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    What is the primary factor influencing uplift pressure on the underside of a barrel roof in a culvert?
    
    
        
    55. What is the primary factor influencing uplift pressure on the underside of a barrel roof in a culvert?
    
      - Barrel length
 
      - Soil type
 
      - Barrel diameter
 
      - Flow velocity
 
    
    Answer
    The correct answer is: D) Flow velocity
    Explanation
    Uplift pressure is directly related to the flow velocity of water passing through.