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REPORT DOCUMENTATION PAGE

Form Approved OMB No. 0704-0188

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information.  Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to the Department of Defense, Executive Services and Communications Directorate (0704-0188).  Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ORGANIZATION.

1.  REPORT DATE (DD-MM-YYYY)

March 6, 2023

2.  REPORT TYPE

Computer Program Document

3.  DATES COVERED (From - To)

4.  TITLE AND SUBTITLE

HEC-SSP

Statistical Software Package User's Manual

Version 2.3

5a.  CONTRACT NUMBER

5b.  GRANT NUMBER

5c.  PROGRAM ELEMENT NUMBER

6.  AUTHOR(S)

Mike Bartles, Beth Faber, Matt Fleming, Greg Karlovits, Julia Slaughter, and Tricia North

5d.  PROJECT NUMBER

5e.  TASK NUMBER

5F.  WORK UNIT NUMBER

7.  PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)

• U.S. Army Corps of Engineers
• Institute for Water Resources
• Hydrologic Engineering Center (CEIWR-HEC)
• 609 Second Street
• Davis, CA  95616-4687

8.  PERFORMING ORGANIZATION REPORT NUMBER

CPD-86

9.  SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)

10.  SPONSOR/ MONITOR'S ACRONYM(S)

11.  SPONSOR/ MONITOR'S REPORT NUMBER(S)

12.  DISTRIBUTION / AVAILABILITY STATEMENT

Approved for public release; distribution is unlimited.

13.  SUPPLEMENTARY NOTES

14.  ABSTRACT

The Hydrologic Engineering Center's Statistical Software Package (HEC-SSP) allows the user to perform statistical analyses of hydrologic data.  The current version of HEC-SSP can perform peak flood flow frequency analysis using Bulletin 17B and 17C procedures, a general frequency analysis using any type of hydrologic data, a volume frequency analysis, a duration analysis, a coincident frequency analysis, a curve combination analysis, a balanced hydrograph analysis, a distribution fitting analysis, a mixed population analysis, a correlation analysis, and a record extension analysis.  Data storage and management is handled either through the use of text files (ASCII, XML) or the Hydrologic Engineering Center's Data Storage System (HEC-DSS).

15.  SUBJECT TERMS

HEC-SSP, flood frequency, statistics, Bulletin 17B, Bulletin 17C, Expected Moments Algorithm, Maintenance of Variance Extension, flow, stage, computer program, hydrologic data, volume-duration, statistical analysis, balanced hydrograph, distribution fitting, mixed population, data storage, reporting tools, frequency curves, confidence limits, low outliers, high outliers, potentially influential low flows, regional skews, record extension