Hydraulic Lessons from Four Steuben County Bridges€¦ · ~5 ft 1 ft Pass 500-yr event / Max Dam...

Hydraulic Lessons from Four Steuben County Bridges

Anthony J. Borrelli, PE

NATIONAL FIRM. STRONG LOCAL CONNECTIONS.


50-60% of bridge failures are due to hydraulics


The bridges examined


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


Scanning tour

Paul MongioviEric

Prutsman

Steve Catherman

Me

Ken Avery


Mulholland Road o/Tioga River

STEUBEN CO.

Erwins

Chemung River Basin


Bridge & site challenges


2004 CompletionA.L. Blades$2.9M

The new bridge


Has the bridge been tested?

Low Chord

Bri

dge

C

on

stru

ctio

n

Dam

Co

nst

ruct

ion


Debris collection issue


Which pier nose is best?


A better span configuration?


Facilitate debris removal


STEUBEN CO.

Lindley

Chemung River Basin

CR115 over the Cowanesque


The new bridge

2010 CompletionRamsey Constructors$1.9M


Shifted bridge location

Existing Bridge Abutments

~15 ft Shift North


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



Bri

dge

C

on

stru

ctio

n

Low Chord

Dam

Co

nst

ruct

ion


Unintended consequences?


Sweat the small stuff


CR85 over Tuscarora Creek

STEUBEN CO.

Tuscarora

Chemung River Basin


County’s “scariest waterbody”

• Volatile

• Volume:o Drainage Area = 121 mi2

o Q50 = 18,600 cfs

• Velocity = ~15 fps


September 2004 collapse


Bridge & Site challenges


The new bridge

2005 CompletionL.C. Whitford

$1.6M



Bri

dge

Co

nst

ruct

ion

Low Chord


Solving approach erosion


Quarried rock spurs


Are they big enough?


Quarried rock spurs as-built


Quarried rock spurs today


Make them a smidge bigger…


Saunders Road over the Canisteo

STEUBEN CO.

Rathbone

Chemung River Basin


Floodplain



Q50 -7 feet freeboard



The new bridge

2008 Completion

Ramsey Constructors

$2.3M


Non-Std Freeboard

Non-Std Sag Vert. Curve

Shallow Superstructure

Finding a balanced solution

D/S Armor


Wingwall layout / flanking



Low Chord Bri

dge

C

on

stru

ctio

n


Bank restoration - 2008


Hands on bank restoration


Bank restoration - today


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


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


Learning assessment

Q2. Which is not a form of bio-engineered stream bank protection?a. Rooted Stakesb. Wattlesc. Live Stakesd. Rip Rap


Learning assessment

Q3. Rock Spurs should be oriented in which direction?a. Downstreamb. Upstreamc. Perpendicular to the streamd. Parallel to the stream


For additional information or questions:

Anthony J. Borrelli, PE

Bridge Practice Leader280 East Broad Street

Rochester, NY 14604

Email: [email protected]

Phone: 585.498.7777

Hydraulic Lessons from Four Steuben County Bridges€¦ · ~5 ft 1 ft Pass 500-yr event / Max Dam...

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Transcript of Hydraulic Lessons from Four Steuben County Bridges€¦ · ~5 ft 1 ft Pass 500-yr event / Max Dam...