23 C.F.R. Appendix A to Subpart D of Part 635—Summary of Acceptable Criteria for Specifying Types of Culvert Pipes
Title 23 - Highways
Title 23: Highways
PART 635—CONSTRUCTION AND MAINTENANCE
Subpart D—General Material Requirements
Appendix A to Subpart D of Part 635—Summary of Acceptable Criteria for Specifying Types of Culvert Pipes
-------------------------------------------------------------------------------------------------------------------------------------------------------- Alternatives required AASHTO designations Type of drainage installation ---------------------------------------------------- to be included with Application Remarks Yes No Number alternatives--------------------------------------------------------------------------------------------------------------------------------------------------------Cross drains under high-type ............. X............ .................... .................... Statewide........... Any AASHTO-approved pavement.\1\ material.\2\Other cross-drain installations... X............ ............. 3 minimum........... M-170 and M-190..... ......do............ Do.\2\Side-drain installations.......... X............ ............. ......do............ M-36................ ......do............ Do.\2\Special installation conditions... ............. X............ .................... .................... Individual Specified to meet installation. special condi- tions.Special drainage systems (storm ............. X............ .................... .................... ......do............ Specified to meet sewers, inverted siphons, etc.). site require-ments.--------------------------------------------------------------------------------------------------------------------------------------------------------\1\ High-type pavement is generally described as FHWA construction type codes I, J, K, L, and plant mix and penetration macadam segments, respectively shown in the right-hand columns of type codes G and H having a combined thickness of surface and base of 7 in or more (or equivalent) or that are constructed on rigid bases.\2\ Types not included in currently approved AASHTO specifications may be specified if recommended by the State with adequate justification and approved by FHWA.
