Hydrograph Method Calculator

Estimate the peak discharge from a watershed using the NRCS Unit Hydrograph method.
\[ Q_{\text{peak}} = \frac{4840\, A\, P}{T_p} \]

* Enter the watershed area (acres), rainfall excess (inches), and time to peak (min).

Step 1: Enter Parameters

Watershed Area, \( A \) (acres):

Example: 50 acres

Rainfall Excess, \( P \) (inches):

Example: 1.5 inches

Time to Peak, \( T_p \) (min):

Example: 60 minutes

Calculated Peak Discharge