Probable magnitude and frequency of floods on small stream in Virginia

The magnitude and frequency of floods are defined regionally for small streams (drainage area, 1 to 150 square miles) in Virginia. Curves are defined which show the relationship between the drainage area and the mean annual flood in four regions. Composite frequency curves for each region relate the magnitude of the annual flood, in ratio to the mean annual flood, to recurrence intervals of 1 to 50 years.

These two relationships are based upon annual peak flows at gaging stations with drainage areas less than 150 square miles and with records greater than 5 years. Gaging-stations which were materially affected by storage or diversion were not used.