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2014 River Management Society Symposium Managing Rivers in Changing Climes: Training Tomorrow’s River
Professionals
Jon Zirkle, P.E.
May 1-2, 2010 On the above dates, a massive rainstorm swept through West
and Middle Tennessee. A 1000+ year rainfall event. The storm crossed the Mississippi River, north of Memphis,
and swept northeast through Nashville. Many areas received from 13 to 18 inches of rain in less than a
48 hour period. According to NOAA Atlas 14, the 1000 year 48 hour rainfall
event in Middle Tennessee is 11.7 inches. Streams and major rivers responded with flood elevations
ranging from less than a 50 year event to 4 ft above the expected 500 year event.
Affected Area
Heavy Flooding Occurred
Statistics 21 Deaths occurred in Tennessee due to the flood.
52 of Tennessee’s 95 Counties were declared as Federal
Disaster Areas.
Damages in Tennessee were expected to be over $2 billion dollars.
$45M in FHWA authorized emergency repairs alone
Expected Damage Landslides above and below the road
Pavement and shoulder damage, debris and down power lines
Unusual Damage
Unusual Damage
Unusual Damage
What about the Highway Bridges? 44 of the 52 Counties had bridges that suffered
maintenance issues because of the flood. The total stands at 1,167 structures with damage.
These 44 Counties have a total of 10,216 highway bridges over waterways.
Therefore, only 11.4 % of bridges over waterways needed maintenance. 88.6 % of the highway bridges survived the flood with NO SIGNIFICANT DAMAGE.
Tracking the Damage In order to track the damage, a database table for
flood damaged bridges was created.
Five categories of damage were tracked.
Bridges could have multiple types of damage.
If the bridge required closure, that was also noted.
Debris Accumulation
Debris Accumulation
Debris Accumulation
Debris Accumulation
Approach Roadway Damage
Approach Roadway Damage
Approach Roadway Damage
Approach Roadway Damage
Embankment Erosion
Embankment Erosion
Bridge Scour
Bridge Scour
Bridge Scour
Structural Damage
Structural Damage
Structural Damage
Structural Damage
Summary of Flood Damage Our Database shows damage to 1,167 Highway
Bridges 773 Bridges had a single type of damage 317 Bridges had two types of damage 65 Bridges had three types of damage 4 Bridges had four types of damage 1 Bridge has all five types of damage
Summary (Continued) 504 Bridges showed debris accumulation 415 Bridges had damage to the roadway
approaches At 362 Bridge Sites, there was channel
embankment erosion 225 Bridges showed scour damage 115 Bridges suffered some type of structural
damage 54 Bridges required closure
Bridge Design
Bridge Design
River Training
Bendway weirs
Rock spurs
Questions?
Jon Zirkle, PE C.E. Manager 1
TDOT Hydraulics Section Suite 1200, J.K. Polk Bldg.
505 Deaderick Street Nashville, TN 37243 [email protected]
