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<br />I <br />I <br />II <br /> <br />Lesson 4 <br /> <br />Demonstration and Problem Session - Participant Workbook <br /> <br />4.2 CULVERT DESIGN WORKSHOP <br /> <br />PROBLEM STATEMENT <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 /> <br />A culvert crossing must be designed for a new roadway. The site survey <br />project file contains: <br /> <br />. USGS, site, and location maps <br />. roadway profile <br />. embankment cross section <br /> <br />From this information, the following schematic drawing of the roadway <br />embankment was prepared: <br /> <br />EI. 255.6 <br /> <br />y <br /> <br />5 = 0.005 <br /> <br />~ <br />~; <br />,N <br />co . <br />- - <br />lIlW <br /> <br />L/).., <br />co . <br />+ I'- <br />..,"" <br />.N <br />co . <br />- - <br />lIlW <br /> <br />Site visit notes indicate: <br /> <br />. no significant debris potential from the watershed to be served by the <br />culvert <br />. no nearby structures. <br /> <br />The design criteria for this project is: <br /> <br />. 50-year frequency for design <br />. allowable headwater elevation = 252.00 due to the elevation of a <br />different roadway upstream of the subject culvert <br />. 1 DO-year frequency for check <br /> <br />4-5 <br />