Soil erosion ABAG — Extended water network

Large-scale maps on soil erosion hazards due to water and extended water network (outflow-effective depth lines):The extended water network contains drain-effective depth lines that connect to the water network. The exact location, spatial density and distribution pattern of these drainage paths for surface water are of great interest. In case of erosion, soil material is transported here and entered at crossing points in waters or settlement areas.The description of the depth lines takes place from a minimum size of the catchment area of 5 ha. The following points to be considered: In settlement areas, the course of the depth lines must be critically questioned, since the calculation based on the digital terrain model DGM 5 does not take into account information on settlement drainage (e.g. inlet shafts). In areas with large-scale low slope inclinations (e.g. parts of the forepfalz, Landstuhler Bruchs or the Neuwieder Basin), the course of the depth lines is often not plausible. Where artificial drainage trenches exist, the modeling result must also be critically questioned. At road or motorway dams, the lack of information on the location of dam passages can lead to an unrealistic course of the deep lines along the roads.基于水动力与扩展水系的水土流失灾害大型专题制图数据集（汇流有效深度线）：扩展水系包含与主水系相连的排水有效深度线。地表径流排水路径的确切位置、空间密度与分布格局为核心研究关切。当发生水土流失时，土壤物质会被搬运至此，并在与水体或定居区域的交汇点进入其中。 本数据集的深度线提取以汇水区面积不小于5公顷为前提。需注意以下事项：在定居区域，需审慎校验深度线的走向，因基于DGM 5数字地形模型的计算未纳入定居区排水设施（如进水井）的相关信息；在大范围缓坡区域（如前普法尔茨部分区域、兰施图尔沼泽或诺伊维德盆地），深度线的走向往往不符合实际；若存在人工排水渠，同样需审慎校验建模结果；在公路或高速公路路堤区域，由于缺乏路堤通道位置的相关信息，深度线可能会沿道路呈现不符合实际的走向。