Scour Evaluation Program National Status Report

1
Scour Evaluation Program National Status
Report

• Eastern/Southern Resource Centers
• Hydraulic Engineers Conference
• July 18, 2000
• Jorge E. Pagán-Ortiz
• (e-mail jorge.pagan_at_fhwa.dot.gov)
• Federal Highway Administration
• Office of Bridge Technology
• Washington, D.C.

2
Current Status (04/15/00)

• Bridges over waterways 481,446
• Screened by Categories 481,367 (100 )
• Low risk
  331,969 (68.9)
• Unknown foundations 91,094
  (18.9)
• Tidal
  920 ( 0.2)
• Scour susceptible 32,553
  ( 6.8)
• Scour critical
  24,831 ( 5.2)
• Not Screened 79
  ---

3
Scour Evaluation Status
4
Scour Evaluation Summary

• Evaluations Completed 356,800 (91.6)
• Evaluations Needed 32,632 ( 8.4)
• Evaluations Total 389,432 (100.0)

5
Status of Eastern/Southern Resource Center
DOTs

• Most of the State DOTs have completed at least
  90 of the evaluations.
• However, if we add the Unknown Foundations
  category, there would be a few State DOTs at 90
  completion (DC, DE, KY, NH, NY, OK, RI and VA).
• Nationally, 17 State DOTs would be at 90
  completion.

6
Unknown Foundations

• Evaluations should be conducted if the engineer
  has been able to identify the type and/or depth
  of bridge foundation.
• Team effort between FHWA field offices and FHWA
  customers to decide course of action.

7
Course of Action for Unknown Foundations

• Do nothing?
• Code bridge as 3 for item 113 (scour critical)?
• Monitoring?
• Rock riprap placement?
• Replace bridge?
• New technology needed?

8
Current Activities

• Updating HECs 18, 20 23
• Completion target date January 2001
• Updating HIRE
• Completion target date Spring 2001
• Revisions to NHI Course 13046
• Completion target date Spring 2001
• NCHRP
• Unknown Foundations, NCHRP 21-5(2)
• Methodology for Predicting Channel Migration,
  NCHRP 24-16
• Development of Portable Scour Monitoring
  Equipment, NCHRP 21-7

9
Future Activities

• Develop New NHI Course on Countermeasures
• Sediment Transport Modeling
• NCHRP
• Project 24-7(2), Bridge Pier Scour
  Countermeasures
• NCHRP Project 24-18, Large-Scale Abutment Scour
  Protection

10
Tidal Hydraulics

• Pooled-Fund Study
• Led by South Carolina DOT
• Includes most coastal states
• 1-D Workshop held in South Carolina on June 2000
• FHWA partnering with Pooled-fund State DOTs to
  develop an NHI Course on bridge tidal hydraulics.

11
Revisions to the Coding Guide

• Update descriptions and rating factors for
• Item 60
• Item 113
• Target date for revisions is September 2001