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OMB No. 0704-0188

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PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.

1. REPORT DATE (DD-MM-YYYY)
February 2022

2. REPORT TYPE
Computer Program Document

3. DATES COVERED (From - To)

4. TITLE AND SUBTITLE
HEC-WAT Hydrologic Sampler
User Guide
Version 1.1

5a. CONTRACT NUMBER

5b. GRANT NUMBER

5c. PROGRAM ELEMENT NUMBER

6. AUTHOR(S)
Beth Faber, CEIWR-HEC
Julia Slaughter, CEIWR-HEC
Lea Adams, CEIWR-HEC
William Lehman, CEIWR-HEC
Evan Heisman, CEIWR-HEC
Others at CEIWR-HEC

5d. PROJECT NUMBER

5e. TASK NUMBER

5f. WORK UNIT NUMBER

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
US 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-88b

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

13. SUPPLEMENTARY NOTES

14. ABSTRACT
The Hydrologic Sampler is a plug-in built for the HEC-WAT (Watershed Analysis Tool) software (refer to the HEC-WAT User's Manual). The purpose of the Hydrologic Sampler is to allow users to create hydrologic time series data necessary for a Flood Risk Analysis (FRA) compute in HEC-WAT. The FRA compute is a Monte Carlo simulation that evaluates thousands of sampled flood events within a watershed. Each flood event is initiated with a time series dataset of either flow hydrographs or precipitation hyetographs. The hydrologic sampling relies on hydrologic information such as flow or precipitation frequency curves, spatial correlations between curves, and hydrograph or hyetograph shapes, or instead, historical and synthetic event hydrographs. This hydrologic information will be sampled to generate as many realizations of the lifecycle hydrologic sequence as necessary, with each generated sequence available as input boundary conditions to the other software applications in the program sequence, such as HEC-RAS, HEC-HMS or HEC-ResSim.

15. SUBJECT TERMS
HEC-WAT, software, plug-in, interface, integrate, analytical process, tools, USACE, watershed, lifecycle, realization, Monte Carlo, water resources study, study, graphical user interface, GUI, flow sampling, frequency curves, precipitation sampling, correlation, bootstrapping, Hydrologic Sampler, HEC-HMS, HEC-RAS, HEC-ResSim, HEC-FIA, computations, framework, hydrologic, hydraulic, sampling, modeling, results, models, reporting, visualization, data, sharing, statistical analysis, measures, alternatives, simulations, analysis periods, events, schematic, map windows, program order, common computation points, stream alignment, model linking, panes, panels, tabs, toolbars

16. SECURITY CLASSIFICATION OF:

17. LIMITATION OF ABSTRACT
UU

18. NUMBER OF PAGES

19a. NAME OF RESPONSIBLE PERSON

a. REPORT
U

b. ABSTRACT
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c. THIS PAGE
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19b. TELEPHONE NUMBER (Include area code)