Miami (Miami-Dade County), FL Flood Zone & Drainage Map

Address
Overview

Where does rainwater drain in Miami-Dade County? This interactive map shows surface drainage patterns across Miami, Hialeah, Miami Beach, and surrounding areas based on terrain shape - where gravity directs rainwater based on elevation and slope. For official flood risk information, see the FEMA flood zone layer on the Hazards tab.

Miami-Dade County averages just 8 feet above sea level on porous limestone bedrock, making traditional surface drainage unreliable. The county depends on an engineered canal system (C-6, C-7, C-8) managed by the South Florida Water Management District. Rising sea levels and king tides increasingly compromise gravity-fed drainage outfalls. Choose a location to see surface drainage analysis and water flow direction based on terrain shape. The first three locations are free.

Interpretation

Select a location on the map or enter an address to see terrain analysis.

3D Terrain Visualization
Where does rainwater flow based on terrain shape? Blue areas show where water collects and drains downhill.
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Terrain drainage map of Miami-Dade County, FL: modeled paths where rainwater runs and collects, from USGS 3DEP elevation data, with the county boundary Click any spot on the map to analyze it
4.0× Horizontal:Vertical
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Miami-Dade County flood history

FEMA records 62,029 flood insurance claims in Miami-Dade County since 1978, with about $856 million paid. 9% of the claims with a rated flood zone came from moderate- or low-risk zones (X, B or C), outside the high-risk areas on FEMA’s flood maps.

Among the 50 largest U.S. cities, Miami ranks #4 for FEMA flood insurance claims per home: 30.4 claims per 1,000 homes since 1978 (6,792 claims within city limits). See all 50 cities

Bar chart of FEMA flood insurance claims per year in Miami-Dade County, FL, 1978 to 2026, highest in 1999 (Hurricane Irene) with 13,393 claims.

Biggest flood years

  1. 1999 · Hurricane Irene · 13,393 claims
  2. 2000 · 11,091 claims
  3. 2005 · Hurricane Katrina · 9,717 claims
  4. 1992 · Hurricane Andrew · 8,390 claims
  5. 2017 · Hurricane Irma · 4,100 claims

ZIP codes with the most claims

ZIPClaimsShare
331773,7786.1%
331863,4515.6%
331612,6114.2%
331752,4834.0%
331572,0033.2%
331491,8313.0%
331661,7112.8%
331731,5732.5%

How to read this. These are National Flood Insurance Program claims, so they count only insured buildings and miss flooding where owners had no flood insurance. FEMA publishes them without names or addresses: they show which years and areas flooded, never whether a particular house did. ZIP codes are as reported on the claims, and a ZIP code can extend beyond the county. The “rated” flood zone is the one used to price the policy and may come from an older map. Data as of 2026-09-08, from FEMA OpenFEMA.

Next: look up the flood zone for an address · how to check whether a specific house has flooded · why Zone X can still flood · how to read the drainage map

Sunlight and soil in Miami-Dade County

Sunlight. Ground here gets about 5.2 kWh of sunlight per square meter per day on average (5.0 to 5.5 across the map), above the middle of the lower 48 (4.5). South-facing slopes get more, north-facing ones less.

Soil. The ground is mostly thin soil over rock (Leptosols 29%), with waterlogged soil (Gleysols 23%). There is little soil to hold rain; what happens next depends on the rock below.

The Solar and Soil tabs on the map above show both for any address. Read more: how much sun does my property get? · what soil type is my property, and how it affects drainage

Sunlight: long-term average on flat ground from the National Solar Radiation Database (National Laboratory of the Rockies, formerly NREL). Soil: most likely soil types from ISRIC SoilGrids, a 250 m model, not a survey of any lot. Both cover the map area above.

Explore more flood and drainage maps

Browse all 64 flood and drainage maps · Flood insurance claims in the 50 largest cities · How Terreflow uses terrain and FEMA data