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<br />. Construction--Careful attention to construction details such as bedding, <br />compaction, as shown in exhibit 2, and trench width during installation <br />is important to the structural integrity of the culvert. Poor <br />compaction or poor quality backfill around culverts may result in uneven <br />settlement over the culvert and possibly structural distress of the <br />culvert. <br /> <br /> <br />",C,' <br /> <br />, ~ <br />:'~'~',1: <br />.."" " ~,,~, <br /> <br />Exhibit 2. Attention to construction details such as compaction, bedding, <br />and trench width is critical to proper culvert performance. <br /> <br />. Durability--Durability of material is a significant problem in culverts <br />and other drainage structures. In very hostile environments corrosion <br />and abrasion can cause deterioration of all commonly available culvert <br />materials. <br /> <br />. InsDection--The inspection and assessment of the structural condition of <br />culverts requires an evaluation of not only actual distress but <br />circumstantial evidence such as roadway settlement, pavement patches, <br />and embankment condition. <br /> <br />Until now, there has been little concise information available that deals <br />specifically with the inspection and evaluation of culverts. The purpose of <br />this manual is to meet this need for guidelines for the inspection of <br />structures functioning structurally and hydraulically as culverts regardless <br />of span length. <br /> <br />3 <br />