Watershed & Water Quality Modeling Technical Support Center WASP7 Course Dissolved Oxygen Processes Processes and Equations Implemented in WASP7 Eutrophication Module

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Eutrophication - DO Interactions

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Reaereation CBOD 1 CBOD 2 CBOD 3 PhytoplanktonPhytoplanktonPeriphytonPeriphyton DissolvedOxygenDissolvedOxygen SedimentOxygenDemandSedimentOxygenDemand DetritusDetritusDeathDissolution Photosynthesis and Respiration Organic Decay DO Balance Processes

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Streeter-Phelps with SOD DODO BOD 1 CO 2 Reaeration Settling and Deposition of Organic Matter Sediment Oxygen Demand CarbonaceousDeoxygenation Sediment

Watershed & Water Quality Modeling Technical Support Center WASP7 Course DetritusDetritus CBOD1 CBOD2 CBOD3 Boundaries & Loads Phytoplankton Death * Carbon Content Periphyton Death * Carbon Content Fraction * Detritus Dissolution SourcesSinks User Specifies Model Calculated Dissolution = Dissolution Rate * Theta ** Temp – 20 °

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Sources & Sinks

Watershed & Water Quality Modeling Technical Support Center WASP7 Course BOD in WASP Best to convert BOD to Ultimate BOD ValuesBest to convert BOD to Ultimate BOD Values Three BOD ClassesThree BOD Classes –Fast, Medium, Slow (Labile to Refractory) –Biotic (Algae/Benthic Algae), Abiotic, WWTP –Varying Decay, F Ratios based on Sources

Watershed & Water Quality Modeling Technical Support Center WASP7 Course BOD1BOD1 BOD2BOD2 BOD3BOD3Phytoplankton Death * Carbon Content Periphyton Boundaries & Loads DODO BOD Decay * Theta **T-20 BOD Decay * Theta ** T-20

Watershed & Water Quality Modeling Technical Support Center WASP7 Course CBOD

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Model Parameters for BOD

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Sediment Oxygen Demand

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Simulated SOD

Watershed & Water Quality Modeling Technical Support Center WASP7 CourseReaeration

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Reaeration Options Global ReaerationGlobal Reaeration Segment Specific ReaerationSegment Specific Reaeration User DefinedUser Defined –User Selections Covar’s MethodCovar’s Method Dam ReaerationDam Reaeration This options sets the rate for the whole networkUser Specifies which EquationSetting to Zero WASP Selects This Sets Rate for Segment Specify Dam Characteristics

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Reaeration Options Rivers & StreamsRivers & Streams –O’Connor-Dobbins –Churchill –Owens U (mps) H (m) Ka (per day)

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Reaeration Coefficients

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Dam Reaeration Where: r = ratio of deficit above and below the dam H = difference in water elevation (meters) T = water temperature (°C) a = water quality coefficient b = dam-type coefficient (Chapra, 1997)

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Dam Reaeration Polluted State A Gross0.65 Moderate1.0 Slight1.6 Clean1.8 Water Quality Coefficient Dam Type b Flat broad-crested regular step 0.70 Flat broad-crested irregular step 0.80 Flat broad-crested vertical face 0.60 Flat broad-crested straight-slope face 0.75 Flat broad-crested curved face 0.45 Round broad-crested curved face 0.75 Sharp-crested straight slope face 1.00 Sharp crested vertical face 0.80 Sluice gates 0.05 Dam Type Coefficients

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Wind Driven Reaeration 10 Meters Above Water Surface Wind Speed m/sec (Time Function) Air Temperature °C (Time Function) Water Temperature °C (Segment Parameter and/or Time Function) Simulated by Hydrodynamic Model Jour. of Env Eng, Vol. 109, NO.3, PP , June 1983, Author: D.J. O'Connor, TITLE: "Wind Effects on Gas- Liquid Transfer Coefficients" KA Wind

Watershed & Water Quality Modeling Technical Support Center WASP7 Course

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Modified Streeter-Phelps DODO CBOD 1 CO 2 Reaeration Settling Sediment Oxygen Demand CarbonaceousDeoxygenation Sediment NBOD 2 NO 3 NitrogenousDeoxygenation Settling 1 use BOD1; 2 use BOD2

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Nitrogenous BOD

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Modified Streeter-Phelps Input

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Temperature Dependency Where: KTKTKTKT The value of variable at the local temperature, T (°C) The value of the variable at 20 °C Ө The empirical constant for each temperature dependent system variable, user specified

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Linear DO Balance DODO BOD 1 CO 2 Reaeration Settling Sediment Oxygen Demand CarbonaceousDeoxygenation NH 3 Settling NO 3 Org-NOrg-N Phyto PhotosynthesisRespiration Nitrification Mineralization

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Linear DO Balance Input

Watershed & Water Quality Modeling Technical Support Center WASP7 Course Measuring Photosynthesis & Respiration