SAFETY INSPECTION OF IN-
SERVICE BRIDGES: CHAPTER 11
WITH COMPLETE SOLUTIONS
Elements of a Channel (List): - ANSWER-Channel
Streambed
Embankments
Stream FLow
Freeboard
Floodplain
Hydraulic Opening
Hydraulic Control Structures
Channel (definition): - ANSWER-The well-defined depression, which contains and
guides stream flow during normal flow conditions
Streambed (definition): - ANSWER-The bottom or floor of the Channel
Streamflow (definition): - ANSWER-The water, suspended particles, chemicals, and
any debris moving through the channel
Streamflow - ANSWER-________ is the water, suspended particles, chemicals, and
any debris moving through the channel.
Hydraulic Opening (definition): - ANSWER-The ________ is the entire area beneath
the bridge, which is available to pass flood flows.
Floodplain (definition): - ANSWER-The ________ is the overbank area outside the
channel that carries flood flows in excess of channel capacity.
Streambed (definition): - ANSWER-The "thalweg" elevation defines the lowest
elevation of the ________.
Freeboard (definition): - ANSWER-________ is the term used to describe the
distance from the bottom of the superstructure to the top of the water surface.
Riprap (definition): - ANSWER-Properly sized and graded rock that is either natural
or manmade, placed adjacent to abutments, piers, or along embankments.
Degradation (definition): - ANSWER-The gradual and even lowering of the
streambed elevation.
Contraction Scour (definition): - ANSWER-The lowering of the entire streambed
under the structure only
SERVICE BRIDGES: CHAPTER 11
WITH COMPLETE SOLUTIONS
Elements of a Channel (List): - ANSWER-Channel
Streambed
Embankments
Stream FLow
Freeboard
Floodplain
Hydraulic Opening
Hydraulic Control Structures
Channel (definition): - ANSWER-The well-defined depression, which contains and
guides stream flow during normal flow conditions
Streambed (definition): - ANSWER-The bottom or floor of the Channel
Streamflow (definition): - ANSWER-The water, suspended particles, chemicals, and
any debris moving through the channel
Streamflow - ANSWER-________ is the water, suspended particles, chemicals, and
any debris moving through the channel.
Hydraulic Opening (definition): - ANSWER-The ________ is the entire area beneath
the bridge, which is available to pass flood flows.
Floodplain (definition): - ANSWER-The ________ is the overbank area outside the
channel that carries flood flows in excess of channel capacity.
Streambed (definition): - ANSWER-The "thalweg" elevation defines the lowest
elevation of the ________.
Freeboard (definition): - ANSWER-________ is the term used to describe the
distance from the bottom of the superstructure to the top of the water surface.
Riprap (definition): - ANSWER-Properly sized and graded rock that is either natural
or manmade, placed adjacent to abutments, piers, or along embankments.
Degradation (definition): - ANSWER-The gradual and even lowering of the
streambed elevation.
Contraction Scour (definition): - ANSWER-The lowering of the entire streambed
under the structure only
