During the scoping phase, a stormwater and hydraulic assessment is done for the project. If the assessment identified any parts of the existing stormwater drainage conveyance system (culverts, storm sewers, catch basins, manholes, inlets, grates, and ditches) to be repaired or replaced by the project, a physical inspection of the entire existing stormwater drainage conveyance system within the project limits is required. There may be condition ratings for some of these existing stormwater features in Highway Activities Tracking System (HATS) or the Stormwater Features Inventory that may aid in determining the physical inspection requirements. Contact the State Hydraulics Office for culvert Level 1 and Level 2 inspection requirements and guidelines. See the 2020 AASHTO Culvert and Storm Drain System Inspection Guide for guidance on inspecting storm sewer, catch basins, manholes, inlets, grates, and ditches.
