|WORLD METEOROLOGICAL ORGANIZATION||
|Explanation of the criteria for classification and numbering of components||
|Explanation of the dates on the component's description|
THE CONSOLIDATED FREQUENCY ANALYSIS (CFA) PACKAGE
1. Purpose and objectives
To provide a user-friendly interactive computer package to analyse the
data with respect to the underlying assumptions of flood frequency analysis
and to perform flood frequency analyses using several frequency
The CFA Package allows the user to: easily enter flood data for
analysis; modify data sets so as to add, delete, or modify all stored
information; save modified data sets for future use; perform nonparametric
tests for homogeneity, trend, independence and randomness; graphically
display data in various fashions; perform tests for low and high outliers;
determine T-year events for the straightforward case, samples with historic information, samples with low outliers, samples with zero flow values, and
1) generalized extreme value;
Annual maximum daily or instantaneous discharge and the year and month of its occurrence constitute the data required for analysis.
The censoring threshold and the number of floods where exact
magnitudes are not known but which are known to have occurred and are less
than the threshold can be included so that an historical flood frequency
analysis can be performed. Data and historic information can be entered via
the keyboard or read from mass storage devices.
Results of nonparametric tests for homogeneity, trend, independence
and randomness. Graphical displays of the data are also available as a visual aid in the assessment of the data regarding the assumptions of frequency analysis. Once a sample passes the screening procedure, a frequency analysis may be performed. Summary statistics in real and log (Naperian) formats are given for the flood data. Parameters of selected distributions, tables of design flood estimates, and frequency curves are available.
5. Operational requirements and restrictions
The current version of CFA software was written in Fortran 77 to run under DOS 3.1 on IBM-type microcomputers with a math coprocessor. However it can also be used on computers running Windows 95 and 98.
CFA was designed to be user friendly and interactive, thus no knowledge of programming is required to operate the package. Interpretation
of results should be performed by analysts having knowledge
6. Form of presentation
The user manual and appendices are in English. Diskettes contain an
executable module and a sample data set.
7. Operational experience
CFA has been applied to several hundred hydrometric sites in Canada
and is currently widely used by government agencies and private industry.
In addition, CFA has been distributed to individuals in over 15 countries.
8. Originator and technical support
Atmospheric Environment Service, Environment Canada.
Through the HOMS National Reference Centre for Canada
10. Conditions on use
Licences for CFA must be purchased from Greenland International Consulting Inc. Educational and multiple licence discounts are available.
|(First entered: 24 AUG 90||
Last updated: 25 JUN 2008)