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Flood frequency: expected and unexpected probabilities

Open-File Report 76-775

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Abstract

Flood-frequency curves may be defined either with or without an ' expeced probability ' adustment; and the two curves differ in the way that they attempt to average the time-sampling uncertainties. A curve with no adustment is shown to estimate a median value of both discharge and frequency of occurrence, while an expected probability curve is shown to estimate a mean frequency of flood years. The attributes and constraints of the two types of curves for various uses are discussed. 

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Flood frequency: expected and unexpected probabilities
Series title:
Open-File Report
Series number:
76-775
Year Published:
1976
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Description:
iii, 7 p.
Online Only (Y/N):
N
Additional Online Files (Y/N):
N