"The most widely used types are mathematical models, which use logical relationships, rules, variables, equations, parameters and algorithms (i.e., sets of linked equations). These describe systems, made up of various parts and connections, rather than self-contained entities. Pollution of an area of land by chemicals carried by groundwater, with pollutant and water quantities as inputs, soil properties as parameters, pollutant concentrations at various locations as outputs and a mathematical description of groundwater flows as the model. (Calculations will proceed for various time steps, say, at daily intervals, and, therefore, there will be sets of input variables, rather than single values.) A cash flow analysis with receipts and payments as inputs, discount rates as a parameter, net present value as an output and compound interest equations as the model. The effects of development and environmental degradation on land values, with development and pollution levels as inputs, indices of social reactions as parameters and land values as outputs and relationships involving benefits of development, disadvantages of pollution, public perceptions and land values as the main model. Source: http://in.docsity.com/en-docs/Environmental_Management_Techniques_-_Environment_Management_-_Study_Notes_"
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