## 1 Introduction
### The Purpose of the Present Study  
The purpose of this paper is to develop a complete workflow, which includes all the stages to accomplish a simulation in the case of the increase in the water flow of the Somesul Mic River. To achieve the final goal, namely, the simulation of the process of increasing the water flow, the following steps were necessary:  
* Creation of the topographic map for the studied area using the UAV technique.
* Data processing developed following drone flight.
* Preparation of documentation.
* Creating a simulation to present possible disasters.  
To achieve the final goal, it was necessary to consider all logistical, physical, and material elements, starting from the journey to the place where the follow-up study was to be conducted, the necessary equipment for its realization, and the specialized topographic equipment to the calculation of the necessary financial resources.  
The inundability study has as its main purpose prevention against the dangers to which residents living in buildings in areas with high vulnerability from the point of view of placement may be exposed. It is our duty, as geodetic engineers, to support the institutions responsible for the safety and proper functioning of things. The purpose of the work is to fulfill a civic needs that our society needs.  
The need for this research topic lies on the fact that previous works in the field have, in most cases, separated the aspect of taking geospatial data from the field from the aspect of processing these data with the help of GIS software and flood simulation software (for example, HEC-RAS 6.4.1.). Thus, in the case of this paper, a complete working model is proposed that covers all the phases necessary for the acquisition, processing, and use of the spatial information necessary for emergency interventions in the case of flooding, simulation, and forecasting of floods.  
This study does not aim to replace other methods of conducting inundation studies, but to complement them with a new approach, considering the fact that each of the alternative methods also presents disadvantages that will be further discussed in the Section 4.  
On the other hand, the importance of this study also derives from the studied area, which presents particularities related to a location in the proximity of a large city, in an extremely inhabited area--the new urban area--on the bank of a river with a considerable flood potential. The study area around the dam on the Somes River was chosen because this area represents the most sensitive and interesting study area along the Somes River, due to the potential for direct and immediate impact on a vast number of inhabitants (over 55,000).  
To complete this workflow and create a complete methodology, the following stages were necessary:  
* Establishing a network of ground control points (GCP).
* Obtaining details from the field.
* Achievement of an orthophoto plane with the help of a drone.
* Creation of a digital topographical plan.
* Completing the necessary documentation.  
A significant study area was chosen that is located in the town of Floresti in Cluj County. The area is located in the vicinity of the second largest city in Romania (Cluj-Napoca), which in recent years has seen intensive urban development and reaches a commune with the largest number of inhabitants in Romania.  
As a result, the interest in this study has increased in recent years due to the increasingly aggressive weather phenomena, with their frequency having possible destructive effects and increasing the risk level on constructions as well as residential houses in the studied area. Rainfall has been a major problem over the years, leading to imminent disasters; this is precisely what is sought to be prevented by conducting this follow-up study. The impact and risk on an upward slope, present on the surrounding sites of the Somes River because of the increase in its water flow, were simulated in this work.