Magnitude and frequency of floods in the United States; part 1-B. North Atlantic slope basins, New York to York River

Flood magnitude-frequency relation applicable to streams in the North Atlantic slope basins, New York to York River, Va., are presented in this report. The relations are based on flood data collected at 487 gaging stations having 5 or more years of record not materially affected by regulation. For sites on most streams, the magnitude of a flood of any given frequency between 1.1 and 50 years can be determined from two curves - one expressing the relation between the mean annual flood and size of draining basin and the other expressing the ratio to the mean annual flood of floods of other recurrence intervals. For New Jersey streams, an adjustment to the mean annual flood is based on the percentage of surface area covered by lakes and swamps in the basin.