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REPORT DOCUMENTATION PAGE

Form Approved OMB No. 0704-0188

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PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ORGANIZATION.

1.  REPORT DATE (DD-MM-YYYY)

June 9, 2021

2.  REPORT TYPE

Computer Program Document

3.  DATES COVERED (From - To)

4.  TITLE AND SUBTITLE

Hydrologic Modeling System HEC-HMS

User's Manual

5a.  CONTRACT NUMBER

5b.  GRANT NUMBER

5c.  PROGRAM ELEMENT NUMBER

6.  AUTHOR(S)

Mike Bartles, Tom Brauer, David Ho, Matt Fleming, Greg Karlovits, Jay Pak, Nick Van, and Josh Willis

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-74A

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 Modeling System (HEC-HMS) is designed to simulate the complete hydrologic processes of dendritic watershed systems.  In includes many traditional hydrologic analysis procedures such as event infiltration, unit hydrographs, and hydrologic routing.  It also includes procedures necessary for continuous simulation including evapo-transpiration, snowmelt, and soil moisture accounting.  Gridded runoff simulation can also be performed.  Supplemental analysis tools are provided for parameter estimation, depth-area analysis, flow forecasting, uncertainty assessment, and erosion and sediment transport.

The program features an integrated work environment with data entry utilities, computation engine, and results reporting tools.  A graphical user interface allows seamless movement between the different parts of the program.  Simulation results are stored in the Data Storage System HEC-DSS and can be used in conjunction with other software for studies of water availability, urban drainage, flow forecasting, future urbanization impact, reservoir spillway design, flood damage reduction, floodplain regulation, and systems operation.

15.  SUBJECT TERMS

Hydrology, watershed, precipitation runoff, river routing, flood frequency, flood control, water supply, computer simulation, environmental restoration.