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Calculate Discharge From A Weir Outlet Control With Free Discharge:
 
Calculation:
Designer/Checker:
 
Input:
 

(Note: All input Metric units are converted to English units for the equations below and then the output English units are converted back to Metric)
 
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Length of weir (Lw - ft or m)
Water surface elevation at design volume (Es - ft or m)
Elevation of crest of weir (Ew - ft or m)
Weir coefficient (Cw)

Typical values for Cw (English Units):
Rectangular weir - sharp crested: Cw = 3.33
Rectangular weir - broad crested: Cw = 2.861
Cipoletti trapezoid: Cw = 3.367
Ogee spillway: Cw = 3.97
   
   
   
Output:  
 
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Discharge, Q =
 
 
 
 
 



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