Appendix A to Subpart D of Part 635 - Summary of Acceptable Criteria for Specifying Types of Culvert Pipes

Type of drainage installationAlternatives requiredYesNoNumberAASHTO designations to be included with alternativesApplicationRemarksCross drains under high-type pavement.1XStatewideAny AASHTO-approved material.2Other cross-drain installationsX3 minimumM-170 and M-190......doDo.2Side-drain installationsX......doM-36......doDo.2Special installation conditionsXIndividual installationSpecified to meet special condi-tions.Special drainage systems (storm sewers, inverted siphons, etc.)X......doSpecified to meet 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.