Atlanta (Fulton County), GA Flood Zone & Drainage Map

Address
Overview

Where does rainwater drain in Atlanta? This interactive map shows surface drainage patterns across Atlanta, Georgia, 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.

For a Atlanta property, compare terrain-based drainage with the separate FEMA flood zone layer. FEMA records 2,143 flood insurance claims in Atlanta since 1978, the most in 2009 (Late summer storms). Inside city limits the ground ranges from about 767 to 1,046 feet above sea level (USGS 3DEP). Terrain flow lines are not a record of past flooding at a house or a prediction of stormwater depth. 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 Atlanta, GA: modeled paths where rainwater runs and collects, from USGS 3DEP elevation data, with the city boundary Click any spot on the map to analyze it
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Atlanta flood history

FEMA records 2,143 flood insurance claims in Atlanta since 1978. 35% 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, Atlanta ranks #11 for FEMA flood insurance claims per home: 8.1 claims per 1,000 homes since 1978 (2,143 claims within city limits). See all 50 cities

Bar chart of FEMA flood insurance claims per year in Atlanta, GA, 1978 to 2026, highest in 2009 (Late summer storms) with 428 claims.

Biggest flood years

  1. 2009 · Late summer storms · 428 claims
  2. 2004 · Tropical Storm Ivan · 276 claims
  3. 2024 · Hurricane Helene · 245 claims
  4. 1990 · 137 claims
  5. 1979 · 130 claims

ZIP codes with the most claims

ZIPClaimsShare
3032770332.8%
3034226112.2%
3030526012.1%
303091818.4%
303241054.9%
30318984.6%
30308884.1%
30311723.4%

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. They are the claims rated in the city’s own NFIP community, which covers the city limits. ZIP codes are as reported on the claims, and a ZIP code can extend beyond the city. 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 Atlanta

Sunlight. Ground here gets about 4.7 kWh of sunlight per square meter per day on average, above the middle of the lower 48 (4.5). South-facing slopes get more, north-facing ones less.

Soil. The ground is mostly loamy soil over a clay-rich subsoil (Acrisols 98%). Rain soaks in, then slows at the clay layer.

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