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<br />Lesson 3 <br /> <br />Culvert Design - Participant Workbook <br /> <br />D. <br /> <br />The controlling headwater elevation is compared to the desired design <br />headwater, usually governed by overtopping considerations, to determine <br />if the assumed culvert size is acceptable. <br /> <br />INLET CONTROL NOMOGRAPH <br /> <br />OUTLET CONTROL NOMOGRAPH <br /> <br />o <br /> <br />Q <br /> <br />HWID <br /> <br />o 0 <br /> <br />H <br /> <br /> <br />L <br /> <br /> <br /> <br /> <br />T1J'n1ng <br />"M <br /> <br />3.30a Inlet Control Nomograph <br /> <br />3.30b Outlet Control Nomograph <br /> <br />NOTES: <br /> <br />3-14 <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 />