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Calculate Peak Discharge (qp) By Graphical Peak Discharge Method:
*Referencing TR-55, Chapter 4, this calculation is to be used for calculating the peak discharge using the Graphical Peak Discharge method.
 
Calculation:
Designer/Checker:
   
Input:  
   
   
For Metric, all input units are converted for the calculation below then converted back for the output results. 
Enter the Composite Curve Number (CN) for the drainage area:
Select the SCS 24-hr Rainfall Type:
Cumulative rainfall (P - in or mm)
Time of concentration (tc - hrs)
Drainage area (Am - sq mi or sq km)
Runoff (Q - in or mm)
Pond and swamp adjustment factor (Fp)

 
   
 
Output:
 
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Ia/P =
Regression coefficient, C0 =
Regression coefficient, C1 =
Regression coefficient, C2 =
Unit peak discharge, qu =
Peak discharge, qp =
 
 
 
 



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