There are a number of hydrologic forecast models in operational use in the world, several of which are in Canada. No one model is suitable for all drainage systems. The models have varying levels of complexity, which are reflected in their requirements for different types and amounts of data. Research is being carried out to test the suitability of many of the models and to determine the appropriate ones for various drainage systems. The model used by a forecasting unit is dependent upon the data available, hydrologic expertise, available funding, and on the type of watersheds and the specific nature of the problem.
Many centres run several models either in parallel or in series.
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