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Palm Beach County Flood Information


As a relatively flat, low lying, heavily developed coastal county that experiences frequent intense rain events and periodic tropical storms, Palm Beach County is especially susceptible to flooding.

Palm Beach County flooding has historically taken one of the following forms:

  1. Flash flooding resulting in the rapid buildup of flood waters from intense localized precipitation that exceeds drainage capacities
  2. General flooding resulting from a buildup of water levels over time
  3. Water body overflows resulting from excessive rainfall or water management actions
  4. Coastal surge flooding driven by storm-force winds
  5. Dike breaches or overtopping related to major rain and tropical storm events

Significant factors contributing  to inland flooding include rainfall intensity, rainfall frequency, rainfall duration, surface conditions, topography, and inadequate natural drainage .

Palm Beach County’s torrential rains, low and flat terrain, and large number of inland water bodies, conspire to create a significant probability for inland flooding. An additional, increasingly significant, contributing factor is rapid water runoff associated with the vast areas of impervious surfaces created by new development, creating flood prone areas where they did not previously exist.

In urban areas grates and drains can become overtaxed or blocked  with debris, leaving no space for excess water to enter drainage and sewer systems.

Palm Beach County averages over 60 inches of rain a year and more than 130 rain days, with most of it coming between the months of June and November. Most developed areas are clustered along the coasts or near large waterways. Virtually flat, with most areas at or only slightly above sea level, even moderate rains can accumulate quickly.

More information is available on the County’ Flood Information website at:      


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