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Trial Design Culvert Selection - Box Culvert:
 
Calculation:
Designer/Checker:
 
Input:
 

 
Maximum Allowable Headwater Depth (HWmax - ft or m)
Design flow/discharge (Q - cfs or cms)
Maximum Allowable Culvert Rise/Height (Dmax - ft or m)
 
   
Output:  
   
Allowable Head (Hal) = HWmax - Dmax/2 =
Required Cross Section Area (AR) = 0.45Q/Hal^0.5 =
Total Width of Cross Section (W) = AR/Dmax =
   
Input:  
Largest Barrel Span (S - ft or m), for which W is a Multiple
     
   
   
Output:  
 
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Number of Box Sections (N) of Span (S) =
Design Discharge per Barrel (QN) =
 
 
 



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