# Flash Floods Hazard to the Settlement Network versus Land Use Planning (Lublin Upland, East Poland)
## 3 Methods  
### Data Sources  
This study used publicly available data, published on the Geoportal of Spatial Information Infrastructure (in Poland) and managed by the Central Office of Geodesy and Cartography [54]. The elevation data (DTM--digital terrain model) made available there were acquired as part of the ISOK (National Guard Information System) project. DTM is a product created from processing LIDaR survey data and is made available as a collection of raster tiles with a resolution of 1 \(\times\) 1 m [55]. An essential operation that had to be performed before proceeding with analysis was the removal of any drainless depressions so that the DTM was hydrologically correct (Figure 2). A number of derived layers were generated from the DTM, which were then used to delineate catchment boundaries and develop their morphometric characteristics.  
The second dataset used in the study was the National Database of Topographic Objects 10k (BDOT10k), developed at an accuracy equivalent to a scale of 1:10,000 [56; 57]. BDOT10k contains information on water and communications networks, land development, land cover and land use, buildings, protected areas, and territorial division units. These collections are available on websites of provinces and are constantly updated by local government authorities (data used present the current state of topographic elements).  
The third element was vector data created from the transformation of the Local Spatial Development Plan (MPZP) of Krasnobrod municipality into digital form. For the other highly susceptible municipalities, local spatial development plans available online in the form of raster files were used. For each commune in Poland, where such a plan is elaborated, it is available on a separate website. In our case, the websites of studied municipalities are listed in the Supplementary File S1.  
A land cover map, a road map, and a buildings layer were generated from the 10k Database of Topographic Objects (BDOT10k). We decided to use level 2 of the database because it contained an appropriate level of detail (15 categories) (Figure 2).  
\begin{table}
\begin{tabular}{l c c c c c c c c c c} \hline \hline
**Indicator** & **Drierzkowicz** & **Glusk** & **Kzasnobrod** & **Poniatowa** & **Szczebrezeszyn** & **Trzydnik** & **Urzydów** & **Wolka** & **Zakrzew** & **Zamosc** \\ \hline Area of municipality (km\({}^{2}\)) & 87 & 64 & 127 & 85 & 123 & 104 & 119 & 73 & 75 & 196 \\ Population density (residents/km\({}^{2}\)) & 59.8 & 225.2 & 53.2 & 157.2 & 86 & 57.9 & 69.3 & 195.6 & 35.4 & 121.2 \\ Number of localities (of which cities) & 15 & 18 & 17 (1) & 18 (1) & 15 (1) & 22 & 30 (1) & 16 & 18 & 35 \\ Forests (\%) & 24.6 & 7.8 & 53.8 & 17.8 & 23.1 & 7.4 & 16.4 & 11.7 & 13.2 & 9.2 \\ Agricultural lands (\%) & 51.4 & 66.5 & 30.6 & 67.6 & 48.8 & 84.2 & 70.4 & 48.9 & 64.6 & 72.1 \\ Developed lands (ha) & 149 & 327 & 466 & 334 & 826 & 236 & 31.8 & 321 & 140 & 1159 \\ Developed lands (\%) & 1.7 & 5.1 & 3.7 & 4.0 & 6.7 & 2.3 & 2.7 & 4.4 & 1.9 & 5.9 \\  & Limestones, sandstones & & Limestones, sands & Limestones, sands & Limestones, sands & Opokas, & & & & \\ Land relief & Diversified & Flat plain & Diversified & Flat depression & Diversified & Diversified & Diversified & Diversified & Plateau & Depression \\ \hline \hline \end{tabular}
\end{table}
Table 1: Selected characteristics of surveyed municipalities after Local Data Bank [50; 53].