## 3 Methodology and Database  
The implementation of empirical methodologies based on multiple studies for the arrangement of ravines in GIS spatial analysis models is achieved by managing spatial databases through geoinformation software with spatial analysis equations, which integrate spatial databases to obtain quantifiable results used in decision making regarding the control methods and land management.  
In the present case study, an independent research approach was developed based on techniques and methodology of functional integration of modern procedures of spatial database acquisition (UAV and drainage hydrography) with hydraulic analysis software and simulation and parameters modelling (HEC-RAS v.5.0.7 and ArcGIS v.10.8), necessary for the evaluation of the current state of ravine degradation and the creation of solutions for stabilization and improvement. Within the spatial analysis process, three main stages are clearly highlighted: the acquisition stage of spatial and non-spatial databases, the stage of spatial analysis and simulation and the stage of disseminating the results with decision making. Each stage is conditioned by the phase it precedes and in turn conditions the next phase.  
Regarding the acquisition stage of spatial and non-spatial databases, its structure is present in the form of a submodel of spatial analysis, integrated into the general model resulting from the three main stages. This stage centres around obtaining the digital surface model, respectively, of the digital ravine elevation model, developed based on UAV and geomatics techniques, as well as the identification by calculation of the maximum theoretical simulation flow, which causes the accentuated development of the ravine by lateral and depth erosion.  
The spatial analysis and simulation stage is conditioned by the quality and accuracy of the input databases within the spatial analysis and hydraulic calculation software for simulating the degree of evolution of the ravine. To complete this second stage, the HEC-RAS 5.07 software developed by the US Army Corps of Engineers was used to spatialize the necessary parameters (stream power, max depth, velocity, shear stress, WSE water surface elevation), to analyse stable and critical areas within the analysed ravine as well as for the simulation of the scenarios for different arrangement modes that aim at reducing the erosion within the ravine and, implicitly, its correct arrangement [40; 41].  
The visualization and digital mapping of the analysed parameters, as well as of the potential effects resulting from the arrangement proposal, were analysed and presented using the ArcGIS geoinformation software. As a result of implementing three scenarios for the arrangement and improvement of the analysed ravine, viable solution results with different impact in the territory were obtained. In the third stage, the results were analysed, and the best technical arrangement solution was chosen in terms of cost and efficiency. The presented methodology (Figure 2) highlights the practical side of implementing spatial analysis models based on the use of several software for analysis and management of high-precision and accurate input databases, with the main goal of obtaining the results applicable in specialized practice and issuing viable solutions for spatial planning.