Beginning in the early 1970s computer models were developed to analyze the transport of runoff carrying water pollutants, which considered dissolution rates of various chemicals, infiltration into soils and ultimate pollutant load delivered to receiving waters.
Beginning in the early 1970s, models were created to examine the transport of pollutants carried by runoff, which considered the breakdown rates of various chemicals, the absorption of these chemicals into soils, and the final load of pollutants delivered to water bodies.