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90 SECTION 1 ADMINISTRATIVE ISSUES
Figure 3.7 Installing temporary pile bents on Peckman’s River Bridge.
3.5.4 Preventive Action against Foundation Scour
Performing scour analysis and use of effective countermeasures, such as deep foundations
and river training, may be required in addition to conventional shielding. Design of countermea-
sures will be based on HEC-23 procedures.
Scour countermeasure options include river training measures, dredging, driving sheet
piles around the piers and abutments, and filling the gaps with riprap. Alternate measures such
as grout bags, cable-tied blocks, and AJAX type blocks will be considered, based on tidal fl ow
conditions.
Figure 3.8 Overhead sign structure and integral abutment designed by author.
