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2. REPORT TYPE
Computer Program Document

3. DATES COVERED (From - To)

4. TITLE AND SUBTITLE
HEC-ResSim Water Quality User's Manual Draft

5a. CONTRACT NUMBER

5b. GRANT NUMBER

5c. PROGRAM ELEMENT NUMBER

6. AUTHOR(S)
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 (HEC)
609 Second Street
Davis, CA 95616-4687

8. PERFORMING ORGANIZATION REPORT NUMBER
CPD-82b

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

Welcome to the U.S. Army Corps of Engineers Reservoir System Simulation (HEC-ResSim) software, Version 4.0, developed by the Hydrologic Engineering Center (HEC) and the U.S. Army Engineer Research and Development Center's Environmental Laboratory (ERDC-EL) in collaboration with Resource Management Associates (RMA), Portland State University (PSU), and the USACE Northwest Division (NWD). This manual provides an overview of the new HEC-ResSim water quality modeling capabilities and serves as a supplement to the HEC-ResSim User's Manual. For general information about the HEC-ResSim software, users are encouraged to refer to the HEC-ResSim Version 4.0 User's Manual.

The HEC-ResSim water quality Graphical User Interface (GUI) offers several key features that enable users to perform water quality analysis within the system: (1) defining meteorological stations and their data, (2) selecting modeled constituents from available water quality libraries, (3) defining appropriate methods and values for water quality parameters, (4) defining the water quality domain and geometry, (5) specifying initial and boundary conditions, (6) Incorporating observed water quality data for model calibration and validation, and (7) visualizing and analyzing water quality model outputs. This suite of capabilities provides comprehensive tools for modeling and managing water quality within HEC-ResSim.

15. SUBJECT TERMS
water quality, meteorological data, geometry, water quality constituents and parameters, dispersion coefficients, mass injections, advection-diffusion-reaction, transformations, reservoirs, watershed schematic, modules, network configuration, software, interface,  USACE, graphical user interface, GUI, modeling, results, reporting, visualization, data, reservoir system analysis, alternatives, simulations, analysis periods, map layers, common computation points, diversions, stream alignment, impact areas, DSS, tabs, toolbars

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