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<br />I <br />I <br />il <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br /> <br />Lesson 4 <br /> <br />Demonstration and Problem Session - Participant Workbook <br /> <br />GENERAL SOLUTION PROCEDURE <br /> <br />Step 1. Select a culvert size, type of material, number of barrels, and inlet condition to <br />analyze. For our problem, this information was given. <br /> <br />Step 2. Complete the top portion of the Culvert Design Form, filling in all known <br />information. <br /> <br />Note that when given embankment data, the length of the culvert and the invert <br />and outlet elevations must be calculated based on the size and slope of the <br />barrel and embankment sideslope. The length of the barrel is based on where <br />the crown of the barrel intersects the embankment fill. Therefore, the barrel <br />length is shorter than distance between the upstream and downstream <br />embankment toe-of-slope, and the barrel invert elevations are slightly different <br />from the toe-of-slope elevations. <br /> <br />Step 3. Complete the inlet control calculations for the design discharge by filling in the <br />appropriate spaces on the Culvert Design Form, following the instructions given <br />in the footnotes. For our problem, use Chart 2 to calculate the inlet control <br />headwater depth. <br /> <br />Step 4. Complete the outlet control calculations for the design discharge by filling in the <br />appropriate spaces on the Culvert Design Form, following the instructions given <br />in the footnotes. For our problem, use Chart 6 to calculate the outlet control <br />headloss. <br /> <br />Step 5. Based on the concept of minimum performance, select the controlling <br />headwater elevation. <br /> <br />Step 6. Calculate the outlet velocity. <br /> <br />Step 7. Based on the headwater elevation and outlet velocity, evaluate the hydraulic <br />performance of the culvert. If not acceptable, select another configuration and <br />complete the analysis again. <br /> <br />Step 8. Repeat the calculations for other discharges to evaluate the culvert <br />performance curve, and plot the performance curve. <br /> <br />4-7 <br />