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What is the value of abutment contraction coefficient for square abutment with headwall perpendicular to the direction of flow?

What is the value of abutment contraction coefficient for square abutment with headwall perpendicular to the direction of flow? Correct Answer 0.2

For square abutment with headwall at 90° to the direction of the flow, the abutment contraction coefficient is 0.2. For rounded abutment with headwall at 90° to the direction of flow, the value is taken as 0.1.

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