QUAL2K is a river and stream water quality model. It is typically used to assess the environmental impact of multiple pollution discharges along rivers. Pollutants can come from point sources such as industrial wastewater, municipal sewers, and storm water. Pollutants can also come from non-point sources such as agricultural or urban runoff, and commercial activity such as forestry, mining, and construction. It is available as freeware from the United States Agency. Environmental Protection QUAL2K was developed by Steve Chapra, Greg Pelletier and Hua Tao in connection with the Environmental Protection Agency and . The model is written in MS Windows Visual Basic, and Microsoft Excel is used as the graphical user interface. All input and outputs are organized in a series of worksheet tabs. Different color tabs correlate to the various inputs and outputs. All numerical calculations are implemented in Fortran 90 in order to decrease the time of calculation. The program is intended to represent a modernized version of the QUAL2E model developed by Brown and Barnwell in 1987. QUAL2K has been enhanced with two species of CBOD and internal sediment processes. In addition, QUAL2K now models pH and alkalinity. The model uses one-dimensional modeling; the river is assumed to be fully-mixed in the vertical and lateral directions. Steady-state is also assumed by the program; pollutant inputs and predicted water quality parameters cannot evolve over time. The model also assumes a trapezoidal cross section of the channel being modeled. A wide range of chemical and biological pollutants within a river can be modeled, including carbonaceous biochemical oxygen demand (CBOD), nitrogen and phosphorus species, suspended solids, algae, pathogens, phytoplankton and detritus. Physical-chemical processes simulated by the model include water quality kinetics, chemical equilibrium, advection,
QUAL2K is a river and stream water quality model. It is typically used to assess the environmental impact of multiple pollution discharges along rivers. Pollutants can come from point sources such as industrial wastewater, municipal sewers, and storm water. Pollutants can also come from non-point sources such as agricultural or urban runoff, and commercial activity such as forestry, mining, and construction. It is available as freeware from the United States Environmental Protection Agency. QUAL2K was developed by Steve Chapra, Greg Pelletier and Hua Tao in connection with the Environmental Protection Agency and . The model is written in MS Windows Visual Basic, and Microsoft Excel is used as the graphical user interface. All input and outputs are organized in a series of worksheet tabs. Different color tabs correlate to the various inputs and outputs. All numerical calculations are implemented in Fortran 90 in order to decrease the time of calculation. The program is intended to represent a modernized version of the QUAL2E model developed by Brown and Barnwell in 1987. QUAL2K has been enhanced with two species of CBOD and internal sediment processes. In addition, QUAL2K now models pH and alkalinity. The model uses one-dimensional modeling; the river is assumed to be fully-mixed in the vertical and lateral directions. Steady-state is also assumed by the program; pollutant inputs and predicted water quality parameters cannot evolve over time. The model also assumes a trapezoidal cross section of the channel being modeled. A wide range of chemical and biological pollutants within a river can be modeled, including carbonaceous biochemical oxygen demand (CBOD), nitrogen and phosphorus species, suspended solids, algae, pathogens, phytoplankton and detritus. Physical-chemical processes simulated by the model include water quality kinetics, chemical equilibrium, advection,
QUAL2K_intro.docx