WASP7 Course Watershed & Water Quality Modeling Technical Support Center Watershed & Water Quality Modeling Technical Support Center Dissolved Oxygen Dissolved Oxygen Processes Processes Processes and Equations Processes and Equations Implemented in WASP7 Implemented in WASP7 Eutrophication Module Eutrophication Module
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Watershed & Water Quality Modeling Technical Support Center WASP7 Course Dissolved Oxygen Processes Processes and Equations Implemented in WASP7 Eutrophication.
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WASP7 Course
Watershed & Water Quality Modeling Technical Support CenterWatershed & Water Quality Modeling Technical Support Center
Watershed & Water Quality Modeling Technical Support CenterWatershed & Water Quality Modeling Technical Support Center
WASP7 Course
Sources & SinksSources & Sinks
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WASP7 Course
BOD in WASPBOD in WASP
• Best to convert BOD to Ultimate BOD Best to convert BOD to Ultimate BOD ValuesValues
• Three BOD ClassesThree BOD Classes– Fast, Medium, Slow (Labile to Refractory)– Biotic (Algae/Benthic Algae), Abiotic, WWTP– Varying Decay, F Ratios based on Sources
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Watershed & Water Quality Modeling Technical Support CenterWatershed & Water Quality Modeling Technical Support Center
WASP7 Course
Reaeration CoefficientsReaeration Coefficients
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WASP7 Course
Dam ReaerationDam Reaeration
Where:r = ratio of deficit above and below the damH = difference in water elevation (meters)T = water temperature (°C)a = water quality coefficientb = dam-type coefficient
(Chapra, 1997)
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Air Temperature Air Temperature °C (Time Function)°C (Time Function)
Water Temperature Water Temperature °C (Segment Parameter and/or Time Function)°C (Segment Parameter and/or Time Function)Simulated by Hydrodynamic ModelSimulated by Hydrodynamic Model
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WASP7 Course
Temperature DependencyTemperature Dependency
20 ( 20)T
TTK K
Where:Where:
KKTT The value of variable at the local temperature, T (The value of variable at the local temperature, T (°C)°C)
The value of the variable at 20 The value of the variable at 20 °C°C
ӨӨThe empirical constant for each temperature dependent system The empirical constant for each temperature dependent system variable, user specifiedvariable, user specified
20TK
Watershed & Water Quality Modeling Technical Support CenterWatershed & Water Quality Modeling Technical Support Center