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Flooding risk in urban areas is particularly high, due to the high population density and property values, including those of transport, residential, service and industrial infrastructure, among others. There are many reasons for flooding in urban areas; among them, direct heavy rainfall can cause special problems in risk management. In the case of random heavy rainfall, flood risk management can be supported by information about the morphology of the terrain and the degree of its sealing. In this study, we analyse methods for determining the risk of flooding in urban areas using digital terrain model (DTM) and geographic information system (GIS) tools. Predictors of precipitation floods in urban areas are defined, including the determination of flat areas, areas without outflow (non-drainage) and with large terrain height differences. The main source of information about historical rainfall floods relates to interventions by fire brigades, which constitute the basis for verifying the areas of occurrence of rainfall floods, as determined on the basis of morphological analysis of the area. Identifying the locations of rainfall flooding areas and developing accurate maps based on them are crucial for spatial planning and flood management at the local scale.

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The methodology was elaborated in Poland for developing flood risk management plans. The objective of this methodology is to formulate procedures and basic tools for development of flood risk man agement plans. One of the elements of the methodology is the proposal of multi criteria analysis facilitating selection of the best options limiting flood risk which are presented in the article. It is assumed in the meth odology that work on the options and their selection will be carried out by teams of decision makers in a catchment area, comprising experts and stakeholders participating in the flood risk management process. Discussion of multi criteria analysis is illustrated by an example of its application.

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