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Hydraulic Lessons from Four Steuben County Bridges
Anthony J. Borrelli, PE
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
50-60% of bridge failures are due to hydraulics
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
The bridges examined
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Inspection data
Latest Bridge Ratings
Mulholland Road
(13 yrs)
CR115
(7 yrs)
CR85
(12 yrs)
Saunders Road
(9 yrs)
General Recommendation 7 7 7 7
Piles/Cap Footing CS-5 CS-5 CS-5 CS-5
Scour CS-1 CS-1 CS-1 CS-1
Stream Hydraulics CS-2 CS-1 CS-1 CS-1
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Scanning tour
Paul MongioviEric
Prutsman
Steve Catherman
Me
Ken Avery
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Mulholland Road o/Tioga River
STEUBEN CO.
Erwins
Chemung River Basin
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Bridge & site challenges
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
2004 CompletionA.L. Blades$2.9M
The new bridge
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Has the bridge been tested?
Low Chord
Bri
dge
C
on
stru
ctio
n
Dam
Co
nst
ruct
ion
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Debris collection issue
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Which pier nose is best?
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
A better span configuration?
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Facilitate debris removal
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
STEUBEN CO.
Lindley
Chemung River Basin
CR115 over the Cowanesque
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Bridge & site challenges
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
The new bridge
2010 CompletionRamsey Constructors$1.9M
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Shifted bridge location
Existing Bridge Abutments
~15 ft Shift North
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Justifying freeboard
~5 ft
1 ft
Pass 500-yr event / Max Dam Discharge + 10 Yr Tailwater on Tioga Reviewed ice jam history with USACE HEC-9 debris generation and delivery analysis Opening > largest log size anticipated Excess freeboard provided in main flow channel area
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Has the bridge been tested?
Bri
dge
C
on
stru
ctio
n
Low Chord
Dam
Co
nst
ruct
ion
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Unintended consequences?
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Sweat the small stuff
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
CR85 over Tuscarora Creek
STEUBEN CO.
Tuscarora
Chemung River Basin
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
County’s “scariest waterbody”
• Volatile
• Volume:o Drainage Area = 121 mi2
o Q50 = 18,600 cfs
• Velocity = ~15 fps
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
September 2004 collapse
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Bridge & Site challenges
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
The new bridge
2005 CompletionL.C. Whitford
$1.6M
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Has the bridge been tested?
Bri
dge
Co
nst
ruct
ion
Low Chord
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Solving approach erosion
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Quarried rock spurs
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Are they big enough?
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Quarried rock spurs as-built
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Quarried rock spurs today
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Make them a smidge bigger…
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Saunders Road over the Canisteo
STEUBEN CO.
Rathbone
Chemung River Basin
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Floodplain
Bridge & site challenges
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Q50 -7 feet freeboard
Bridge & site challenges
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
The new bridge
2008 Completion
Ramsey Constructors
$2.3M
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Non-Std Freeboard
Non-Std Sag Vert. Curve
Shallow Superstructure
Finding a balanced solution
D/S Armor
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Wingwall layout / flanking
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Has the bridge been tested?
Low Chord Bri
dge
C
on
stru
ctio
n
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Bank restoration - 2008
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Hands on bank restoration
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Bank restoration - today
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Looking forward• USGS / NYSDOT web-based
application
• Provides estimates of future peak flows for any stream/river in NY
• What we have seen so far:o Design storms generally increasing by less than
10% test bridge opening for this?o More frequent storms are more intense (~16%
increase) increased risks/delays during construction, increased maintenance
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Learning assessment
Q1. Which of the following factors affects debris collection at piers?a. Nosing geometryb. Pier location in the channel c. Presence of upstream control structuresd. All of the above
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Learning assessment
Q2. Which is not a form of bio-engineered stream bank protection?a. Rooted Stakesb. Wattlesc. Live Stakesd. Rip Rap
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
Learning assessment
Q3. Rock Spurs should be oriented in which direction?a. Downstreamb. Upstreamc. Perpendicular to the streamd. Parallel to the stream
NATIONAL FIRM. STRONG LOCAL CONNECTIONS.
For additional information or questions:
Anthony J. Borrelli, PE
Bridge Practice Leader280 East Broad Street
Rochester, NY 14604
Email: aborrelli@bergmannpc.com
Phone: 585.498.7777
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