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<br />D. Level 1 and 2 analyses will usually be required for most bridge design or <br />bridge evaluation projects, The need for Level 3 analysis must be <br />balanced by the time and money available. As the analysis becomes more <br />complicated, accounting for more factors, the level of effort becomes <br />proportionally larger. <br /> <br />E, HEC-20 Chapter 4 (pp. 45-57) provides a generalized discussion of the <br />Level 1 Qualitative Analysis steps, The Participant should review the <br />generic discussion of each of the Level 1 steps, To illustrate the <br />application of a Level 1 analysis to an actual problem in the field, the <br />remainder of this lesson will present a Level 1 analysis of the causes of the <br />March 10, 1995 failure of the 1-5 bridges near Coalinga, California. <br /> <br />NOTES: <br /> <br />4,2 <br />