FEDERAL TRIANGLE Flood Risk Management presented by Anthony Mondy - - PowerPoint PPT Presentation

U.S. General Services Administration

FEDERAL TRIANGLE Flood Risk Management

presented by

Anthony Mondy

Time Interval Duration Precipitation Return Frequency 9:00 PM – 11:00 PM 2 hours 3.34 inches 50-year 9:00 PM – 2:00 AM 6 hours 5.91 inches 200-year

Extreme Storm: Interior Drainage Flooding

June 25, 2006

15th Commerce 14th EPA West Mellon Auditorium EPA East 12th 10th IRS

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Annual Return Interval: Design Storm

Federal Triangle Flood Damage, June 2006

Federal Triangle Flood Damage, June 2006

Theater Abandoned Duct Bank Basement

Design Storm Contours

Greeley & Hansen: FT Storm Water Drainage Study (Modified)

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Design Storm Contours

GSA has recently completed an incremental risk assessment of each of the impacted buildings and identified cost effective flood protection measures.

Base Flood Elevations Interior Drainage

15th Commerce 14th EPA West Mellon Auditorium EPA East 12th 10th IRS

50 Year Storm 7.0 ft. 100 Year Storm: 7.7 ft. 200 Year Storm: 8.1 ft. 500 Year Storm: 8.6 ft.

9.6 7.45 10.1

Storm Water Pathway Top of Moat Wall Elevations

Federal Triangle Critical Pathways, June 2006

EPA IRS OPO

IRS Building:

Evaluate Utilizing Passive Floodgate at the Moats

Top of Moat Elevation 8.0 < 200 Year Storm Top of Moat Elevation 7.9 < 200 Year Storm Top of Moat Elevation 8.9 > 500 Year Storm

Floodgate TM

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Electrical Equipment Enclosure Vegetative Roofing Flood Doors New Chiller Room Rain Gardens Steam Tunnel Flood Door

Flex-Wall Installed inside of doorway to minimize impact to historic fabric. Critical Pathway for Flood Water Infiltration “Historic Building”

Federal Office Building:

New Flex Walls at Garage Ramps

Storm Main Failure PEPCO Duct Bank