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This “state of the practice” report evaluates and summarizes current methods of grade control at culverts with photographic examples of each type of culvert grade control. It is intended to be used as a reference to help engineers in the preliminary design stage select the most cost-effective and constructible type of culvert grade control based primarily on the amount of grade needing controlled. While some culvert projects are designed to include grade control to achieve hydraulic efficiency and capacity at the inlet or to dissipate energy at the outlet, here we give engineers an end product to shoot for to reverse engineer a culvert that requires a significant drop in elevation. This publication does not replace other design considerations, methodologies, guidance, or manuals.

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