pct

NLCD 2021 percent impervious surface cover (0–100). 0 = non-urban/undeveloped.

nlcd_canopy_pct

NLCD 2021 percent tree canopy cover (0–100). NULL where canopy data unavailable.

velocity_vert_mmyr

InSAR vertical ground movement rate in mm/yr (negative = subsidence). Multi-track average where both Sentinel-1 tracks cover the parcel.

velocity_vert_t63_mmyr

Track 63 individual velocity, CORS-calibrated. Caddo and Bossier only.

velocity_vert_t136_mmyr

Track 136 individual velocity, CORS-calibrated. Caddo and Bossier only.

drainage_class

SSURGO soil drainage class (e.g., Well drained, Poorly drained, Very poorly drained)

hydric_soil

SSURGO hydric soil designation (boolean). Hydric soils indicate wetland conditions and elevated foundation risk.

shrink_swell_lep

SSURGO linear extensibility percent — soil shrink-swell potential. LEP > 6 is high; > 9 is very high.

corrosion_concrete

SSURGO concrete corrosion class (Low / Moderate / High). Indicates soil chemistry risk to buried infrastructure.

physical_risk_score

Composite Physical Risk Score (0–100). Five components: flood exposure incorporating FEMA zone + 40-year JRC inundation history (0–30), ground movement (0–25), soil risk (0–20), terrain slope (0–15), and impervious cover (0–10). Deterministic — no training set, no percentile ranking.

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