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Atrium Office Building Drainage/Flooding Assessment
Atrium Office Building, Boca Raton, FL

The Atrium is a multi-story office building complex located at 611 Broken Sound Parkway NW, in Boca Raton, Florida. The site is situated within the ARVIDA Park of Commerce regional drainage area. The site discharges to the east towards the Lake Worth Drainage District (LWDD) Canal.


Problem: During rainfall precipitation of over 0.5 inches and up, the enclosed lower parking garage experienced flooding depths approaching the bumpers of parked cars. A preliminary video (CCTV) inspection and cleaning of the storm sewer pipes did not indicate the occurrence of a blockage that would cause the flooding problem.


Solution: WRMA was retained to perform an assessment of the causes of the flooding and to recommend possible mitigating courses of action. WRMA performed a hydrologic study of the Atrium site drainage area including paved and unpaved areas draining to the stormwater management system, a hydraulic study of the stormwater management system of inlet grates, pipes and control structure discharging to a nearby perimeter outfall ditch, an alternative flood mitigation design, initial cost estimates of mitigating option and identified the necessary permit documentation for implementing the mitigating option. WRMA concluded that there were three potential problem area sources for the flooding taking place in the underground garage floor. Excess developed areas (parking areas)indicated that approximately 30%-40% additional pavement area was added to the development in 2005. This additional impervious area generated excess runoff during storm events that was not originally factored in the originally engineering design. Additionally, an unaccounted inlet was was placed at a lower stage than the rest of the system and during storm events. The inlet had been collecting significant volumes of runoff which had the potential to overflow into the building.


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