HEC-23
HEC-20
HEC-18
Bridge Scour and Stream
Stream Stability and
Hydrologic, Hydraulic
Instability Countermeasures
Geomorphic Assessment
and Scour Analysis
Develop Plan of Action
Hydrologic Analysis
Office Data Collection & Site Visit
Evaluate CM
Options with Matrix
Hydraulic Analysis
Yes
Sufficient
Data
Tidal
Hydraulic
Riverine
Structural
Select CM
No
Type
Field Data Collection
Structural /
Scour Analysis
Geotechnical
Monitoring
Input
Define / Classify Stream
Design CM /
Monitoring Plan
Plot Scour Prism
Evaluate Stream Stability
Environmental
Considerations / Permitting
Multi Disciplinary Evaluation
Assess Stream Response
Hydraulics/Structures/Geotechnical
Evaluate CM Impact
Establish Level of Analysis
Yes
No
Structure
Low Risk
(New Bridge,
Stable
Acceptable
No
revise design)
New
Bridge
CM Impact
No
(Existing Bridge)
Type
Scour Critical: Plan of Action Required
Yes
Existing
Install CM /
Implement Monitoring Plan
Scour
No
Yes
CM
Low Risk
No
Yes
Susceptible
Replace
Viable
Bridge
Inspection & Maintenance
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