Determining Peak Discharge for a 2.5-Hour Storm

Calculating Peak Discharge

To determine the peak discharge for a 2.5-hour storm with 2.5 cm of runoff using a 2.5-hr unit hydrograph with a peak discharge of 100 m3/s, we can follow these steps:

1. Convert the rainfall depth from centimeters to meters:
   2.5 cm = 0.025 m
2. Use the given unit hydrograph peak discharge of 100 m3/s and substitute it into the formula along with the rainfall depth of 0.025 m:
   Peak discharge = (0.025 m) x (100 m3/s)
   Peak discharge = 2.5 m3/s

Therefore, the peak discharge for a 2.5-hour storm with 2.5 cm of runoff would be 2.5 m3/s.