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Calculate the Design Flood Hydrograph for a Watershed and an SCS Design Storm:
*Referencing Part 630, Hydrology, Chapter 16, Hydrographs, National Engineering Handbook, USDA, NRCS this calculation is to be used to calculate the flood hydrograph for a watershed using an SCS design storm. For local SCS storms greater than 96 hours (4 days).
 
Calculation:
Designer/Checker:
   
Input:  
   
   
 
Enter the time of concentration (tc - hr)
Enter the gamma equation shape factor (m)
Select the SCS Synthetic Design Storm:
Rainfall (P - in or mm)
Enter SCS curve number (CN) for the drainage area
Drainage area (Am - sq mi or sq km)

 
   
 
Output:
 
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Time to peak, tp =
Unit peak discharge, qp =
Sum of dimensionless DUH coordinates =
Nondimensional time interval of DUH =
Peak rate factor, PRF =
Volume under hydrograph =
Runoff Volume, Vr =