1. Water Quality Analysis Simulation Program (WASP)
Tim Wool
US EPA - Region 4

2. WASP Overview
History
In the Beginning
In the Middle
And Now……

3. What is WASP? Water Quality Model Conventional Pollutants
Organic Chemicals
Mercury

4. WASP Structure
WASP
Transport
Bookkeeping
EUTRO or
TOXI = +
Kinetics

5. Basic WASP System Model DLL’s EUTRO.DLL -- Eutrophication Model
TOXI.DLL -- Organic Chemical Model
MERCURY.DLL – Specialized version of TOXI to handle Mercury

6. WASP Modeling Framework
Model Preprocessor/Data Server
Model Input File (Binary)
WASP
Input
Messages
Models
Hydrodynamic
Interface
Binary Model Output
Stored
Data
BMD
EUTRO
Hydro
TOXI
Exported Model Results
Mercury
MOVEM
Graphical Post Processor

7. Generalized Model Framework
Box Model
1, 2, or 3 Dimensions

8. WASP Linkages WASP Loading Models SWMM HSPF LSPC NPSM PRZM
Bioaccumulation
FGETS
FCM-2
WASP
Hydrodynamic
Models
EFDC
DYNHYD
RIVMOD
EPD-RIV1
SWMM
External
Spreadsheets
ASCII Files
Windows
Clipboard

9. WASP is a Variable Complexity Modeling System
When building a water body model, adjust complexity to match the problem.
More Complex Aquatic Systems
More Complex Chemical or Interaction
More Complex Management Questions

10. Components of a Complex Water Body Modeling Framework
Watershed loading models
Hydrodynamic and transport models
Contaminant fate models
Food web bioaccumulation models

11. Processes that Control Complexity
Network Spatial Variability
Time Variability
Transport Patterns
Loading Patterns
Chemical Interactions

12. WASP Transport Scheme Six Different Flow Fields Surface Water
Porewater
3 Solids Transport Fields
Evaporation/Precipitation

13. WASP Transport Scheme Flows in WASP can be
Specified in the input dataset
Read from a hydrodynamic interface file created by another model or program

14. Simple Flow Through River1 2 3 4 5 6

15. Hydrodynamic Linkage Complex Systems Stormwater Modeling Estuaries
Stratified System
Stormwater Modeling

16. Hydrodynamic Prediction of ….. Travel Time Water Depth Water Velocity
Temperature
Salinity

17. Little River Embayment, Lake Allatoona, GA

18. Little River Embayment, Lake Allatoona, GA

20. Flint Creek

21. Eutrophication Model

22. Processes Considered Phytoplankton Kinetics Periphyton Kinetics
Phosphorus Cycling
Nitrogen Cycling
Dissolved Oxygen Balance
Sediment Diagenesis

24. Organic Chemical Model
Overview

26. Mercury Model
Overview

27. Mercury Model Volatilization Watershed Load NPDES Burial Demethylation
State Variables
Hg(0) Silt
Hg(II) Sand
MeHg
Methylation
Demethylation
Oxidation
Reduction
Burial
NPDES
DOC

28. Flint Creek Example

29. Flint Cr (AL)