The National Flood Zone Mapping System, also called SNCZI, is a tool that allows you to view the delimitation studies of public hydraulic domain and the mapping studies of flood zones prepared by the Ministry of Agriculture, Fisheries and Food; the Ministry of Ecological Transition; and the respective ministries of the governments of the different autonomous communities of Spain.

Directive 2007/60/EC of the European Parliament[1]​ and of the Council of October 23 regarding the assessment and management of flood risks, establishes the obligation of each Member State to prepare hazard maps and risk maps of the geographical areas that could be flooded according to the following scenarios:[2]​.

In addition to the aforementioned scenarios, article 6 of said directive indicates the elements that must be indicated in the hazard maps:.

On the contrary, risk maps should indicate the potential adverse consequences associated with flooding in the scenarios already mentioned:

The directive was transposed into Spanish legislation through Royal Decree 903/2010 of July 9 regarding the evaluation and management of flood risks, dedicating chapter III to hazard and risk maps, describing the following aspects:[3][4]​.

The hazard and risk map services included in the “Areas of

Potential Significant Flood Risk”, and their links to their respective

descriptive documents are the following:[5]​.