Assessment at a glance

Flood inundation simulation modeled depth

Opacity

Compare 2040 ↔ 2070 (swipe)

Critical assets with ≥ 6 in of modeled water. Hover the map for depth. Shown within the Town boundary; depth grids include permanent canals and lakes.

Layers

Town of Davie boundary Dim area outside the Town Primary focus areas (Tier 1–3) Secondary focus areas (all assets) Critical assets (scored)

Color assets by

Filter assets

District

Asset type

Min. priority0.00

Hide roadway segment points

Highest-priority assets click to zoom

Assets by class

Priority score distribution

Mitigation focus areas

High-priority assets were clustered with Getis-Ord Gi* hot spot analysis. Significant hot spots (90–99 % confidence) were buffered 750 ft and dissolved into focus areas, then each area was scored on the mean and maximum priority and the number of assets it contains. Primary focus areas use point and polygon facilities and are ranked into tiers. Secondary focus areas also include roadway assets.

Focus area score

Secondary focus areas (points, polygons and roadways)

Methodology

A reproducible, GIS-based framework that turns modeled flood scenarios into a single, comparable priority score for every critical asset, and then into the places where mitigation money does the most good. Point, polygon and roadway assets are scored with the same structure so they can be ranked together.

ArcGIS ProPython (pandas · NumPy · ArcPy)Hydrodynamic flood scenariosGetis-Ord Gi*Spatial joins & fishnet aggregationLeaflet · Chart.js (this site)

Workflow

1 · ScenariosHydrodynamic depth grids (1 m), for example 10-yr 24-hr 2040 and 500-yr 24-hr 2070 rainfall; Rainfall (R_), tidal / sea-level rise and storm surge (TSLR_, S_) and compound (C_) flood depths for current, 2040 and 2070 horizons

2 · ExposurePer-scenario impact: depth at points, depth × % flooded for polygons, depth per roadway segment

3 · MetricsHazard-family means, average depth, times exposed, depth percentile, horizon index

4 · PriorityFlood Risk Index → Composite Index → criticality-boosted Priority Score

5 · Hot spotsGetis-Ord Gi* on the merged asset set; roadways thinned on a 1,000 ft fishnet

6 · Focus areasGi_Bin ≥ 1 buffered 750 ft, dissolved, scored and ranked into Tier 1–3

Scoring formulas

Flood Risk Index

Weighted, normalized exposure. Rainfall is weighted highest because it is the dominant flood driver in Davie.

Priority Score

Impactₛ = Depthₛ (points, roads)
Impactₛ = Depthₛ × %Floodedₛ (polygons)

Composite = 0.659·HorizonIndex + 0.34·FloodRiskIndex

PriorityScore = Composite × (1 + CriticalityNorm)

Horizon scores: current 10 · 2040 5 · 2070 1 · none 0, normalized 0–1. Criticality boosts hospitals, fire, police, evacuation routes and key utilities.

Focus Score & tiers

FocusScore = 0.40·MeanPriority + 0.30·MaxPriority + 0.30·AssetCount

Tier 1: highest-priority mitigation zones
Tier 2: secondary focus areas
Tier 3: monitoring and long-term planning (emerging risk)

All inputs normalized 0–1. Gi_Bin 3 / 2 / 1 = hot spot at 99 / 95 / 90 % confidence.

Why it matters

The score is more than a flood depth. It combines severity, how often an asset floods, which mechanism floods it, how soon, and what happens to the community when it fails. A fire station flooded today ranks above a park flooded only in 2070.

Focus areas move the answer from a ranked list to a map of where to invest. They feed capital improvement programming, grant applications and the Town's long-term resilience plan.

Exhibits

Map exhibits prepared for the assessment: critical assets within primary and secondary focus areas, district by district.