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<br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />:, <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Lesson 1 <br /> <br />Introduction - Participant Workbook <br /> <br />E. <br /> <br />Culvert Failure Concerns <br /> <br />1.13 Scour Failure <br /> <br /> <br />1.14 Buoyancy/anchoring Failure <br /> <br /> <br /> <br />1.15 Excessive Outlet Velocity <br /> <br />When culverts fail, the results usually are not catastrophic but, because of <br />their large numbers on highway systems and therefore, high frequency of <br />potential loss, failures are costly and cause considerable interference with <br />normal traffic flow. <br /> <br />1-7 <br />