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Streambed Erosion Hazard Recognition & Countermeasures for Railroad
Embankments & Bridges


New York, NY

July 19, 2012


Lesson 1 Introduction

2


LESSON 1


Lesson 1 Introduction

3

INSTRUCTOR INTRODUCTION

Steve Hill, P.E.


Caltrain



San Carlos, California, hills@samtrans.com

Currently Chief Engineer, Track and Structures

Over 35 years of experience working for railroads

Instructor for American Railway Engineering and Maintenance
-
of
-
Way Association (AREMA) course
on stream bed hazard recognition for Class I railroads

Range of experience includes section laborer, assistant division manager, project manager for US
and Canadian Class I railroads

First
-
hand experience dealing with the results of scour and implementing preventive measures


Eri
ch Schmitz, P.E.
-

TranSystems


Kansas City, Missouri, egschmitz@transystems.com

Water Resources Engineer

Pursuing Ph.D. in the field of bioengineered stormwater solution performance

Adjunct Professor of fluid mechanics and stream stability and scour for the University of Missouri


Kansas City

Published author in the fields of engineering education and
computational

hydraulics

Specialized

experience

in
performing

geomorphic

analyses,
hydraulic

studies
,
stream

stability

and
scour

countermeasure

design,
sediment

transport and
scour

analysis





Lesson 1 Introduction

4

COURSE GOALS AND OBJECTIVES


Characterize stream instability and scour problems
at railroad bridges

Causes and types of scour

Inspecting for scour

Show how to estimate the likely magnitude of scour
at bridges during floods

Illustrate common countermeasures for bridge scour
and stream instability

Provide guidance on selection of countermeasures

Illustrate, using actual case studies

Lesson 1 Introduction

5

MORNING LESSON SCHEDULE

SCOUR INSPECTION

1.
Seminar Introduction

2.
Recognizing Mechanisms, Causes, and Types of Scour
and Erosion during Inspections

3.
Scour and Erosion at Railroads

4.
Stream Stability and Geomorphology




*See notebooks for hourly breakdown


Lesson 1 Introduction

6

AFTERNOON LESSON SCHEDULE

SCOUR COUNTERMEASURES

5.
Estimating Scour Depths

6.
Bridge and Culvert Scour Countermeasures

7.
Stream Instability Countermeasures

8.
Selection of Countermeasures

9.
Scour Countermeasure Case Studies

Lesson 1 Introduction

7

REFERENCE MATERIALS

FHWA Publications

HEC
-
18


Evaluating Scour at Bridges

HEC
-
20


Stream Stability at Highway Structures

HEC
-
23


Bridge Scour and Stream Instability Countermeasures:
Experience, Selection, and Design Guidance

http://www.fhwa.dot.gov/engineering/hydraulics/index.cfm




AREMA
Manual for Railway Engineering

Chapter 1


Roadway and Ballast, Part 3


Natural Waterways



Lesson 1 Introduction

8

ACRONYMS

AREMA

American Railway Engineering and Maintenance
-
of
-
Way
Association

FHWA

Federal Highway Administration

HEC

Hydraulic Engineering Circular

NHI

National Highway Institute

Lesson 1 Introduction

9

SCHOHARIE CREEK BRIDGE FAILURE

Interstate 90 bridge over Schoharie Creek near Fort
Hunter, New York

Failure occurred on April 5, 1987

10 lives lost

Cause: Severe scour in the soil beneath the pier
spread footings

Result: FHWA, HEC
-
18


Evaluating Scour At Bridges

Lesson 1 Introduction

10

SCHOHARIE CREEK BRIDGE FAILURE

October 2011 aerial

Lesson 1 Introduction

11

SCHOHARIE CREEK BRIDGE FAILURE

Lesson 1 Introduction

12

SCHOHARIE CREEK BRIDGE FAILURE

Lesson 1 Introduction

13

SCHOHARIE CREEK BRIDGE FAILURE

Photograph of riprap at pier 2, October 1956

Lesson 1 Introduction

14

SCHOHARIE CREEK BRIDGE FAILURE

Photograph of riprap at pier 2, August 1977

Lesson 1 Introduction

15

SCHOHARIE CREEK BRIDGE FAILURE

Lesson 1 Introduction

16

Reconstructed I
-
90 Bridge over Schoharie Creek

SCHOHARIE CREEK BRIDGE FAILURE