Agriculture and Flooding Agriculture and Floods Subproject of the Flood Risk II Project of the Austrian Ministry for Agriculture, Forestry, Environment.

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Agriculture and Flooding Agriculture and Floods Subproject of the Flood Risk II Project of the Austrian Ministry for Agriculture, Forestry, Environment and Water Management November 2008 Bundesanstalt für Agrarwirtschaft Federal Institute of Agricultural Economics Marxergasse 2, 1030 Vienna Klaus Wagner, Hubert Janetschek, Julia Neuwirth GIS-Model and Area Classification A natural contribution of agricultural lands to flood prevention exists due to the lands’ natural spatial conditions: soil characteristics, climatic conditions and topology determine the extent of surface water run-off, while the latter is influenced similarly by management (type of crop, type of cultivation, work processes). GIS overlays of the available water capacity and of the erosion risk associated with the agricultural land use permit the classification of lands according to their contribution to flood prevention (fig. 2). A high flood prevention contribution exists when, for example, a level land surface with water-retentive soil and favourable precipitation is used as grassland. At the same time, crop lands generally exhibit higher surface water run-off values, and the risk of a high surface water run-off is higher for certain types of row crops in particular: e.g., crops for which the soil remains uncovered for long periods, but also for crops with a late harvest, for which the intermediate green covering of fields becomes more difficult. The evaluation of flood sensitivity takes equally into account the flood frequency to identify those areas that are especially at risk (fig. 3). In particular these areas should be adapted in their use to keep potential damage in the case of floods low. Figure 2: Flood prevention contribution of agricultural lands related to fields and to water catchment areas of Seitenstetten Figure 3: Flood sensitivity of agricultural lands related to fields and to water catchment areas of Seitenstetten River Community borderline Water catchment area low middle high Wood or settlement area Seitenstetten Water Catchment Areas Flood Prevention Seitenstetten Water Catchment Areas Flood Prevention River Community borderline Water catchment area low low - middle middle middle –high high River Community borderline Water catchment area low middle high Wood or settlement area Seitenstetten Water Catchment Areas Flood Sensitivity Seitenstetten Water Catchment Areas Flood Sensitivity River Community borderline Water catchment area low low - middle middle middle –high high Figure 1: Schematic approach Project Outline On the one hand, agriculture contributes to the emergence of floods by way of the land cultivation and management practices in use. On the other hand, agricultural lands also serve as water retention areas, resulting in damages commensurate with the extent of flooding. In recent years, an increase in extreme weather incidents and the associated magnitude of damages have generated an ongoing discussion in Austria regarding adapted forms of land use and compensation payments. Since suitable spatial-planning basics for agricultural lands are not available thus far, one part of the “Spatial Planning” work package of the project “Flood Risk II” deals with the interactions between agriculture and flooding. Building on a functional evaluation system for agricultural lands as developed within the Interreg project “ILUP”, the subproject “Agriculture and Flooding” has as its goal to classify the flood-protection contribution and flood sensitivity of agricultural lands. This, in turn, enables the recommendation of targeted measures for potentially improving flood situations, as well as an estimate of their implementation costs (fig. 1). In addition to the digital soil map, other fundamental sources used for the project are the digital flood risk map, the Integrated Administration and Control System and data about erosion risks and available water capacity. Reference values and marginal returns sourced from the Federal Institute of Agricultural Economics also flow into the cost estimates for the recommended combination of measures. Measures and Costs of Flood Prevention on Agricultural Areas The specific literature, as well as research and evaluation reports on agri-environmental measures, suggest that there are measures available for improving both soil and water retention on agricultural lands (see table 1). Depending on such factors as crop yields, producer prices, the business situations and work processes used, farmers may experience various financial disadvantages from flood-prevention related changes in land use. However, changes in cultivation must not always be accompanied by higher costs and, in fact, may instead lead to lowered costs, e.g., changing from autumn ploughing without a green cover to direct seeding in temporary winter green cover (see table 2). Within the sample community of Seitenstetten, water catchment areas exhibiting either a low contribution to flood prevention or high flood sensitivity were identified as relevant areas for the application of measures. The GIS generated land use balances permit ascertaining on how much land within the catchment areas, and also on which land specifically, changes in use would seem advisable. The measures to be set are in accordance with the evaluation of individual lands. Thus, for example, areas exhibiting high flood sensitivity shall have stronger measures applied than those with only a medium sensitivity. Source: Own calculation Table 1: Effects of selected measures of the Austrian Agri-Environmental programme on soil and water retention and their annual costs Source: Own calculation In sum, the resulting changes for Seitenstetten would be a conversion from silage corn to grassland on 110 ha, a conversion from grain corn to feed grain with temporary cover crops on 22 ha and intermediate cover crops on 44 ha of arable fields. The costs for converting to the aforementioned types of cultivation amount to an approximate total of € 44,000 annually. The basic results developed within the sub-project “Agriculture and Flooding” will flow into the overall project “Flood Risk II,” while furthermore contributing to an understanding of the multifunctionality of agricultural lands. Table 2: Additional economic costs for changes in the use of agricultural land to improve flood situation