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<br />Lesson 4 <br /> <br />Demonstration and Problem Session - Participant Workbook <br /> <br />The Rational method was used to determine the following values on a flood- <br />frequency curve: <br /> <br />· Q50 = 93 cfs <br />· Q100 = 175 cfs <br /> <br />The rating curve for the downstream channel was calculated by normal depth <br />analysis: <br /> <br />Q(cfs) TW V (ft/sec) <br /> (ft) <br />0 0.00 <br />50 4.00 2.5 <br />93 4.50 2.9 <br />150 4.84 3.2 <br />175 4.95 3.8 <br /> <br />Note that the maximum average stream velocity (for 175 cfs) is 3.8 fps. <br /> <br />REQUIRED SOLUTION: <br /> <br />Complete all necessary calculations and and plot the performance curve for the <br />following assumed culvert configuration: <br /> <br />Shape: Circular <br />Size: 4 - 36" CSP <br />Material: Steel <br />Entrance: headwall - square edge <br /> <br />SOLUTION PROCEDURE: <br /> <br />Complete the Culvert Design Form, using the printed nomographs in HDS No.5. <br /> <br />4-6 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />