It is thus imperative to choose a suitable model with a simple structure, minimum input data requirements, and a reasonable precision. Measurement of all parameters affecting catchmentrunoff is impossible, especially for remote catchments. The type of the modelling approach normally depends on the purposes, data availability, and ease of use. Different techniques of the hydrologic modelling approach have been so far adopted in different studies, with some of them focused on an empiricalbasis and other modelling approaches based on the distributed modelling concept. The rainfall-runoff modelling approach is most frequently used in hydrology for estimating the runoff signal which leaves the catchment from the rainfall signal received by the basin. The tasks in relation to estimation runoff volumes and flood peaks can be, however, easily simplified by adopting a modelling concept understanding rainfall partitioning and the principal factors triggering runoff.
An actual estimation of runoff volume and peaks is also important for planning different interventions in integrated watershed management and many flood protectionprojects. An adequate knowledge of runoff within a given catchment is important for the planning and designing of many water resources development and related projects.
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