The flow path maps are based on an elevation model with a 1 m² grid or 5 m² grid. They are based on the current digital terrain models (DTM). The calculation of the flow paths is based on watercourses. The official hydrological area register of the Hessian State Agency for Nature Conservation, Environment and Geology (HLNUG) was selected as the boundaries of the catchment areas. However, these boundaries are based on an older elevation model. In some cases, the watersheds resulting from the elevation model of the flow path maps and the catchment area boundaries from the hydrological survey differ. At these points (border areas), it can happen that flow paths begin in the map and then leave the map. For cost reasons, the catchment areas resulting from the elevation model were not adjusted during the creation of the flow path maps.

At the municipal boundaries of the state capital Wiesbaden, the catchment area boundary of a watercourse is not identical to the city boundary. If the catchment area belongs to a watercourse in a neighboring district, it may happen in a few places that no calculations of the flow path map are available for these areas (and thus for a part of Wiesbaden).

Flow path maps are based on an elevation model of 1 m² or 5 m². This is based on the current digital terrain models (DTM). A DTK 25 (Digital Topographic Map 1:25,000) was selected as the map basis for the presentation of the results. The contour lines shown on the background map (DTK 25) are based on a different elevation model. In some cases, therefore, the representation may appear inconsistent.

DTK 25 (Digital Topographic Map 1:25,000) was selected as the background map for the depiction of the flow paths. The colored buildings are taken from ATKIS (Amtliches Topographisch-Kartographisches Informationssystem). If no colored buildings are included in individual sub-areas, this is because these buildings do not exist in the ATKIS data.

The buildings are colored differently depending on their distance from the flow path: red (5 m), orange (10 m), yellow (15 m) and white (outside the hazard area). In some cases, it appears that buildings running parallel to each other along a flow path are colored differently, even though they are visually the same distance apart. For the coloring, the shortest distance perpendicular to the flow path to the marked building (part) was automatically determined. However, the small scale shown may give the impression that the buildings are at the same distance from the flow path.

Agricultural land is marked as "at very high risk" (red), particularly on some steeper slopes. However, the buildings located below in the direction of the slope, some of which are adjacent, are shown as "outside the hazard area" (white). The buildings were only colored starting from the flow path; potential hazards due to agricultural use and slope inclination above the buildings were not evaluated in the map. A potential hazard must always be checked on site.