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CITY OF. LINO LAS 10/24/94 Water Quality Program describes the status, program use, data requirements, costs, documentation, references, and contact for about 40 models developed by the EPA, the Corps of Engineers, USGS,a nd other supported by the USGS offices. Model Selection and Use Uses of nonpoint source pollution models are so numerous that an array of models from which to select is necessary to select the one best suited to a specific task. Model selection must be based on the objective of the study to which it is being applied and model - specific criteria. The particular use of the model, whether it be for site - specific assessment, project evaluation and planning, policy decisions, or research, must be considered in determining the appropriate model. Several criteria may be helpful in making a model selection. First, what specific objectives are most important in evaluating the problem? What is the modeling to accomplish? Second, what is the space scale of the problem? Third, what time scale is important: single event, weekly monthly, or long term annual averages? Lastly, what data is needed, or what data is available, to use a particular model? The use of the ideal model must have the resources to collect the necessary data and also correctly interpret and apply the results. Understanding the types of models and how models are selected and used is essential for determining what model(s) is appropriate (if any), for a local water management program. Based on the technical complexities of model use, and the fact that quality modeling is relatively new, it is recommended that modeling not be undertaken by the City unless necessary. In many cases, the current monitoring data base generated by outside agencies is adequate to identify general trends in the constituents of a particular waterbody. In areas where problems exist or where effort is required, additional monitoring as well as analysis of existing data may be needed. When a particular problem or objective develops for a lake or wetland, an appropriate model can be selected that will address the problem. Even when the model is selected, the final water quality management program should 411 indude an additional, specific monitoring effort to calibrate the model. Local Water Management Plan SEH No. A- LINOL9402.00 Reference Document Page 48