QUAL2K is a Microsoft Windows based application for river and stream water quality modeling. QUAL2K is an updated version of QUAL2E with improvements in model segmentation, forms of carbonaceous BOD evaluated, particulate organic matter simulation, anoxia and denitrification modeling, sediment-water dissolved oxygen and nutrient fluxes, explicit simulation of attached bottom algae, light extinction calculation, enhanced pH simulation, and pathogen removal functions. The ecologically-focused model simulates daily water quality, as either steady-state or dynamic system. Includes estimation of biological oxygen demand, nitrogen, phosphorus, coliforms and pH.
Website: http://www.qual2k.com