TMDL Modeling Toolbox Water Quality Analysis Simulation Program

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

TMDL Modeling Toolbox -- WASP Overview • History – In the Beginning – In the Middle – And Now……

TMDL Modeling Toolbox -- WASP What is WASP? • Water Quality Model – Conventional Pollutants – Organic Chemicals – Mercury

TMDL Modeling Toolbox -- WASP Structure WASP Transport Bookkeeping = EUTRO or TOXI + Kinetics

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

TMDL Modeling Toolbox -- WASP Modeling Framework Model Input File (Binary) Model Preprocessor/Data Server WASP Input M es sa g Hydrodynamic Interface Models es Binary Model Output Stored Data EUTRO Hydro ts BMD or te MOVEM Graphical Post Processor Ex p Mercury d M od el Re s ul TOXI

TMDL Modeling Toolbox -- WASP • Generalized Model Framework – Box Model – 1, 2, or 3 Dimensions

TMDL Modeling Toolbox -- WASP Linkages Loading Models SWMM HSPF LSPC NPSM PRZM Bioaccumulation FGETS FCM-2 WASP Hydrodynamic Models EFDC DYNHYD RIVMOD EPD-RIV 1 SWMM External Spreadsheets ASCII Files Windows Clipboard

TMDL Modeling Toolbox -- 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

TMDL Modeling Toolbox -- WASP Components of a Complex Water Body Modeling Framework • • Watershed loading models Hydrodynamic and transport models Contaminant fate models Food web bioaccumulation models

TMDL Modeling Toolbox -- WASP Processes that Control Complexity • • • Network Spatial Variability Time Variability Transport Patterns Loading Patterns Chemical Interactions

TMDL Modeling Toolbox -- WASP Transport Scheme • Six Different Flow Fields – Surface Water – Porewater – 3 Solids Transport Fields – Evaporation/Precipitation

TMDL Modeling Toolbox -- 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

TMDL Modeling Toolbox -- WASP Simple Flow Through River 0 1 2 3 4 5 6 0

TMDL Modeling Toolbox -- WASP Hydrodynamic Linkage • Complex Systems – Estuaries – Stratified System • Stormwater Modeling

TMDL Modeling Toolbox -- WASP Hydrodynamic • Prediction of …. . – Travel Time – Water Depth – Water Velocity – Temperature – Salinity

TMDL Modeling Toolbox -- WASP Little River Embayment, Lake Allatoona, GA

TMDL Modeling Toolbox -- WASP

TMDL Modeling Toolbox -- WASP Flint Creek

TMDL Modeling Toolbox Eutrophication Model

TMDL Modeling Toolbox -- WASP Processes Considered • • • Phytoplankton Kinetics Periphyton Kinetics Phosphorus Cycling Nitrogen Cycling Dissolved Oxygen Balance Sediment Diagenesis

TMDL Modeling Toolbox -- WASP

TMDL Modeling Toolbox Organic Chemical Model Overview

TMDL Modeling Toolbox -- WASP

TMDL Modeling Toolbox Mercury Model Overview

TMDL Modeling Toolbox -- WASP Mercury Model NPDES Watershed Load Demethylation Methylation Burial State Variables Hg(0) Silt Hg(II) Sand Me. Hg Volatilization Oxidation DOC Reduction

TMDL Modeling Toolbox Flint Creek Example

TMDL Modeling Toolbox -- WASP Flint Cr (AL)

TMDL Modeling Toolbox -- WASP