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

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

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

WASP Structure WASP Transport Bookkeeping EUTRO or TOXI = + Kinetics

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

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

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

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

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

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

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

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

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

Simple Flow Through River 1 2 3 4 5 6

Hydrodynamic Linkage Complex Systems Stormwater Modeling Estuaries Stratified System Stormwater Modeling

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

Little River Embayment, Lake Allatoona, GA

Little River Embayment, Lake Allatoona, GA

Flint Creek

Eutrophication Model

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

Organic Chemical Model Overview

Mercury Model Overview

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

Flint Creek Example

Flint Cr (AL)