Supplemental Design
General Supplemental Design Standards
The following items have been approved by the SUDAS Board of Directors and available for use. These items will be included in the 2026 Edition of the SUDAS Design Standards in December. Click on the topic title for the marked up version of the revision; click on the section reference for a clean version of the section that incorporates the change.
Determining structure diameter (Sections 2C-3 and 3C-1, L, 10)
– Consider modifications based on National Precast Concrete Association (first version – approved in May)
– Propose additional revisions after the April regional meetings and May Board meeting (second version – approved in November)
Thrust block and anchor block sizing (Design Section 4C-1, K)
Modify thrust block sizing chart based on calculations. Add formula and table for anchor block sizing.
Asphalt mixture design criteria (Design Sect 5D-1)
Suggest deleting table from Design section since it is also included in the Specs.
Deleting duplicated spec figures (various)
Propose deleting spec figures that are duplicated in the design manual.
Page revised: November 17, 2025