Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 8, 523-532, 2008
https://doi.org/10.5194/nhess-8-523-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
27 May 2008
Are floods in part a form of land use externality?
W. Dorner1, M. Porter2, and R. Metzka1 1Water and Environment, University of Applied Sciences Deggendorf, Germany
2Australian Centre for the Sustainable Catchments, University of Southern Queensland, Australia
Abstract. Peak and volume of river flows are functions of the catchment surface characteristics. This means that any impacts to the run-off regime (for example surface sealing and river training) could affect people and land users in the lower system. The costs of flood defence or compensation of damages are usually not included in the economic calculation of the upstream land owner or land user. In economic terms these effects are referred to as unidirectional externalities. This paper presents a methodology to identify externalities related to land use and run-off and describes the relevant cause-effect relations and how they can be modelled. The Herzogbach is a small tributary of the Danube River in Lower Bavaria. It is located in a rural area, dominated by intensive farming practices. A combination of hydrological and hydraulic modelling provided the core of the project methodology to allow the interpretation of economic data. Comparisons of damage estimates resulting from different hydrological scenarios based on different land uses, and flood mitigation costs were used to show the economic significance of human impacts.

Citation: Dorner, W., Porter, M., and Metzka, R.: Are floods in part a form of land use externality?, Nat. Hazards Earth Syst. Sci., 8, 523-532, https://doi.org/10.5194/nhess-8-523-2008, 2008.
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