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<br /> <br />f <br />EMERGENCY BRACING NEEDED <br />DUE TO LOSS OF SUPPORT <br /> <br />VOID UNDER PIPE <br /> <br />Exhibit 43. Corrugated metal pipe arch with undermining and scour. <br /> <br />4-4.7 Culvert Barrel. <br /> <br />When the size of the barrel and flow of water permits, the full length of the <br />culvert should be inspected from the inside. Culverts with small diameters <br />can be inspected by looking through the culvert from both ends. The condition <br />of the culvert barrel is rated under SI&A items 62 and 67, which cover all <br />structural components of a culvert. The severity, extent, and location of <br />significant defects should be documented by narrative description, sketches, <br />and photographs, when possible. <br /> <br />It is very important to clearly identify problem locations in the inspection <br />report. Accurate comparisons of condition cannot be made on follow-up <br />inspections unless the locations of problems are documented. Locations in <br />sectional pipe can be referenced by using pipe joints as stations to establish <br />the stationing of specific cross-sections. Stations should start with number <br />1 at the outlet and increase going upstream to the inlet. The location of <br />points on a circular cross section can be referenced like hours on a clock. <br />The clock should be oriented looking upstream. On structural plate corrugated <br />metal culverts points can be referenced to bolted circumferential and <br />longitudinal seams. <br /> <br />The types of defects to look for when inspecting the culvert barrel will <br />depend upon the type of culvert being inspected. Culvert barrel defects are <br />described in detail in the Structural Components Inspection Guide found in <br />chapter 5 of this manual. In general, corrugated metal culvert barrels should <br />be inspected for cross-sectiona1-shape and barrel defects such as joint <br /> <br />6B <br />