Any project, plan, or program, whether public or private, implemented in a geographical space must comply with a legal framework. This legal framework varies over time for various reasons. However, it primarily varies depending on the regulations governing its use or exploitation, whether urban planning, environmental, or topical. Natural risk as an element for decision-making isn`t selected as a disruptive factor for the implementation of any productive activity. The legal framework, as a transparent layer for achieving sustainable development, must provide objective instruments that lead to harmonious development in the geographic area where any human activity is to be implemented. The communication details the need to articulate the mandatory procedural legal elements so that the natural risk of a given geographic area is a key element for decision-making by any public or private actor. The case study focuses on the operational work of hydrological risk in small watersheds around Aragón, contrasting and analyzing existing work methodologies and legislation to detail which guidelines and recommendations should be incorporated into the current legal framework to prevent residential, secondary, or tertiary uses of the territory from being implemented in areas threatened by public safety in the face of a known natural risk.